Copyright: ® Nathan Moffet


Help Contents
Contents

Classic S help file

August 1994 Revisions

Intel Product Update Bulletin (iPUB)

Board Product History

Bios History

Orderable Spare Parts

General Product Information

CMOS Setup Usage

Approved SIMM list

Approved Video DRAM

Approved SRAM list

Known Errata

Technical Product Summary

Introduction

Board Features

System Level Features

Appendix Information


August 1994 Revisions

•  Edited CMOS settings to match BIOS version 1.00.08.W0


Board Product History

As of June 15, 1994
Current PBA Numbers	CPU	Current Shipping BIOS
518725-013	i486SX-20	1.00 08.W0
518726-016	i486SX-20	1.00 08.W0
518726-013	i486SX-25	1.00 08.W0
518726-016	i486SX-25	1.00 08.W0
611418-006	i486SX-33	1.00 08.W0
518727-013	i486DX-33	1.00 08.W0
518727-016	i486DX-33	1.00 08.W0
611018-007	i486DX2-66	1.00 08.W0
Related Topics:

Engineering Change Orders

Board Revision History


 Engineering Change Orders

Riser Card

Chassis

System


Riser Card

Rev. 3.0:

No ECO;  Implemented 4/15 - 5/20, 1992

Two layer prototype riser card.  Used on pre-production systems only.  Used in 70 pre-production units.

Rev. 4.0:

No ECO;  Implemented 5/21 - 6/05, 1992

Four layer riser card.  Used in first 556 production units.

Rev. 4.5/Rev. A:

No ECO;  Implemented 6/08/93 - present

Buried a blue wire present on the Rev. 4.0 riser card.  Added a stub on riser card to ensure the card is not inserted backwards.  Rev. 4.5 also corrected a manufacturing problem, which caused some riser cards to short to the motherboard when using the Rev. 4.0.  This failure occured only during the manufacturing process.  No Rev. 4.0 cards were shipped that could cause damage in a customer application.  Rev. 4.5 and Rev. A are the same riser card.

Rev. 4.5/Rev. B/C/D:

No ECO;  Implemented

Modified the riser card to widen the disk drive cable cut out to accomodate multiple I/O cables through the slot.


Chassis

Changing Screw Size -- Class III

ECO 1134;  Implemented September, 1992

Changing size of screws used to fasten the power supply.  Classic will be using a common size screw to improve the manufacturing process.

Back Panel Label -- Class II

ECO 1146;  Implemented November, 1992

Adding a back panel label to cover up the spot welds and unfinished metal appearance of  the current systems.  The label matches the chassis color and provides a more finished look to the back panel.  The back panel label also includes the labeling for all the I/O ports on the panel.


Intel Product Update Bulletin (iPUB) - Engineering Change Orders - System
System

NEMKO, DEMKO, SEMKO certification -- Class II

ECO 1133;  Implemented October, 1992

Adding a new Classic safety label to include additional agency markings for Norway, Sweden and Finland.   The new markings indicate NEMKO, SEMKO and SETI safety compliance.  The label part number will change from 518750-001 to 518750-002 and label 518751-001 changes to 518751-002.

New Power Supply -- Class I

ECO 1145;  Implemented 1/93 Oregon; 11/92 Ireland

The power supply vendor, Astec, is discontinuing the current Classic power supply. Astec is replacing it with a new power supply identical in functionality. The power supply part number increments from 201850-001 to 201850-002.  The Classic chassis assembly increments from 518744-002 to 518744-003.

Increased Floppy Cable Length -- Class II

ECO 1135;   Implemented 1/93

Increasing the length of the floppy cable to accommodate the various floppy drive manufacturers.  The current floppy cable length is too short for use with certain floppy drive manufacturers.  The cable part number will change from 518761-002 to 518761-003.

New Video Diskettes -- Class I

ECO SW00211;   Implemented 2/93

Western Digital 4.2 video device drivers are now available. The existing 4.1 drivers 611260-001 and 610954-001 will be replaced with the new 4.2 video drivers 612466-001 and 612467-001. The 4.2 drivers provide higher performance running under Windows 3.1.  The ECO affects all country kits.

New Battery Available -- Class I

ECO 1202;   Implemented: 4/93

Switching to a lower cost 4.5 VDC battery.  The part number changes from 519617-001 to 202063-001.

Shipping Container Modification -- Class II

ECO1285;   Current Implementation Date: 6/93 Oregon; 6/93 Ireland

Modifies the multi-pack container to lessen the possibility of damage to motherboards during shipment.

Country Kit Packaging Modification -- Class II

ECO SW00231;   Current Implementation Date: 6/93 Oregon; 6/93 Ireland

Modifies the country kit packaging to use a jiffy-bag to store the manual, floppy diskettes and power cord.  The jiffy-bag #5 (469322-001) replaces the base cardboard pad (517323-002) and shrink wrap.  In addition, the ECO includes a new addendum (614037-001) to the Product Guide (469281-001).

Country Kit	Product Code	Old Part#	New Part#	Description
U.S.	S486USR1.0	469428-006	469428-007
U.S.	S486SXUSR1.0	469535-006	469535-007	No power cord
Europe	S486EURR1.0	469444-006	469444-007
U.K.	S486UKR1.0	610295-001	610295-002
Germany	S486DEUR1.0	610296-002	610296-003
France	S486FRAR1.0	610298-002	610298-003
Spain	S486ESPR1.0	610303-002	610303-003
Italy	S486ITAR1.0	610304-002	610304-003
This chart dates June, 1993


Board Revision History

Pre-Production Engineering Sample Board.

OPD produced several dozen engineering evaluation pre-production Classic S-series baseboards.  The pre-production board does not have a PBA number and the serial number label is yellow.  All production baseboards contain a PBA number and a white serial number label.  Pre-production boards should not be used as evaluation units for customers and should be returned to IntelTechDirect, M/S HF3-46, ATTN:  D.C., 5200 NE Elam Young Parkway, Hillsboro, OR, 97124.  IntelTechDirect will not provide support for any pre-production Classic S-series products.

PBA	System Processor	Current BIOS	Introduction Date
518725	i486SX-20 CPU	1.00 05 W0	June, 1992
518726	i486SX-25 CPU	1.00 05 W0	June, 1992
518727	i486DX-33 CPU	1.00 05 W0	June, 1992
611018	i486DX2-66 CPU	1.00 05 W0	October, 1992
611418	i486SX-33 CPU	1.00 05 W0	November, 1992
All Classic products ship with 1 4MB 80 ns 36-bit SIMM and 512 KB of video DRAM.

Related Topics:

PBA   51872X-001

PBA_51872X-002

PBA _51872X-003/004 611018-001

PBA _51872X-005/006  611018-002 611048-001

PBA _51872X-007/008  611018-003  611048-002

PBA _51872X-009/010  611018-004 611048-003

PBA _51872X-011/012  611018-005 611048-004

PBA _51872X-013/014  611018-006 611048-005

PBA _51872X-013/016  611018-007 611048-006


PBA   51872X-001

  Effective June, 1992

Printed Board Assembly Drawing:	Schematic Number:
518989	518987
The first Classic S-Series Microcomputer version released into manufacturing and fully supported by  IntelTechDirect.

Additional Information:

See the Classic S-Series General Information Section in iPUB for information regarding BIOS upgrades, memory upgrades, secondary cache upgrades and processor upgrades.

The Classic S-series solders the pre-programmed 8242PC keyboard controller directly to the motherboard.  Therefore, unlike previous OPD products, the keyboard controller is not user upgradeable.


PBA	51872X-002

Effective July, 1992

Revision -002 is functionally equivalent to revision -001.  Revision -002 buries a blue wire present on the -001 revision.  Added polyfuses on the keyboard and mouse lines.  The poly fuses regenerate after the fuse has blown, eliminating the need to replace the fuse.  No other differences exist between the two revision levels.


PBA 	51872X-003/004 611018-001

 Effective August, 1992

Printed Board Assembly Drawing:	Schematic Number:
518989	540122
The new revision levels correct two issues that surfaced requiring the removal of a capacitor and the addition of a resistor.

o	VIDEO GHOSTING

Removed a capacitor at C58 to eliminate a video image ghosting problem associated with the RAMDAC on Classic.  Especially noticeable while using Windows 3.0 or 3.1 with dark screen backgrounds, a ghost image appeared of the dialog or Windows boxes prior to removal of the capacitor.

o	NOVELL NETWARE PARITY ERRORS

Added a pull-up resistor at U32 from pins 9 to 14 to prevent random parity errors, which occurred while running Novell Netware386.

NOTE FOR PBAs 51872X:

Revision levels -003 and -004 are functionally equivalent.  The two revision levels represent product upgrades from -001 to -003 and -002 to -004 respectively.  Remember, that -001 and -002 are functionally equivalent.  The split revision levels -001/002 and -003/004 are a temporary event only.  All production systems produced after mid-August will ship with the -004 revision level and earlier revision levels will not be produced.

Revision level 51872X-001 may be reworked to a -003 level.  Revision level -002 may be reworked to a -004 level.


