Copyright: ® Intel Corporation 1994


Help Contents
Contents

Classic S-Series Help

I. Introduction

II. Board Features

III. System Level Features

IV. Appendices

V. Glossary


I. Introduction

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.  A system design with video, hard disk, floppy control, mouse, and other I/O ports integrated, with five slots and 4 bays provides the expandability needed for traditional desktop PC applications.

A 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.


II. Board Features

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


CPU

Classic S-Series provides several different base CPU options; an i486TMSX running at 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
Flash ImplementationImplementation

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
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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
Upgrade UtilityUtility

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

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.  For a list of several chassis suppliers that support the LPX standard, refer to Appendix F.

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Figure 1: LPX Board Dimensions


III. 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.


IV. Appendices

A. Product Codes

B. Jumpers

C. Setup Options

D. Memory options

E. Upgrade Parts

F. LPX Chassis Suppliers

G. Performance Upgrades

H. BIOS Recovery

I. Regulatory Standards

J. Memory Map

K. Interrupts

L. Video Modes

M. MTBF DATA

N. Customer Support


A. 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)


B. Jumpers

          J9 - Off board battery disable

                	*	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
          	J31 - PC87310 Enable jumper

                	1-2   Disable SuperI/O

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

          J30 - Floppy write protect jumper

               	1-2   Floppy write protected

                	*	2-3   Floppy writable

          J29 - Password Jumper

                	1-2   Disable and clear password

               	*	2-3   Enable password

          J28 - Onboard video enable jumper

                	1-2   Disable onboard video

               	*	2-3   Enable onboard video

          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.


C. 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


D. Memory options

Rows in bold indicate memory options attained from the standard memory configuration (4MB).

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


E. Upgrade Parts

Video DRAM

Cache SRAM

i487TMSX/OverDriveTM


Video DRAM

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

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


i487TMSX/OverDriveTM

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.


F. 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


G. Performance Upgrades

The S-Series i486SX models incorporate a two socket CPU design providing for a variety of CPU upgrade possibilities.  The first socket site at U65 contains the i486SX CPU soldered to the baseboard.  The second socket site at U62, referred to as the OverDrive Processor Socket, allows for the installation of an OverDrive processor or an i487SX math coprocessor.  The Classic S-Series requires no jumper changes if the CPU upgrade runs at the same clock speed as the original CPU.  If  the upgrade CPU clock speed differs from the original CPU speed, then refer to the table below.

The S-Series i486DX-33 leaves the main CPU site (U65) empty and has the i486DX installed in the upgrade socket (U62).  Upgrades to the i486DX model  require the removal of the main CPU from the low insertion force (LIF) socket.  When purchasing an OverDrive processor for the S-Series i486DX, obtain the OverDrive Processor for i486DX Systems without an OverDrive Processor Socket.  The table below details the variety of upgrade options presented by the Classic S-Series.

If your main  CPU is . . .	and your upgrade component is . . .	change CPU speed  jumper to . . .
i486TMSX-20	i487TMSX-20	No change
	i487SX-25	J26: 1-2       J27: 2-3
	OverDriveTM 40	No change
	OverDrive  50	J26: 1-2       J27: 2-3
i486SX-25	i487SX-25	No change
	OverDrive  40	J26: 2-3       J27: 1-2
	OverDrive  50	No change
i486DX-33	OverDrive  40	J26: 2-3       J27: 1-2
	OverDrive  50	J26: 1-2       J27: 2-3


H. BIOS Recovery

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.


I. 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


J. 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


K. 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


L. 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


M. 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


N. 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.


V. Glossary

Baseboard: System PBA including BIOS, RAM and jumpers, also known as motherboard

BIOS: Basic Input/Output System

Cache: A small amount of high speed RAM used to store copies of memory locations found in slower system memory. This is used to improve system performance.

Cache Coherency: A cache memory location is said to be coherent when it contains an exact copy of the data found in the system memory location that it corresponds to.  When the cache is coherent a flag (the cache tag bit) is set.

Cache Tag Bit: A flag used to determine if a cache location contains a valid copy of the system memory location it corresponds to.

CAD/CAM: Computer Automated Design/Computer Automated Manufacturing

CGA: Color Graphics Adapter, an IBM video standard

CHMOS: Complementary High-performance Metal Oxide Semi-conductor

CMOS: Complementary Metal Oxide Semi-conductor

CoProcessor: An additional processor that works with the main CPU and extends its instruction set, typically for math operations, the Intel i487SX is a math coprocessor.

CPU: Central Processing Unit,  Typically the i486TM and its support circuitry

CSA: Canadian Standards Association

DAC: Digital to Analog Converter, used to display analog VGA video signal

DRAM: Dynamic Random Access Memory

EGA: Enhanced Graphics Adapter, an IBM video standard

EMI: Electro-Magnetic Interference

EPLD: Electrically Programmable Logic Devices

EPROM: Erasable Programmable Read Only Memory

FCC: Federal Communications Commission

FPU: Floating Point Unit

IC: Integrated Circuit

IDE: Integrated Drive Electronics, A hard disk drive interface for AT compatible systems. Integrates drive and controller

ISA: Industry Standard Architecture,  PC-AT interface for add-in cards

LIM EMS: Lotus-Intel-Microsoft Expanded Memory System, paged memory support under 1M

MCGA: Multi-Color Graphics Adapter, an enhanced CGA mode supported by some Hercules adapters

MDA: Monochrome Display Adapter, an IBM video standard (Does not support graphics)

MGA: Monochrome Graphics Adapter, an industry term used for graphic monochrome video subsystems

MOC: Market Order Code, System identification number found in Intel Product Catalog

MTBF: Mean Time Between Failures, a measure of system reliability

Motherboard: System PBA including BIOS, RAM and jumpers

NMI: Non-Maskable Interrupt, system parity or I/O channel check error interrupt

NSD: Network Systems Division, Intel's Service organization (used to be called ASD)

OEM: Original Equipment Manufacturer

PBA: Printed Board Assembly, tracked by identifying number and revision included on board label

PC-AT: Personal Computer - Advanced Technology

PC-XT: Personal Computer - eXtended Technology

PFP: Plastic Flat Pack, an IC packaging style

PLCC: Plastic Leadless Chip Carrier, an IC packaging style

POR: Power On Reset, caused by either a power-up or front panel reset

POST: Power-On Self-Test

PQFP: Plastic Quad Flat Pack, an IC packaging style

RAM: Random Access Memory

RFI: Radio Frequency Interference

ROM: Read Only Memory

SIMM: Single In-line Memory Module

Super VGA: 800x600x16 enhancement to VGA, VESA Standard

SRAM: Static Random Access Memory

TSR: Terminate and Stay Resident, a DOS application that stays loaded in RAM

UL: Under-writers Laboratories

VESA: Video Electronics Standards Association, developed Super VGA standard

VGA: Video Graphics Array, an IBM video standard

VLSI: Very Large Scale Integration