Copyright: ® Marcia A. Petty


Help Contents
Contents

System specifications

Safety compliance

System dimensions

Environmental specifications

Power requirements

I/O addresses

Memory allocation map

System interrupts

Modifying the system

Installing a chip in the upgrade socket

Installing standard memory (SIMMs)

Installing secondary cache memory

Default jumper settings

Board connectors

Locations on the system board

Battery connector (J15)

Diskette drive connector (J13)

IDE hard disk drive connector (J14)

Keyboard connector (J10)

Parallel connector (J19)

Serial connectors (serial 1=J16, serial 2=J18)

Power connectors (J1 and J2)

Speaker connector (J25)

Front fan connector (J29)

VL-Bus video connector (J27)

Warnings, cautions, and notes

Warning:  turn off system power to protect yourself

Caution:  protect the system against electrostatic discharge

Note:  keep an equipment log

Note:  tools and equipment needed


Safety compliance

This equipment meets or exceeds requirements for safety in the US (UL 1950 1st Edition), Canada (CSA 950), and Europe (TUV to EN60950, IEC 950).


System dimensions

Height (with feet installed)	15.92 cm	(6.25 inches)

Width	41.65 cm	(16.35 inches)

Depth	42.67 cm	(16.75 inches)

Weight with 3.5-inch diskette drive	9.5 kg 	(21 pounds)


Environmental specifications

Temperature

Operating:	10 to 35 °C	(50 to 95 °F)
Nonoperating:	-40 to 70 °C	(-40 to 158 °F)

Humidity (no hard disk drive)

Operating:	85% relative humidity at 35 °C (95 °F)
Nonoperating:	95% relative humidity at 35 °C (95 °F)

Altitude

Operating:	to 3048 m (10,000 ft)
Nonoperating:	to 15,240 m (50,000 ft)

AC power	100 to 120 V ac, 50 to 60 Hz
200 to 240 V ac, 50 to 60 Hz

Noise at operator's position	41 dB maximum with peripherals idle

ESD	Tested to 25kV


Power requirements

AC input power

Output power

+5 V system current drain

-5 V and ±12 V system current drain


AC input power

200 watt power supply

Input frequency 50/60 Hz

Voltage	Current (Amps)

100-120	5

200-240	3


Output power

Amps

Available
power for ISA	Minimum 	Maximum
slots (integrated	required	continuous
Voltage	system)	current load	current

+5	 14 A	3.0 A	22.0 A

+12	 4 A	0.0 A	8.0 A

-5	 .3 A	0.0 A	0.5 A

-12	 .3 A	0.0 A	0.5 A

Power caution!

Any system integrated with a collection of drives and/or add-in boards must not exceed the current draw stated above.  Also, the maximum power drawn by the expansion cards must not exceed

14.0 A on +5 V

4.0 A on +12 V

0.3 A on -5 V

0.3 A on -12 V

The maximum power drawn by either set of the peripheral drive power cables must not exceed 5 A on +5V and 5 A on +12V.


+5 V system current drain

Icc Max	Icc Typical

System board

Intel486 SX @ 25 MHz	3800	2660

Intel486 DX @ 33 MHz	4200	3200

Intel486 DX2 @ 66 MHz	4900	3475

OverDrive processor

@ 50 MHz	950	775

@ 66 MHz	1200	975

Intel487 SX

@ 20 MHz	775	542

@ 25 MHz	950	665

SIMM DRAM

1M x 36-bit (4 MB)	1120	784

4M x 36-bit (16 MB)	900	600

Secondary cache SRAM, 128 KB	720	500

All current values are in milliAmperes.

Typical Icc is used where available, and 70% of Icc (max) is used otherwise.  Vcc = 5.25 V.

System board values include 4 MB SIMM (1M x 36-bit) but no ISA add-in boards.


-5 V and ±12 V system current drain
−5 V and ±12 V system current drain

Current drain (in Amps)

-5 V	+12 V	-12 V

System board (typical)	0.05	0.18	0.02

3.5-inch diskette drive

Maximum (write)	0	0.46	0

Nominal (standby)	0	0.007	0

Nominal (read)	0.28

WARNING!


I/O addresses

Address range
(in hexadecimal)	Function

022	Index for OPTi chip set

024	Data for OPTi chip set

061	AT-compatible configuration port

078	System configuration port

07A	Bidirectional parallel port configuration

1F0 - 1F7	IDE hard disk controller (87310)

278 - 27F	Parallel port 2

2F8 - 2FF	Serial port 2

378 - 37F	Parallel port 1

398 - 399	National PC87311 Super I/O initialization ports

3B0 - 3DF	Video controller

3F0 - 3F7	Diskette drive controller

3F3	Configuration port for 87310 (write only)

3F8 - 3FF	Serial port 1

46E8	Video controller


Memory allocation map

All addresses are in hexadecimal.