PBA 	51872X-005/006  611018-002 611048-001

Effective September, 1992

This revision replaces the N8242PC pre-programmed keyboard controller with a 8742 programmable keyboard controller to fix a problem occurring with VQC PS/2 style mice.  The keyboard controller runs at 12 MHz, but the microcode was written to function at 10 MHz.  The 8742 replaces the pre-programmed 8242 part until a new updated 8242 part is available.  Consequently, the VQC mouse fails to function correctly on the Classic system.  In addition, some trackball style mouse devices may not function correctly with -004 or eariler revisions.


PBA 	51872X-007/008  611018-003  611048-002

Effective November 1992

An emergency ECO occurred to change the resistor value of R146 to 33 ohms.  The new resistor value fixes a keyboard failure message occuring during the manufacturing test process.  No systems were shipped exhibiting the keyboard failure message.


PBA 	51872X-009/010  611018-004 611048-003

Effective December, 1992

Modifies the video RC and LC filter circuits to remove slight blurring of the video display especially at higher  resolutions.  Modifications include the addition of a new resistor and new values for capicitors C48, C49, C50, C55, C56, C57  and inductors L6, L7, L8 within the video output filtering circuitry.


PBA 	51872X-011/012  611018-005 611048-004

Effective February, 1993

A revised motherboard will incorporate the WD90C31 F-step video controller, a new video RAMDAC and will ship with 512KB of video DRAM as opposed to the current 1MB. In addition, the new revision will use pre-programmed PALS to reduce manufacturing fallout and ship with 60ns video DRAM instead of the 70ns parts currently in use. The new Winbond RAMDAC does not replace the previous part, but instead serves as an alternate, depending upon availability. Classic originally shipped with 1MB of video DRAM to mask a WD90C31 C-step video errata. The F-step part corrects the errata and it is no longer necessary to ship with a full 1MB of video DRAM. The F-step part also corrects a temperature-related errata. At cold temperatures, typically during the first two minutes of operation, the earlier revisions of the 90C31 sometimes produced a scrambled video signal. The display when running Windows appeared illegible. The problem disappears once the part reaches its operating temperature. Typically, Classic system users will not see the errata. The F-step 90C31 corrects the issue.

Component	Intel Part Number
Western Digital 90C31	201711-500  F stepping
Video DRAM	108774-370  replaced with 60 ns parts (4 parts)
VDAC	201496-202
PAL	107001-202
PAL	107006-206
PAL	108016-202
PAL	106977-203
PAL	107001-203


PBA 	51872X-013/014  611018-006 611048-005

Effective March, 1993

A revised motherboard will incorporate the B-stepping of the OPTi 82C495 system controller chip.  In addition, manufacturing will begin using the pre-programmed 8242 keyboard controller again, but the 8742 controller will continue to serve as an alternate. Originally, the ECO intended to also incorporate the B-step OPTi 82C392 chip as well.  OPTi decided to cancel the B-step 82C392, necessitating exclusion of the part from this ECO. As part of the ECO, 70ns SIMMs have been qualified for operation in the Classic S-Series. Previously, only 80ns SIMMs had been qualified. Please consult the iPUB memory section for a complete listing of all SIMMs qualified for operation in the Classic S-Series.

Component	Intel Part Number
OPTi 82C495	201781-502 B stepping


PBA 	51872X-013/016  611018-007 611048-006

Effective June, 1993

ECO1296

Modified the mother board to improve grounding.

CPU	Old PBA#	New PBA#
i486SX-20	518725-013	No Change
i486SX-20	518725-014	518725-016
i486SX-25	518726-013	No Change
i486SX-25	518726-014	518726-016
i486SX-33	611418-005	611418-006
i486DX-33	518727-013	No Change
i486DX-33	518727-014	518727-016
i486DX2-66	611018-006	611018-007


Bios History

BIOS version V1.00 08.W0

BIOS version V1.00 07.W0

BIOS version V1.00 06.W0

BIOS version V1.00 05.W0

BIOS version V1.00 04.W0

BIOS version V1.00 03.W0

BIOS version V1.00 02.W0

BIOS version V1.00 01.W0

Parallel Port


BIOS version V1.00 08.W0

BIOS version 1.00.08.W0 adds a new option to support a third I/O address (3BC) for the parallel port.  Previous versions supported only two parallel port I/O addresses (278H and 378H).  This port addition was implemented to accommodate a request from customers.  A POST routine has also been added to remove a slight statistical chance of a false real time clock failure.


BIOS version V1.00 07.W0

BIOS version 1.00.08.W0 adds a new option to support a third I/O address (3BC) for the parallel port.  Previous versions supported only two parallel port I/O addresses (278H and 378H).  This port addition was implemented to accommodate a request from customers.


BIOS version V1.00 06.W0

Issues Resolved in this release:

Features added or changed in this release:


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 06.W0 - Issues Resolved in this release:
Issues Resolved in this release:

Corrects BIOS error message "130: Diskette Drive Failure" that displayed when a system was configured as shown below:

Floppy Diskette A:	Not Installed

Floppy Diskette B:	Not Installed

Onboard Floppy Controller: Disabled

The system now properly supports a configuration with no floppies installed and the onboard floppy controller disabled.  Note:  Prior notifications indicated the "130: Diskette Drive Failure" correction would be included in the 1.00 05.W0 BIOS.   Please disregard earlier notifications regarding this fix.

Correctly allows a no floppy, no hard disk configuration.

Cleaned up ISA/Setup messages if error occured with CMOS.

Disabled INT 15 function to update drive table in Flash and enabled INT 15 speaker control.

Removed code that determines what A20 handler to use (fast or keyboard).  This fixes a HIMEM 3.07 or higher problem on the Classic S playform.  The BIOS always uses fast.

Correctly supports add-in serial boards configured to use COM3 or COM4.

Correctly sets bit 3 in register 25 of the OPTI chipset DRAM control register II to enable fast decode enable to speed up DRAM access when using an i486DX2 or OverDrive processor.


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 06.W0 - Features added or changed in this release:
Features added or changed in this release:

Uses the new Western Digital 90C31 5.18 video BIOS.

Removes the enable/disable 512K to 640K feature within the BIOS setup.  THe OPTI chipset does not support this feature.


BIOS version V1.00 05.W0

Issues Resolved in this release:

Features added or changed in this release:

Important Notice!


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 05.W0 - Issues Resolved in this release:
Issues Resolved in this release:

Corrects a condition during reset of the system that caused a complete clearing of CMOS settings and a return to default conditions.  Typically, the failure appeared as a keyboard controller failure with a beep code of 3-2-4.

Corrects a condition during POST that buffered spacebar keyboard inputs.  The buffered spacebar keyboard inputs could result in an incorrect time-of-day clock displayed in CMOS setup.  The usual failure scenario involves hitting space bar to discontinue the POST memory test.  Any subsequent spacebars incremented the time-of-day clock by one hour.

Correctly shadows drive types 48 and 49 to drive types 2 and 3.  Novell does not recognize drive types 48 and 49.  BIOSes prior to 1.00 05 W0 would not support Novell systems attempting to use drive types 48 and 49, because the shadowing feature to types 2 and 3 did not work correctly.


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 05.W0 - Features added or changed in this release:
Features added or changed in this release:

Provides an option to hide the "130:  To continue press: ... SPACEBAR; Ton configure system press: ... F1" message during POST.  The default setting hides the message to prevent unwanted access into the CMOS setup area.  Users may still enter the CMOS setup area when the POST countdown reaches 135.  The 135 number is highlighted in white and the system pauses for several seconds.  While the system pauses at 135 the user may type F1 to enter the CMOS setup area or type spacebar to continue with the boot process.  Within CMOS setup a new option "POST Setup Prompt:" allows the user to either hide or display the setup message.


Important Notice!

Intel Manufacturing recently discovered that some S-Series systems shipped with an incorrect version of the 1.00 05.W0 BIOS.   The correct version of the 1.00 05.W0 BIOS contains one additional fix:

Correctly shadows drive types 48 and 49 to drive types 2 and 3.  Novell does not recognize drive types 48 and 49.  BIOSes prior to 1.005 05.W0 would not support Novell systems attempting to use drive types 48 and 49, because the shadowing feature to types 2 and 3 did not work correctly.

A user may differentiate between the two BIOS versions by examining the date code of the BIOS files.  When using the FMUP utility, the incorrect BIOS displays a date of 11/23/92.  The correrct version of the BIOS displays a date of 12/15/92.  Additionally, the user may examine the BIOS in Flash memory with the DOS Debog utility.  At the Debug prompt, perform the following command: -d ffff:5.  The incorrect version displays a date prior to 12/01/92.  The correct version displays the date as 12/01/92.

The correct version of the 1.00 05.W0 BIOS is available from the iPAN Bulletin board.  The self-extracting file is 10005w0.exe.  Download the file, extract its contents onto a floppy diskette and perform a Flash BIOS update.


BIOS version V1.00 04.W0

This revision of the BIOS added new IMM factory test procedure to improve testing time.


BIOS version V1.00 03.W0

Issues Resolved in this release:

Features added or changed in this release:


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 03.W0 - Issues Resolved in this release:
Issues Resolved in this release:

This version of the BIOS changes the video mode initialization sequence to eliminate a two second high frequencey video signal being sent to the monitor.  During CTRL-ALT-DEL the video BIOS cycles through all the video modes and stays in the last high frequency mode for several seconds during the reboot process.  The 1.00 03 W0 BIOS prevents damage to monitors by eliminating the two second high frequency interval.


Intel Product Update Bulletin (iPUB) - BIOS version V1.00 03.W0 - Features added or changed in this release:
Features added or changed in this release:

BIOS V1.00 03.W0 changes the default setting for the parallel port interrupt in CMOS setup from disabled to enabled.

BIOS V1.00 03.W0 also has enhancements that were included to improve factory manufacturing testing time.


BIOS version V1.00 02.W0

This BIOS reverses the order of the POST test allowing  initialization of the parallel port before testing the port.   The incorrect order in the previous BIOS (V1.00 01.W0) caused the parallel port to fail.  The parallel port is driven by an asynchronous state machine.  Without proper initialization, the parallel port has a random chance of coming up in the correct mode.  Therefore, the problem manifests itself only on some Classic S-series systems with the 1.00 01 W0 BIOS.


BIOS version V1.00 01.W0

Initial production release of the Classic S series BIOS.


Parallel Port

Parallel Port option in the ROM Based SETUP utility provides additional options not present on previous OPD products.

Parallel Port Options

Disabled

Base Address 378H:	Compatible

Base Address 278H:	Compatible

Base Address 378H:	Bi-directional

Base Address 278H:	Bi-directional

Compatible refers to AT compatible.  Bi-directional refers to PS/2 compatible.

The logical parallel port names (LPT1, LPT2) are assigned based on the number of parallel ports in the system and the I/O addresses (3BCH, 378H, 278H) used by each port.  If a monochrome card containing a parallel port is installed in the system, its I/O address will be 3BCH and its logical name will be LPT1.  The onboard parallel port will have the I/O address referenced in the Parallel Port entry in the ROM Based SETUP program and its logical name will be LPT2.  Another situation is if another type of add-in board containing a configurable parallel port is installed in the system.  Its I/O address options will be 378H or 278H.  It is important to make sure the I/O address for the add-in board differs from the I/O address for the onboard parallel port.  The port that is assigned I/O address 378H will have the logical name LPT1.  The other parallel port (278H) will be LPT2.  If there is no add-in board containing a parallel port installed in the system, the onboard parallel port will have the I/O address referenced in the parallel port entry in the ROM Based SETUP and its logical name will be LPT1.


Orderable Spare Parts

Motherboard

System

SPARES PARTS KITS


Motherboard

June, 1994

PART NUMBER	DESCRIPTION

518726-016	Motherboard, i486SX, 25Mhz, 4MB
518727-016	Motherboard , i486DX, 33Mhz, 4MB
611018-006	Motherboard , i486DX2, 66 Mhz (internal clock speed), 4MB
611418-005	Motherboard , i486SX, 33 Mhz, 4MB
519200-001	RISER CARD
202063-001	4.5 V Ray-O-Vac battery


Intel Product Update Bulletin (iPUB) - Orderable Spare Parts - System
System

PART NUMBER	DESCRIPTION

614703-001	SA145-3408    ASTEC   145 WATT ASTEC POWER SUPPLY
455114-003	FD-235HF-4291 TEAC    3.5" TEAC FLOPPY DRIVE
108520-001	POWER CORD, 125 V., 6 ft.
518761-002	FOXCONN CABLE ASSEMBLY, FLOPPY
519148-001	FOXCONN CABLE ASSEMBLY, HARD DISK
519146-001	CYCLONE CHASSIS ASSEMBLY
519167-001	CHASSIS BOTTOM
519168-001	CHASSIS TOP COVER
519169-001	CHASSIS FRONT BEZEL ASSEMBLY
519493-001	FILLER PANEL 5 1/4" TOP
519773-001	FILLER PANEL 5 1/4" BOTTOM
519494-001	FILLER PANEL KIT 3.5"
519174-001	3.5" DRIVE BRACKET
519173-001	3.5" FRONT PANEL FILLER
519175-001	CONTROL PANEL CABLE ASSEMBLY
519495-001	BUTTON KIT
519496-001	MASTER KEY
519619-001	I/O SHIELD
519620-001	SWITCH COVER


SPARES PARTS KITS

Spares Part Kit for the S486SX25

Spares Part Kit for the S486DX33


      Spares Part Kit for the S486SX25

      Nova Code: ClCSX25SPRKT01

                        QTY

518726-00x         3      Mother Brd, i486SX, 25Mhz, 4MB

201850-00x         4      Power Supply, 145 Watt, Astec

518761-00x         1      Cable Assembly, Floppy, Foxconn

519148-00x         1      Cable Assembly, Hard Disk

519494-00x         1      Filler Panel Kit, 3.5"


      Spares Part Kit for the S486DX33

      Nova Code: CLCDX33SPRKT01

                        QTY

518727-00x         3     Mother Brd, i486DX, 33Mhz, 4MB

201850-00x         4     Power Supply, 145 Watt, Astec

518761-00x         1     Cable Assembly, Floppy, Foxconn

519148-00x         1     Cable Assembly, Hard Disk

519494-00x         1     Filler Panel Kit, 3.5"


CMOS Setup Usage

Setup Page 1

Setup Page 2

Setup Page 3

Setup Page 4


Setup Page 1

Choice	Default Settings	Comments
System Time	Current time	Can also change from DOS
System Date	Current date	Can also change from DOS
Onboard Floppy	Enabled
Diskette A	3 1/2-inch, 1.44 MB
Diskette B	Not Installed
Onboard IDE	Disabled
Hard Disk 1	Not Installed
Hard Disk 2	Not Installed
User Definable Drives	48 and 49
Boot Device	Floppy or Hard Drive
POST Setup Prompt	Enabled


Setup Page 2

Choice	Default Settings	Comments
Video Card	VGA/EGA	Display mode
800x600 Mode Refresh Rate	56 Hz	Must power down system if this is edited.
1024x768 Mode Refresh Rate	Interlaced @ 44/88 Hz	Must power down system if this is edited.
Onboard Video Controller	Primary
Keyboard	Not Installed
Numlock On at Boot	No
Password	Not Installed	Press + or - to enter
Scan FLASH User Area	Disabled


Setup Page 3

Choice	Default Settings	Comments
Base Memory	Set by system	Display only
Extended Memory	Set by system	Display only
Speaker	Enabled
Onboard Mouse	Enabled
Parallel Port	Base Address 378H: Compatible
Parallel Port Interrupt	Enabled	Disable for polled mode
Serial Port 1	Enabled
Serial Port 2	Enabled
Console Redir/Serial Port 1	Disabled
Console Redir/ Serial Port 2	Disabled


Setup Page 4

Choice	CMOS Clear Default	Comments
CPU Speed	Fast
Cache	Enabled	Optimum performance
Onboard Video Bios Mapping	To E0000H
Shadow C0000H to C3FFFH	Disabled
Shadow C4000H to C7FFFH	Disabled
Shadow C8000H to CBFFFH	Disabled
Shadow CC000H to CFFFFH	Disabled
Shadow D0000H to D3FFFH	Disabled
Shadow D4000H to D7FFFH	Disabled
Shadow D8000H to DBFFFH	Disabled
Shadow DC000H to DFFFFH	Disabled


Approved SIMM list

The following tables list SIMMs that are known to be compatible with the Classic S. SIMMs that are not listed also should function properly as long as their specifications are compatible with the devices listed below. In general, SIMM devices that are faster than those specified for a given platform will work although no extra performance will be realized.  The SIMM devices shown are categorized according to two levels of qualification:

1. Intel Qualified:  The device has been electrically tested by Intel and is known to be compatible with the Classic S.

2. Customer Qualified: The device has been electrically tested by a customer and is reported to be compatible with the specified platform(s).

Intel recommends that SIMMs listed as (1) Intel Qualified be used to ensure reliable system operation. SIMMs not listed or listed as (2) Customer Qualified can be used; but, in the event of unreliable system operation, the SIMMs should be replaced with SIMMs tested by Intel (1) to determine whether the SIMMs are causing the problem.

IMPORTANT NOTE

SIMM devices with gold contacts should NOT be placed into SIMM sockets with tin-lead contacts or vice-versa. The Classic S has tin-lead contacts, therefore gold contact SIMM devices should NOT be used. For more information, see FaxBack document 4229.

Related Topics:

256K x 9, FP, Tin-lead contacts

1M x 9, FP, Tin-lead contacts

4M x 9, FP, Tin-lead contacts

256K X 36 (1MB per SIMM) Tin Lead Contacts

512K X 36 (2MB per SIMM) Tin Lead Contacts

1M X 36 (4MB per SIMM) Tin-Lead Contacts

2M X 36 (8MB per SIMM) Tin-Lead Contacts


256K x 9, FP, Tin-lead contacts

Manufacturer	Part Number	Comments
NMB Corporation	MM2801J9S08	Intel Qualified.
NMB Corporation	MM2801J9S07	Intel Qualified.
NMB Corporation	MM2801J9S06	Intel Qualified.
Toshiba	THM92500AS-80	Intel Qualified.