The flash EPROM device occupies the first 64 KB of BIOS memory.  After boot-up, this area is free for use by an extended memory manager.


System 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	Onboard serial port 2

4	Onboard serial port 1

5	User available

6	Onboard diskette controller

7	Onboard parallel port

8	Real-time clock

9	User available

10	User available

11	User available

12	User available

13	Reserved, math coprocessor

14	Onboard IDE hard disk controller

15	User available


Installing a chip in the upgrade socket

Depending on the type of chip you are installing, you may need to change jumpers on the system board to specify the correct type of CPU and input speed.

Caution!

Related Topics:

Specify CPU speed (J5 - J6)

Specify CPU type (J32 - J33)


Specify CPU speed (J5 - J6)

J5 setting	J6 setting

16 MHz	1-2	1-2

20 MHz	2-3	1-2

25 MHz	1-2	2-3

33 MHz	2-3	2-3

The jumpers are set for the input speed of the CPU installed in the system.  If you are installing an upgrade chip that has a different input speed from the system CPU, reset the jumpers as needed.  You may also need to change the jumper that specifies the CPU type.


Specify CPU type (J32 - J33)

J32 setting	J33 setting

Intel486 SX	3-4	4-6

Intel486 DX or DX2	1-2, 5-6	3-5, 4-6

Intel487 SX or future OverDrive processor	1-2, 5-6	1-3, 2-4

The jumpers are set for the CPU installed in the system.  If you are installing an upgrade chip, reset the jumpers as needed.  You may also need to change the jumper that specifies the CPU input speed.


Installing standard memory (SIMMs)

Add standard memory by installing SIMMs.

Standard memory configuration:

Minimum =  4 MB of DRAM installed at socket U5 (bank 0)

Maximum =  64 MB

Four socket locations:  U5, U12, U16, and U20 (72-pin vertical sockets) (see figure for socket locations)

Capacities supported (36-bit = 32 data bits and 4 parity bits):

1 MB:	256K x 36-bit

4 MB:	1M x 36-bit

16 MB:	4M x 36-bit

Each memory bank (0 through 3) supports 80ns or faster fast-page-mode, single-side DRAM.

You must install SIMMs in each socket sequentially.  The largest SIMM size must be in the highest numbered bank.  One socket (bank, in this case) can hold a different size than another socket.

The system automatically detects system memory that is installed, so you do not need to set jumpers to specify memory size.

Related Topics:

Memory configuration table, 1 MB through 20 MB

Memory configuration table, 24 MB through 64 MB


Memory configuration table, 1 MB through 20 MB

Memory	Bank 0	Bank 1	Bank 2	Bank 3

1 MB	256K x 36	--	--	--

2 MB	256K x 36	256K x 36	--	--

3 MB *	256K x 36	256K x 36	256K x 36

4 MB	1 MB x 36	--	--	--

5 MB	256K x 36	1M x 36	--	--

6 MB	256K x 36	256K x 36	1M x 36	--

8 MB	1 MB x 36	1 MB x 36	--	--

9 MB	256K x 36	1 MB x 36	1 MB x 36

10 MB	256K x 36	256K x 36	1 MB x 36	1 MB x 36

18 MB *	256K x 36	256K x 36	4 MB x 36	--

12 MB	1 MB x 36	1 MB x 36	1 MB x 36	--

13 MB	256K x 36	1 MB x 36	1 MB x 36	1 MB x 36

16 MB	1 MB x 36	1 MB x 36	1 MB x 36	1 MB x 36

16 MB	4 MB x 36	--	--	--

20 MB	1 MB x 36	4 MB x 36	--	--

20 MB	4 MB x 36	1 MB x 36	--	--

New modes are marked by an asterisk.