1M x 9, FP, Tin-lead contacts

Manufacturer	Part Number	Configuration	Comments
Fujitsu LTD.	MB85305-80PS	3 Chip SIMMs	Intel Qualified.
Fujitsu LTD.	MB85305-70PS	3 Chip SIMMs	Intel Qualified.
Intel Corp.	ISM001DR09L-70	3 Chip SIMMs	Intel Qualified.
NEC Electronics, Inc.	MC421000A9BA-80	3 Chip SIMMs	Intel Qualified.
Samsung Corning Co.	KMM591000BN-8	3 Chip SIMMs	Intel Qualified.
Texas Instruments	TM124EU9B-80IN	3 Chip SIMMs	Intel Qualified.
Texas Instruments	TM124EU9B-70IN	3 Chip SIMMs	Intel Qualified.
Toshiba Corp.	THM91070AS-80	3 Chip SIMMs	Intel Qualified.
Fujitsu, LTD.	MB85235-80PS	9 Chip SIMMs	Intel Qualified.
Intel Corp.	TSM001DR09P-70	9 Chip SIMMs	Intel Qualified.
NEC Electronics, Inc	MC421000A9B-80	9 Chip SIMMs	Intel Qualified.
NEC Electronics, Inc	MC421000A9B70	9 Chip SIMMs	Intel Qualified.
Samsung Corning Co.	KMM591000B-8	9 Chip SIMMs	Intel Qualified.
Texas Instruments	TM024EAD9-80L	9 Chip SIMMs	Intel Qualified.
Toshiba Corp.	THM91000AS-80	9 Chip SIMMs	Intel Qualified.


4M x 9, FP, Tin-lead contacts

Manufacturer	Part Number	Comments
Texas Instruments	TM4100EAD9-80	Intel Qualified.
Texas Instruments	TM4100EAD9-70	Intel Qualified.
Samsung	KMM594000BQ-7	Intel Qualified.
Samsung	KMM594000B-7	Intel Qualified.
Micron Technology	MT9D49M-7	Intel Qualified.
Fujitsu Ltd.	MB85285A-70PS	Intel Qualified.
Samsung	KMM594000B-8	Intel Qualified.
Goldstar	GMM794000NS-80/70	Customer Qualified.
Hyundai	HYM594000AM-80/70	Customer Qualified.
Micron Technology	MT3D49-80/70	Customer Qualified.
Mitsubishi	MH4M09A0JA-8/7	Customer Qualified.
Motorola	MCM94000AS80/70	Customer Qualified.


256K X 36 (1MB per SIMM) Tin Lead Contacts

Manufacturer	Part Number	Comments
Samsung	KMM536256B-7	Intel Qualified.
Texas Instruments**	TM256KBK36B-70	Intel Qualified.
Texas Instruments**	TM256KBK36C-70	Intel Qualified.
Samsung	KMM536256B-8	Intel Qualified.
Texas Instruments**	TM256KBK36B-80	Intel Qualified.
Texas Instruments**	TM256KBK36C-80	Intel Qualified.
Toshiba Corp	THM362500AS-80	Intel Qualified.
Toshiba Corp	THM362500AS-70	Intel Qualified.


512K X 36 (2MB per SIMM) Tin Lead Contacts

Manufacturer	Part Number	Comments
Samsung	KMM536512C-7	Intel Qualified.
Texas Instruments**	TM512LBK36B-70	Intel Qualified.
NEC/World Products	MC-424512A36BA-80	Intel Qualified.
Samsung	KMM536512C-8	Intel Qualified.
Texas Instruments**	TM512LBK36B-80	Intel Qualified.
Toshiba Corp.	THM365120AS-80	Intel Qualified.
Toshiba Corp	THM365120AS-70	Intel Qualified.
Micron Technology	MT18D51236M-7	Customer Qualified.
Micron Technology	MT18D51236M-8	Customer Qualified.
Micron Technology	MT20D51236M-8	Customer Qualified.
Micron Technology	MT20D51236M-7	Customer Qualified.
** Must specify Tin-lead or Gold contacts material at time of order.


1M X 36 (4MB per SIMM) Tin-Lead Contacts

Manufacturer	Part Number	Comments
Samsung	KMM5361000A-7	Intel Qualified.
Texas Instruments**	TM124MBK36B-7	Intel Qualified.
Fujitsu LTD	MB85346-80PS	Intel Qualified.
NEC Electronics INC	MC-421000A36BE-80	Intel Qualified.
Samsung	KMM5361000B-8	Intel Qualified.
Toshiba Corp.	THM361020AS-80	Intel Qualified.
Texas Instruments**	TM124MBK36A-7	Intel Qualified.
Toshiba Corp.	THM361010AS-70	Intel Qualified.
Micron Technology	MT9D136M-7	Customer Qualified
Micron Technology	MT9D136M-8	Customer Qualified
Samsung	KMM5361000B-7	Customer Qualified
** Must specify Tin-lead or Gold contacts material at time of order.


2M X 36 (8MB per SIMM) Tin-Lead Contacts

Manufacturer	Part Number	Comments
Toshiba Corp.	THM362040AS-80	Intel Qualified.
Samsung	KMM5362000B1-7	Intel Qualified.
Toshiba Corp	THM362040AS-70	Intel Qualified.
Micron Technology	MT18D236M-7	Customer Qualified.
Micron Technology	MT18D236M-8	Customer Qualified.
Micron Technology	MT24D236M-8	Customer Qualified.
Samsung	KMM5362000A-8*	Customer Qualified.
Toshiba	THM362020S-80*	Customer Qualified.
Micron Technology	MT24D236M-7	Customer Qualified.
*Tall module (29 mm)


Approved Video DRAM

The Classic S-Series can be upgraded to 1MB of video DRAM by installing four 70ns 256Kx4 Page Mode DIP DRAM.  Below are several vendors and their part numbers.

Texas Instruments	TMS44C256-70N

Siemens	HYB514256B-70

Toshiba	TC514256AP-70

NEC	uPD424256


Approved SRAM list

The Classic S-Series can be upgraded with an external cache by adding SRAM components to DIP sockets on the baseboard.  The design requires 20 ns data SRAM and 15 ns tag and dirty bit SRAM.  Installation is as follows.  Refer to Appendix B for jumper settings.

Cache Size	SRAM Size
	Bank 0  U46-U49	Bank 1 U42-U45	Tag U50	Dirty Bit U51
64 K	(4) 8Kb x 8	(4) 8Kb x 8	(1) 8Kb x 8	(1) 64Kb x 1
128K	(4) 32Kb x 8	none	(1) 32Kb x 8	(1) 64Kb x 1
256K	(4) 32Kb x 8	(4) 32Kb x 8	(1) 32Kb x 8	(1) 64Kb x 1
The list below details the part numbers for a 64K, 128K, or 256K cache from several different vendors.

Device Type	Motorola	Cypress	IDT	Samsung	Mitsubishi
8 Kb x 8, 15 ns	MEM6264PC15	CY7C185-15PC	7164S15TP	KM68685BP-15	N/A
8 Kb x 8, 20 ns	MEM6264PC20	CY7C185-20PC	7164S20TP	KM68685BP-20	N/A
32 Kb x 8, 15 ns	MEM6206PC15	CY7C199-15PC	71256S15TP	KM68257BP-20	N/A
32 Kb x 8, 20 ns	MEM6206PC15	CY7C199-20PC	71256S20TP	KM68257BP-20	N/A
64 Kb x 1, 15 ns	MEM6287P15	CT7C187A-15PC	7187S15P	N/A	M5M5187BP-15


Known Errata

Video Ghosting

Novell Netware Parity Errors

Replaced Keyboard Controller

Additional Information:


Video Ghosting

Removed a capacitor at C58 to eliminate a video image ghosting problem associated with the RAMDAC on the Classic S.  Especially noticeable while using Windows 3.0 or 3.1 with dark screen backgrounds, a ghost image of the dialog or Windows boxes would appear prior to removal of the capacitor.

This was fixed with Motherboard PBA numbers 518726-003/004 and 518727-003/004.


Novell Netware Parity Errors

Added a pull-up resistor at U32 from pins 9 to 14 to prevent random parity errors, which occurred while running Novell Netware386.

This was fixed with Motherboard PBA numbers 518726-003/004 and 518727-003/004.


Replaced Keyboard Controller

This revision replaces the N8242PC pre-programmed keyboard controller with a 8742 programmable keyboard controller to fix a problem occurring with VQC PS/2 style mice.  The keyboard controller runs at 12 MHz, but the microcode was written to function at 10 MHz.  The 8742 replaces the pre-programmed 8242 part until a new updated 8242 part is available.  Consequently, the VQC mouse fails to function correctly on the Classic system.  In addition, some trackball style mouse devices may not function correctly with -004 or eariler revisions.


Additional Information:

See the Classic S-Series General Information Section in iPUB for information regarding BIOS upgrades, memory upgrades, secondary cache upgrades and processor upgrades.

The Classic S-series solders the pre-programmed 8242PC keyboard controller directly to the motherboard.  Therefore, unlike previous OPD products, the keyboard controller is not user upgradeable.


Introduction

IntelTM486 Classic S-Series incorporates a high performance SuperVGA solution in an affordable i486 platform.  A wide range of i486TM CPU offerings gives performance flexibility to start and the OverDriveTM  Processor Socket gives a future path to higher performance.  An LPX form factor system design with video, hard disk, floppy control, mouse, and other I/O ports integrated, as well as five slots and 4 bays provides the expandability needed for traditional desktop PC applications.

The onboard Western Digital 90C31 SuperVGA controller gives solid performance for VGA applications and superior Windows performance, even at the maximum resolution of 1024 X 768 X 256 colors.  This performance is attained via hardware built into the 90C31 which accelerates the most essential Windows graphics functions.

An easy upgrade path to higher CPU performance is built into S-Series.  The OverDriveTM  Processor Socket allows installation of either an i487TMSX to provide power for numeric intensive applications, or an OverDriveTM Processor, Intel's clock doubling upgrade processor, to significantly improve CPU performance.


Board Features

General Board Layout

CPU

Performance Upgrade

Optional Cache

Phoenix Technologies System BIOS

Video Subsystem

Keyboard Controller

System Memory

Opti Chipset

Real Time Clock, Battery-backed CMOS RAM, and Battery

National PC87310 (SuperI/O)

Speaker

LPX Form Factor


General Board Layout

A. VGA video Connector (J1)

B.  Parallel Connector (J2)

C.  Serial Port 1 Connector (J3)

D.  Serial Port 2 Connector (J4)

E.  Mouse Connector (J5)

F.  Keyboard Connector (J6)

G.  Offboard Batter Header (J7)

H. Auxilliary Fan Power Header (J11)

I. Power Connector (J10,J15)

J.  3 ½ - inch Floppy Disk Drive Header (J18)

K. IDE Disk Drive Header (J17)

L. ISA Riser Card Connector (J8)

M. Front Panel Reset Switch Header (J24)

N.  Front Panel Keyboard Lock Switch/Power LED Header (J23)

O.  Hard Disk Activity LED Header (J22)

P. VESA - Compliant 8514/A Standard Feature Header (J12)


CPU

IntelTM486 Classic S-Series provides several different base CPU options; an i486TMSX running at 20, or 25 MHz or an i486DX at 33 MHz.  This provides a wide price/performance range to fit a variety of customer application needs.

The S-Series supports complete i486 CPU functionality.  Common features of the three CPUs include backward compatibility with the 8086, 80286,  and i386TM CPUs, burst mode bus cycles, and an on-chip 8 Kbyte cache.  The cache is 4-way set associative and uses a write-through policy, and can be disabled via software.  The i486DX CPU contains an on-chip numeric coprocessor to increase the speed of floating point operations.  This coprocessor is backward code compatible with 387DX and 387SX math coprocessors and complies to ANSI/IEEE standard 754-1985. The i486SX does not include the numeric coprocessor.


Performance Upgrade

Upgrades to higher performance are easy using the Performance Enhancement Socket incorporated into Classic.  An i487SX can be added to any of the i486SX systems to provide improved floating point performance.  The S-Series can also be upgraded with an OverDrive Processor, providing significantly higher CPU performance and numerics capability for i486 systems.  For specific details concerning the upgrade process, refer to Appendix G.


Optional Cache

An optional cache is designed into Classic.   The Opti chipset includes a direct mapped, write back cache controller, while DIP sockets for SRAM installation on the motherboard support either 64K , 128K, or 256K of cache SRAM.  For SRAM vendors and installation details, refer to Appendices B and E.


Phoenix Technologies System BIOS

The S-Series uses Phoenix Technologies BIOS which provides for ISA compatibility.  This BIOS, along with the Western Digital Video BIOS, is incorporated into an Intel 28F001B 1 Mbit FLASH EEPROM device to facilitate easy BIOS upgrades. Upgrading BIOS is as simple as running a utility via the floppy drive.  BIOS upgrades will be available for download on iPAN.  For details on IntelTechDirect, refer to Appendix N.  S-Series will support video and system BIOS shadowing, allowing for the execution of any BIOS routines out of fast 32-bit onboard DRAM memory instead of the slower 8-bit FLASH device.

Related Topics:

Flash Implementation

Upgrade Utility

Setup


Flash Implementation

The Intel 28F001B 1 Mbit FLASH component is organized as 128Kbit X 8 (128 KByte).  The Flash device is divided into five areas, as described in Table 1.

System Address	FLASH Memory Area
FFFFFH	64KB Main BIOS
F0000H
EFFFFH	8KB Boot Block (Not FLASH eraseable)
EE000H
EDFFFH	4KB Parameter Block (User available)
ED000H
ECFFFH	4KB Parameter Block (BIOS Only)
EC000H
EBFFFH	48KB BIOS Extensions (System and Video)
E0000H
___________________________________________________________________________

Table 1: Flash Memory Layout

The FLASH device resides in system memory in two 64K segments starting at E0000H, and is distributed in two different organizations, depending on the mode of operation. In Normal Mode address line A16 is inverted, switching the E000H and F000H segments so that the BIOS is organized as shown in the system address column above.  Recovery mode removes the inversion on address line A16, swapping the E000H and F000H segments so that the 8KB boot block resides at FE000H where the 80486 expects the bootstrap loader to exist.  This mode is only necessary in the unlikely event that the BIOS upgrade procedure is interrupted, causing the BIOS area to be left in an unusable state.  For information on recovering the BIOS in the event of a catastrophic failure, refer to Appendix H.


Upgrade Utility

The floppy upgrade utility (FMUP.EXE) has three different options for BIOS upgrade purposes.  First, there is the capability to update the FLASH BIOS with a file on disk.  The second option copies the current BIOS code from the FLASH EEPROM to a disk file to allow the user a backup should there be reasons the upgrade can't be finished.  The final option compares the BIOS in the FLASH to a disk file to verify they are the same to insure the system has the correct BIOS version.  The utility is downloadable from iPAN.  Refer to Appendix N for details on IntelTechDirect  and iPAN.


Setup

IntelTM486 Classic S-Series incorporates many commonly used system setup features into the FLASH EEPROM. S-Series setup is only accessible during the power on self test.  A screen message prompts for the F1 key when setup is available, and gives the option to bypass the prompt by pressing the spacebar.  As soon as this prompt is gone, the system must be reset to enter setup.  ROM-based setup allows the system configuration to be modified without opening the system and changing jumpers for most basic configuration changes.  Setup options are detailed in Appendix C.


Video Subsystem

90C31 SuperVGA Controller

Western Digital Video BIOS

Video Connectors

Video Drivers and Utilities


90C31 SuperVGA Controller

A Western Digital 90C31 SuperVGA controller chip provides the superior VGA performance, as seen in previous Western Digital graphics controllers, and adds several Windows functions built into the hardware such as BitBLT operations, a hardware cursor and pattern fill capabilities.  These new functions yield dramatic increases in performance running Microsoft Windows, in some cases up to 20 times conventional SVGA implementations.

In traditional VGA solutions, graphics for Windows are processed by a driver which runs on the main system CPU.  With S-Series several key functions are processed directly by the 90C31, bypassing the 486 and the driver code.  Functions which are improved are BitBLTs and pattern fills.  BitBLT, short for Bit BLock Transfer, copies a section of screen pixels from one place to another.  The 90C31 speeds BitBLTs from screen memory to screen memory.  The 90C31 recognizes a pattern fill and after the first section is copied from the system memory to the screen memory, it performs screen-to-screen BitBLTs to fill the rest, bypassing the ISA bus.  The 90C31 also incorporates the cursor control in hardware, which frees the driver from cursor management, and provides a more stable cursor.

The video sub-system supports backward software compatibility with MDA, CGA, Hercules Graphics, EGA, and VGA video standards.  S-Series standard configuration includes 512 Kbytes of Video DRAM, allowing resolutions up to 1024 X 768 X 16 colors or 800 X 600 X 256 colors.    The video DRAM memory can be increased to a total of 1 Mbyte by adding four 256K x 4 fast page mode 70 ns DRAMs to the four DIP sockets on the system board at locations U15 - U18.  With 1 Mbyte of display RAM installed, the S-Series will support a maximum resolution of 1024 x 768 x 256 colors.  S-Series supports non-interlaced as well as interlaced monitors even at the higher resolutions.  The Display ram is paged into 128 Kbytes of RAM located between A0000H and BFFFFH.  Refer to Appendix E for Video DRAM vendors and installation procedures.


Western Digital Video BIOS

Video BIOS from Western Digital has been incorporated into the system BIOS.  The BIOS supports the normal VGA modes (0,1,2,3,4,5,6,7,D,E,F,10,11,12,13) and also supports several enhanced video modes.  To allow for the use of other addin video adapter cards, the onboard video can be disabled using a hardware jumper at location J28.  Detailed jumper information is available in Appendix B.


Video Connectors

A standard PS/2 15pin analog VGA connector is provided on the I/O back panel.  A VESA compliant 8514/A feature connector is also provided on the baseboard.  This is typically used as a VGA pass through connector when an auxiliary video sub-system is installed in one of the expansion slots, such as an 8514/A compatible video card or DVI board.


Video Drivers and Utilities

Video drivers and utilities for DOS are shipped with the  S-Series system.  Included on the diskettes are enhanced mode drivers for common MS-DOS software applications such as AutoCAD, AutoShade, Cadvance,  Generic Cadd, PCAD, VersaCAD, WordPerfect, WordStar, Ventura and Lotus 123 & Symphony.  These come in a compressed form and are extracted by using a utility called INSTALL.EXE located on the diskette.  Video drivers for Windows 3.0/3.1 can be installed by executing WDSETUP.EXE while running Windows.  Changes to the drivers and direction for use are included on each driver diskette in the file README.DOC.  Video drivers for SCO and Interactive UNIX should be obtained from the respective UNIX vendor.  Video drivers are also available via iPAN.  Refer to Appendix M.

The 90C31 is backward compatible with the 90C30 currently integrated in the Professional Workstation.  Drivers for applications other than Windows are interchangeable between the controllers and are currently available on iPAN under HARDWARE.CLASSIC.DEVICE DRIVERS.  Currently Windows is the only Graphical User Interface (GUI) which can take advantage of the built-in acceleration.  For a list of supported video modes, refer to Appendix L.


Keyboard Controller

An Intel 8242 surface-mount microcontroller contains the Phoenix Technologies PS/2 compatible keyboard/mouse controller.  PS/2 style keyboard and mouse connectors are located on the back panel of the system.  The microcontroller supports Power-On/Reset (POR), and keyboard password protection.  See the security section for details on the password.  The POR password can be set via the SETUP program.   In addition, the keyboard controller provides for the following "HOT" key sequences:

•	CTRL-ALT-DEL:	System software reset.

This sequence performs a software reset of the system by jumping to the beginning of the BIOS code and running the POST operation, excluding memory tests.

·	CTRL-ALT-1 and CTRL-ALT-2:	Turbo mode selection.

CTRLALT1 sets the system for de-turbo mode (emulation of an 8Mhz 80286 CPU using wait states) and CTRLALT2 sets the system for turbo mode (its normal operation at 33Mhz). Changing the Turbo mode may be prohibited by an operating system or application software.


System Memory

The S-Series memory sub-system consists of three logical banks of SIMM memory.  Bank one supports a single 36-bit SIMM socket, while banks two and three consist of four 9-bit SIMM sockets respectively.  All production systems ship with one 4 MB (1 Mb x 36) SIMM in bank one.  This SIMM can be removed and replaced with a  2 MB (512 Kb x 36) or  8 MB (2Mb x 36)  of memory.

Banks 2 and 3 each consist of four 9-bit SIMM sockets and can be populated with 256K X 9, 1M X 9, or 4M X 9 SIMMs.  SIMMs must be installed in the 9-bit sockets in sets of four of the same size and type, but no other restrictions exist.  The maximum memory size for S-Series is 40MBs.  For a complete list of possible memory configurations, refer to Appendix D.

Each bank supports 80-ns fast page mode SIMM memory.  Faster DRAM can be installed, however no improvement in performance will be seen.


Opti Chipset

The Opti 486SXWB is a three-chip solution for i486TMDX and i486SX ISA-based systems.  It includes an 82C495 System Controller, an 82C392 Data Buffer Controller, and an 82C206 Integrated Peripheral Controller.  Each of these chips functions is detailed below.

Related Topics:

82C495 System Controller

82C392 Data Buffer Controller

82C206 Integrated Peripheral Controller


82C495 System Controller

•	CPU reset control

•	CPU internal cache control

•	CPU burst mode control

•	CPU interface control

•	Integrated write-back cache controller with tag comparator

•	Page-mode DRAM controller

•	Burst line fill control logic


82C392 Data Buffer Controller

•	Data bus conversion

•	Parity generation/detection

•	AT-BUS direction control

•	Clock source for 82C206 and keyboard controller

•	Chip select for keyboard controller and RTC

•	Speaker control

•	NMI logic

•	Floating-point coprocessor interface

•	Keyboard reset and gate A20 emulation logic


82C206 Integrated Peripheral Controller

•	DMA control

•	Interrupt controller

•	Real Time Clock

•	Timers

•	CMOS RAM


Real Time Clock, Battery-backed CMOS RAM, and Battery

The real-time clock (RTC) and battery-backed CMOS RAM are contained within the Opti 82C206.  This provides a clock accurate to 12 minutes/year, 14 bytes of CMOS RAM for time keeping, and 50 bytes of general non-volatile RAM for storage of setup information.  All CMOS RAM is reserved for BIOS use.  A jumper on the baseboard or a setup option can be used to set system CMOS to its default values.  For jumper configurations, see Appendix B.

Power is provided by a 4.5 V Ray-O-Vac alkaline battery attached to the inside of the chassis.  The total life of the battery is 3 years.  After the battery lifetime is exhausted,  a replacement battery providing 3.6V-5V can be installed using the same connector at J7.


National PC87310 (SuperI/O)

Serial port, parallel port, floppy and IDE hard drive interface are all incorporated into a single component, the National PC87310.  This component provides:

•	Two NS16450 UARTs (No FIFO support)

•	IBM and Centronics compatible bi-directional parallel port

•	Industry standard floppy controller (no 2.88 MB floppy support)

•	IDE hard disk decode and chip select


Speaker

The speaker has been integrated onto the S-Series motherboard to improve manufacturability and reduce unnecessary cabling.  This piezo device can be enabled or disabled via setup or can be programmed via port 61H.  The speaker provides error beep code information during POST if the system cannot use the video interface.  The S-Series product guide (Order # 469281-001) contains detailed beep and error code information.


LPX Form Factor

The motherboard is designed to the LPX standard put forth by Western Digital.  This standard specifies board size, board mounting locations, connector locations for all external I/O, and riser card pinout.  Figure 1 details the board layout and mounting hole dimensions.

________________________________________________________________________

Figure 1: LPX Board Dimensions


System Level Features

Chassis Introduction

Peripheral Bays

Add-In Cards

Front Panel

Backpanel Connectors

Power Supply

Floppy Drive

Security


Chassis Introduction

A slimline case gives S-Series a sleek look, while four peripheral bays and five ISA slots gives S-Series the expandability required for traditional PC applications.  Power is provided by a 120 Watt power supply and security is supplied by a keyboard lock and BIOS password feature.  The S-Series has been tested to insure it meets the stringent environmental requirements demanded by Intel  systems.


Peripheral Bays

Four peripheral bays provide ample expandability for add-in drives.  Two 5 1/4" half-height drive bays,one 3 1/2" one-inch drive bay, and one 3 1/2" 1.6" drive bay  make up the peripheral bay offering.  The two 5 1/4" and one 3 1/2" are accessible from the front panel.  The final 3 1/2" hard drive bay is hidden.

________________________________________________________________________

Figure 2: S-Series Peripheral Bays


Add-In Cards

The S-Series contains five 16-bit ISA card slots oriented as in figure 3.  Three full length 16-bit cards can be added horizontally to the left side of the four-layer riser card.  In addition, two half length 16-bit cards can be added horizontally to the right side of the riser card.  In order to add card to these half length slots, the power supply must be removed to gain access to the filler panel screws.


Front Panel

The S-Series front panel provides access to the power switch and a hardware reset switch.  A power-on LED and a hard disk access LED provide visual system information.  Two 5.25" and one 3.5" peripheral bays are also accessible to the front panel, as detailed above.  Security is provided by an electrical keyboard lock.


Backpanel Connectors

The backpanel gives access to all of the external I/O integrated into the S-Series system.  The figure below details the S-Series backpanel connections.

________________________________________________________________________

Figure 3: S-Series Backpanel


Power Supply

A 120 Watt switchable power supply is integrated into S-Series to provide power for onboard resources, add-in cards, and peripherals.  The Astec Corp. power supply model XX can be set to operate at 90-132VAC (6 Amps AC) or 180-264 VAC (4 Amps AC) with a switch on the back of the system.  Current outputs are as in the table below.

DC Voltage	Max. Continuous Current	Peak Current 15 Seconds	Minimum  Current Load
+5V	16.0A	18.0	2.5A
-5V	0.2A	0.3A	0A
+12V	3.0A	6.0A	0.5A
-12V	0.3A	0.3A	0A
The following table details current usage of system resources.  This is preliminary  information and is only intended to provide a tool to calculate approximate total system power usage with additional resources added.

Resource	Typical Power
S-Series baseboard, 12MB (3 banks), 256K cache, 1MB Video DRAM	26 Watts
Teac 3.5" Floppy drive	1.7 Watts


Floppy Drive

S-Series integrates a 3.5" Teac Floppy drive Model FD-235HF into the top 3.5" bay for each product code.  This is the same proven floppy disk drive that has been used on many previous Intel systems.


Security

System security is provided by the S-Series system in three ways.

Related Topics:

Electric Keylock

BIOS Password

Floppy Write-protect Jumper


Electric Keylock

An electrical keylock inhibits keyboard and mouse input when locked.  Each system is provided with a set of unique keys, from a collection of 50 different keys.  A master key is available.


BIOS Password

A BIOS password feature provides security during the boot process.  A password can be entered in setup, and must be re-entered prior to disk boot each time the system is reset.  The password can be changed at the password prompt by entering <old password>/<new password>/<new password><enter>.  The password can also be cleared by entering <old password>/<enter>.   To clear the password if forgotten, set J29 to 1-2 and power off the system.  After the system has powered-on and finished the power on self test, turn the system off and reset the jumper.  The password feature will be enabled and the forgotten password will be cleared.


Floppy Write-protect Jumper

A jumper on the baseboard allows the floppy drive(s) to be write protected to protect against copying of data to a floppy diskette from any other data storage device.


Appendix Information

Product Codes

Jumpers

Setup Options

User Definable Upgrades

LPX Chassis Suppliers

BIOS Recovery

Regulatory Standards

Memory Map

Interrupts

Video Modes

MTBF DATA

Customer Support


Product Codes

S486SX204F	i486SX-20 system, 4MB, 3.5" floppy

S486SX254F	i486SX-25 system, 4MB, 3.5" floppy

S486DX334F	i486DX-33 system, 4MB, 3.5" floppy

B486SX204	i486SX-20 baseboard, 4MB (Bulk shipped in quantities of 10)

B486SX254	i486SX-25 baseboard, 4MB (Bulk shipped in quantities of 10)

B486DX334	i486DX-33 baseboard, 4MB (Bulk shipped in quantities of 8)


Jumpers

          J9 - This jumper controls the use of the off-board battery

                	*	1-2   Enable off-board battery

               	2-3   Disable off-board battery

          J13 - Flash write

               	*	1-2   Enable +12V to FLASH (Erasable)

                	2-3   Disable +12V to FLASH

          J14 - Flash Boot Block

                	1-2   Boot from Boot Block (recovery mode)

               	*	2-3   Boot from standard BIOS

          J16 - Cache size selection

9	7	5	3	1
10	8	6	4	2
Cache Size	Jumper Block					SRAM Required
	1-2	3-4	5-6	7-8	9-10
64 K	Out	Out	Out	Out	Out	8K x 8 (both banks)
128K	In	Out	In	In	Out	32K x 8 (bank 0)
* 256K	In	In	In	Out	In	32K x 8 (both banks)
J19 - Main CPU Selection (factory defaults - do not change)

2	4	6
1	3	5
JUMPER	i486TMDX	i486TMSX
1-3	Out	In
3-5	In	Out
2-4	Out	In
4-6	In	Out
J20 - The battery-backed CMOS RAM is reserved for BIOS use.  Jumper J20 can be used to clear system CMOS to its default values.  To clear CMOS memory, turn the system off, remove the system cover, and remove jumper J20.  Power the system back on again.  When POST has completed, the CMOS will be cleared.  Jumper J20 must now be re-installed or the CMOS will be cleared when the system is again powered on.

J27, J26 - Set CPU speed (see table below)

	J27	J26
20 MHz	2-3	1-2
25 MHz	1-2	2-3
33 MHz	1-2	1-2
Note: Use J27-J26 only for a speed change due to installation of an upgrade processor.  Changing the speed of the main processor to a greater operating speed can damage the component.

J28 - Onboard video enable jumper

Jumper J28 provides the means to enable or disable the onboard video controller.

         	1-2   Disable onboard video

        	*	2-3   Enable onboard video

J29 - Password Jumper

Jumper block J29 controls the use of a system password.

         	1-2   Disable and clear password

        	*	2-3   Enable password

J30 - Floppy write protect jumper

Jumper J30 allows the floppy disk drive to be write-protected.

         	1-2   Floppy write protected

         	*	2-3   Floppy writable

J31 - Jumper J31 which enables the operation of the super I/O controller is set at the factory and must not be changed.  This jumper must be installed across pins 2-3 to enable proper system operation.

         	1-2   Disable SuperI/O

         	*	2-3   Enable SuperI/O (floppy, IDE, parallel, serial)


Setup Options

Setup Page 1

Choice	Default Settings	Comments
System Time	Current time	Can also change from DOS
System Date	Current date	Can also change from DOS
Onboard Floppy	Enabled
Diskette A	3 1/2-inch, 1.44 MB
Diskette B	Not Installed
Onboard IDE	Disabled
Hard Disk 1	Not Installed
Hard Disk 2	Not Installed
User Definable Drives	48 and 49
Setup Page 2

Choice	Default Settings	Comments
Video Card	VGA/EGA	Display mode
800x600 Mode Refresh Rate	56 Hz	Power down  to take effect
1024x768 Mode Refresh Rate	Interlaced @ 44/88 Hz	Must power down system
Onboard Video Controller	Primary
Keyboard	Not Installed
Numlock On at Boot	No
Password	Not Installed
Setup Page 3

Choice	Default Settings	Comments
Base Memory	Set by system	Display only
Extended Memory	Set by system	Display only
Base Memory Above 512K	Enabled
Speaker	Enabled
Onboard Mouse	Enabled
Parallel Port	Base Address 378H: Compatible
Parallel Port Interrupt	Enabled	Disable for polled mode
Serial Port 1	Enabled
Serial Port 2	Enabled
Console Redir/Serial Port 1	Disabled
Console Redir/ Serial Port 2	Disabled
Setup Page 4

Choice	CMOS Clear Default	Comments
CPU Speed	Fast
Cache	Enabled	Optimum performance
Onboard Video Bios Mapping	To E0000H
Shadow C0000H to C3FFFH	Disabled
Shadow C4000H to C7FFFH	Disabled
Shadow C8000H to CBFFFH	Disabled
Shadow CC000H to CFFFFH	Disabled
Shadow D0000H to D3FFFH	Disabled
Shadow D4000H to D7FFFH	Disabled
Shadow D8000H to DBFFFH	Disabled
Shadow DC000H to DFFFFH	Disabled


User Definable Upgrades

System Memory options (SIMM Configuration)

Video DRAM Upgrade Parts

Cache SRAM Upgrade Parts

i487ÔSX/ i486 OverDriveÔ Processors


System Memory options (SIMM Configuration)

Bank 0 SIMM Type(Quantity)	Bank 1 SIMM Type(Quantity)	Bank 2 SIMM Type(Quantity)	Total Memory
512Kb X 36 (1)	-	-	2MB
512Kb X 36 (1)	1Mb X 9 (4)	-	6MB
512Kb X 36 (1)	1Mb X 9 (4)	1Mb X 9 (4)	10MB
512Kb X 36 (1)	4Mb X 9 (4)	-	18MB
512Kb X 36 (1)	4Mb X 9 (4)	1Mb X 9 (4)	22MB
512Kb X 36 (1)	4Mb X 9 (4)	4Mb X 9 (4)	34MB
1Mb X 36 (1)	-	-	4MB
1Mb X 36 (1)	1Mb X 9 (4)	-	8MB
1Mb X 36 (1)	1Mb X 9 (4)	1Mb X 9 (4)	12MB
1Mb X 36 (1)	4Mb X 9 (4)	-	20MB
1Mb X 36 (1)	4Mb X 9 (4)	1Mb X 9 (4)	24MB
1Mb X 36 (1)	4Mb X 9 (4)	4Mb X 9 (4)	36MB
2Mb X 36 (1)	-	-	8MB
2Mb X 36 (1)	1Mb X 9 (4)	-	12MB
2Mb X 36 (1)	1Mb X 9 (4)	1Mb X 9 (4)	16MB
2Mb X 36 (1)	4Mb X 9 (4)	-	24MB
2Mb X 36 (1)	4Mb X 9 (4)	1Mb X 9 (4)	28MB
2Mb X 36 (1)	4Mb X 9 (4)	4Mb X 9 (4)	40MB
-	256Kb X 9 (4)	-	1MB
-	256Kb X 9 (4)	256Kb X 9 (4)	2MB
-	1Mb X 9 (4)	-	4MB
-	1Mb X 9 (4)	256Kb X 9 (4)	5MB
-	1Mb X 9 (4)	1Mb X 9 (4)	8MB
-	4Mb X 9 (4)	-	16MB
-	4Mb X 9 (4)	256Kb X 9 (4)	17MB
-	4Mb X 9 (4)	1Mb X 9 (4)	20MB
-	4Mb X 9 (4)	4Mb X 9 (4)	32MB
Rows in bold indicate memory options attained from the standard memory configuration (4MB).


Video DRAM Upgrade Parts

S-Series can be upgraded to 1MB of video DRAM by installing four 70ns 256Kx4 Page Mode DIP DRAM.  Below are several vendors and their part numbers.

Texas Instruments	TMS44C256-70N

Siemens	HYB514256B-70

Toshiba	TC514256AP-70

NEC	uPD424256


Cache SRAM Upgrade Parts

S-Series can be upgraded with an external cache by adding SRAM components to DIP sockets on the baseboard.  The design requires 20 ns data SRAM and 15 ns tag and dirty bit SRAM.  Installation is as follows.  Refer to Appendix B for jumper settings.

Cache Size	SRAM Size
	Bank 0  U46-U49	Bank 1 U42-U45	Tag U50	Dirty Bit U51
64 K	(4) 8Kb x 8	(4) 8Kb x 8	(1) 8Kb x 8	(1) 64Kb x 1
128K	(4) 32Kb x 8	none	(1) 32Kb x 8	(1) 64Kb x 1
256K	(4) 32Kb x 8	(4) 32Kb x 8	(1) 32Kb x 8	(1) 64Kb x 1
The list below details the part numbers for a 64K, 128K, or 256K cache from several different vendors.

Device Type	Motorola	Cypress	IDT	Samsung	Mitsubishi
8 Kb x 8, 15 ns	MEM6264PC15	CY7C185-15PC	7164S15TP	KM68685BP-15	N/A
8 Kb x 8, 20 ns	MEM6264PC20	CY7C185-20PC	7164S20TP	KM68685BP-20	N/A
32 Kb x 8, 15 ns	MEM6206PC15	CY7C199-15PC	71256S15TP	KM68257BP-20	N/A
32 Kb x 8, 20 ns	MEM6206PC15	CY7C199-20PC	71256S20TP	KM68257BP-20	N/A
64 Kb x 1, 15 ns	MEM6287P15	CT7C187A-15PC	7187S15P	N/A	M5M5187BP-15


i487ÔSX/ i486 OverDriveÔ Processors
i487™SX/ i486 OverDrive™ Processors

Both of these upgrade components are available from Intel's Personal Computer Enhancement Division.  To obtain the location of the nearest Intel dealer contact 1 (800) 538-3373.


LPX Chassis Suppliers

Axxion Group Corporation

11 B. Leigh Fisher

El Paso, TX  79906

(915) 772-0088

Olsen Metal Products

1001 Crossroads Boulevard

Seguin, TX  78155

(512) 379-2799

Enlight Corporation, USA

345 Cloverleaf Drive, Unit 2B

Baldwin Park, CA  91706

(818) 369-4709


BIOS Recovery

IntelTM486 Classic S-Series incorporates the Phoenix Technologies system BIOS on a FLASH component.  FLASH BIOS provides easy upgrade capabilities without the need to replace an EPROM.  The upgrade utility fits on a single floppy diskette and provides the capability to save, verify, and update the system BIOS.  The upgrade utility can be run from a hard drive or a network drive, but no memory managers can be installed during upgrades.

Obtaining the FLASH Upgrade Utility can be done in one of two ways:

1.  The latest utility and BIOS code are available in Apps BBS under the OEM products - Classic section. Access to this area can be obtained using the following login.

PHONE NUMBER: (916) 356-3600

SYSTEM SETTING: 9600-N-8-1

Login

Related Topics:

Using the Upgrade Utility

Recovery Mode


Using the Upgrade Utility

If the utility is obtained via Apps BBS, UNZIP the archive and copy the files to a bootable MS-DOS 3.3, 4.01, or 5.0 bootable diskette.  Reboot the system with the upgrade diskette in the bootable floppy drive and follow the directions of the easy to use menu-driven program.


Recovery Mode

In the unlikely event the FLASH upgrade is interrupted catastrophically, it is possible the BIOS can be left in an unusable state.  Recovering from this condition requires the following steps.

1.  Change jumper J14 to position 1-2.

2.  Install the bootable upgrade diskette into drive A:

3.  Reboot the system.

4.  Because of the small amount of code available in the non-erasable boot block area, no video is available to direct the procedure.  The procedure can be monitored by listening to the speaker and looking at the floppy drive LED.  When the system beeps and the floppy drive LED is lit, the system is copying the recovery code into the FLASH device.  As soon as the drive LED goes off, the system can be turned off.

5.  Reset jumpers J14 to position 2-3.

6.  Leave the upgrade floppy in drive A: and turn the system on.

7.  Continue with the original upgrade.


Regulatory Standards

Environvental Parameter	Condition	Specification
Temperature
	Non-Operating	-40 degrees C to +70 degrees C
	Operating	+10 degrees C to +35 degrees C
Humidity
	Non-Operating	95% Rel. Humidity max @ 40 degrees C
	Operating, no HDD	85% RH max
	Operating, w /HDD	Not to exceed 26 degrees C wet bulb
Altitude
	Non-Operating	50,000 feet (15,240 meters)
	Operating	10,000 feet (3048 meters)
ESD
	1.0kV	No Errors
	2.5kV	No Errors
	5.0kV	5% soft errors, 0% hard errors, No physical damage
	7.5kV	10% soft, 0% hard, No physical damage
	10.0kV	25% soft, 5% hard, No physical damage
	12.5 kV	50% soft, 10% hard, No physical damage
	15.0kV	100% soft, 25% hard, No physical damage
	25.0kV	100% soft, 100% hard, No physical damage
Shock	Non-Operating	30.0G, 11ms, 1/2 sine
Acoustical Noise	1 meter, peripherals idle	Less than 40 dB max


Memory Map

Addr Range (Decimal)	Address Range (hex)	Size	Description
16384K-32768K	1000000-2000000	16384K	Extended Memory
16256K-16383K	FE0000-FFFFFF	128K	System & Video BIOS Copy
1024K-16255K	100000-FDFFFF	15232K	Extended Memory
960K-1023K	F0000-FFFFF	64K	Phoenix System BIOS
952K-959K	EE000-EFFFF	8K	FLASH Boot Block (Available as himem)
948K-951K	ED000-EDFFF	4K	User FLASH Area (available as himem if no user info is here)
928K-947K	E8000-ECFFF	20K	Phoenix Setup Program (disable via setup pre-boot only; with this option open to himem)
896K-927K	E0000-E7FFF	32K	Western Digital Video BIOS
800K-895K	C8000-DFFFF	96K	Available Hi Dos Memory(open to the ISA bus)
768K-799K	C000-C7FFF	32K	Optional VGA BIOS (enabled via setup; if disabled, open to the ISA bus)
736K-767K	B8000-BFFFF	32K	VGA Display Memory (not available to ISA bus)
704K-735K	B0000-B7FFF	32K	VGA & Mono Display Mem (HI mem w/ QEMM)(not available to the bus)
640K-703K	A0000-AFFFF	64K	VGA Display Memory (not available to the ISA bus)
639K	9FC00-9FFFF	1K	Extended BIOS Data (moveable by QEMM,386MAX)
512K-638K	80000-9FBFF	127K	Extended conventional
0K-511K	00000-7FFFF	512K	Conventional


Interrupts

Interrupt Request	System Resource
NMI	Parity Error
0	Reserved, Interval Timer
1	Reserved, Keyboard buffer full
2	Reserved, Cascade interrupt from slave PIC
3	On-board Serial Port 2
4	On-board Serial Port 1
5	User available or Parallel port
6	On-board Floppy controller
7	On-board Parallel Port
8	Real Time Clock
9	User available
10	User available
11	User available
12	On-board Mouse Port if enabled, else user available
13	Reserved, Math coprocessor
14	IDE if enabled
15	User available


Video Modes

Mode#	Resolution	Colors	Font	Clock	Vertical Refresh
21/54H	132col x 43rows	16	9x9	44.9MHz
41H	80col x 34rows	16	9x9	44.9MHz
47H	132col x 28rows	16	8x16	44.9MHz
55H	132col x 25rows	16	8x16	44.9MHz
56H	132col x 43rows	4 (mono)	9x9	44.9MHz
57H	132col x 25rows	4 (mono)	8x16	44.9MHz
58/6AH	800 x 600	16	8x8	36MHz	56Hz
				40MHz	60Hz
				50MHz	72Hz
5AH	1024 x 768	2	8x16	44.9MHz	Interlaced @ 44/88Hz
				65MHz	Non-Interlaced @ 60Hz
				75MHz	Non-Interlaced @ 70Hz
					Non-Interlaced @ 72Hz
5CH	800 x 600	256	8x8	36MHz	56Hz
				40MHz	60Hz
				50MHz	72Hz
5DH	1024 x 768	16	8x16	44.9MHz	Interlaced @ 44/88Hz
				65MHz	Non-Interlaced @ 60Hz
				75MHz	Non-Interlaced @ 70Hz
					Non-Interlaced @ 72Hz
5EH	640 x 400	256	8x16	25MHz
5FH	640 x 480	256	8x16	25MHz
60H	1024 x 768	256	8x16	44.9MHz	Interlaced @ 44/88Hz
				65MHz	Non-Interlaced @ 60Hz
				75MHz	Non-Interlaced @ 70Hz
					Non-Interlaced @ 72Hz


MTBF DATA

This information is calculated from predicted data @ 35C.

S-Series basboard 4 MB	97,152 hours

Power Supply (Astec SA145-3408)	100,000 hours

Floppy drive (Teac FD-235HF-4240)	30,000 hours

S-Series system (4 MB, floppy)	33,095 hours


Customer Support

This product is backed by Intel's industry leading support groups including Network Services Division (NSD) and IntelTechDirect.  NSD supports many of your network integration and service needs including providing world wide network integration and system repair services.  IntelTechDirect provides the following 3 major services:

•	iPAN (Intel Product Assistance Network)

An electronic Bulletin board with current product information, demo software and more...

Accessible via a 9600 BAUD modem set at no parity, 8 data bits, 1 stop bit.

US	(916) 356-3600

Europe  	44 793-69681

•	iPUB (Intel Product Update Bulletin)

A monthly publication containing product specific information.

•	iPALS (Intel Phone Action Line Support)

A direct telephone support line backed by highly qualified and well trained technical personnel.