Memory configuration table, 24 MB through 64 MB

Memory	Bank 0	Bank 1	Bank 2	Bank 3

24 MB	1 MB x 36	1 MB x 36	4 MB x 36	--

24 MB	1 MB x 36	4 MB x 36	1 MB x 36	--

24 MB	4 MB x 36	1 MB x 36	1 MB x 36	--

28 MB	1 MB x 36	1 MB x 36	4 MB x 36	1 MB x 36

28 MB	1 MB x 36	4 MB x 36	1 MB x 36	1 MB x 36

28 MB	4 MB x 36	1 MB x 36	1 MB x 36	1 MB x 36

32 MB	4 MB x 36	4 MB x 36	--	--

36 MB	1 MB x 36	4 MB x 36	4 MB x 36	--

36 MB	4 MB x 36	1 MB x 36	4 MB x 36	--

36 MB	4 MB x 36	4 MB x 36	1 MB x 36	--

40 MB	1 MB x 36	1 MB x 36	4 MB x 36	4 MB x 36

40 MB	1 MB x 36	4 MB x 36	4 MB x 36	1 MB x 36

40 MB	4 MB x 36	1 MB x 36	4 MB x 36	1 MB x 36

40 MB	4 MB x 36	4 MB x 36	1 MB x 36	1 MB x 36

48 MB	4 MB x 36	4 MB x 36	4 MB x 36	--

52 MB	1 MB x 36	4 MB x 36	4 MB x 36	4 MB x 36

52 MB	4 MB x 36	1 MB x 36	4 MB x 36	4 MB x 36

52 MB	4 MB x 36	4 MB x 36	4 MB x 36	1 MB x 36

64 MB	4 MB x 36	4 MB x 36	4 MB x 36	4 MB x 36

New modes are marked by an asterisk.


Installing secondary cache memory

ESD caution!

Secondary cache memory can be installed in these configurations:  64 KB, 128 KB, 256 KB (maximum).

Device	Socket location

Data SRAMs (32K x 8-20ns or 8K x 8-20ns)	U42-U45 and U54-U57

Tag bit SRAM (32K x 8-15ns)	U50

Dirty-bit SRAM (64K x 1-15ns)	U62

Install a cache RAM device by matching the notch on the device with a notch on the socket or a notched white line on the board.

Related Topics:

Installing 64 KB cache RAM

Installing 128 KB cache RAM

Installing 256 KB cache RAM

Jumper setting for cache RAM (J34)


Installing 64 KB cache RAM

Install the first data SRAM in socket U42.

Install the remaining devices in sockets U43 - U45 and U54 - U57 as shown.

Jumpers:  NO jumpers installed at J34 on the system board.


Installing 128 KB cache RAM

Install the first data SRAM in socket U42.

Install the remaining devices in sockets U43 - U45 as shown.

Jumpers:  installed on pins 1-2 and 5-6 at J34 on the system board.


Installing 256 KB cache RAM

Install the first data SRAM in socket U42.  Install the remaining devices in sockets U43 - U45 and U54 - U57 as shown.

Jumpers:  installed on pins 1-2, 3-4, and 7-8 at J34 on the system board.  This is the default setting, although no SRAM devices are shipped.


Jumper setting for cache RAM (J34)

0 KB	jumpers can be in or out

64 KB	no jumpers installed

128 KB	1-2, 5-6

256 KB	1-2, 3-4, 7-8 (default, although no SRAM devices are shipped)

Set the jumpers for the correct amount of secondary cache RAM you are installing.


Default jumper settings

In the list, click on the jumper block number to go to the topic.

Jumper
block	Default setting

CPU speed	J5 - J6	__	Set for the installed CPU.

CPU type	J32 - J33	__	Set for the installed CPU.

Cache RAM size	J34	1-2, 3-4, 7-8	Set for 256 KB, although
no SRAM chips are installed.

Super I/O controller	J4	1-2	Enabled

VL-Bus	J31	1-2	Set for delayed-ready mode

Password	J7	2-3	Retained at power-on

Parallel port data direction	J9	1-2	Output (set through hardware)

Parallel port, control the	J11	2-3	Change through hardware
data direction

Flash write to EPROM	J30	1-2	Enabled
to update the BIOS

System boot source	J3	2-3	From standard BIOS boot block

System configuration settings	J25	1-2	Retained at power-on
stored in CMOS RAM

Battery size	J17	2-3	3.6 volt or 4.5 volt

A jumper is a small plastic-encased conductor that slips over two jumper pins.  To change a jumper setting, use a pair of fine needle-nosed pliers to remove the jumper from its current location and press it onto the two pins for the desired setting.  Use caution when removing or installing jumpers.

Related Topics:

Enable Super I/O controller (J4)

Specify VL-Bus ready mode (J31)

Specify direction of parallel port data (J9)

Control the parallel port selection (J11)

Retain password at power-on (J7)

Save hardware settings in CMOS RAM at power-on (J25)

Enable BIOS upgrade by writing to the flash EPROM (J30)

Specify boot source (J3)

Specify battery size (J17)


Enable Super I/O controller (J4)

Enable diskette, IDE hard drive, serial and parallel ports	1-2    default

Disable the drives and ports	2-3

This jumper is set at the factory to enable the functions of the super I/O (PC87311) controller (for diskette drive, optional IDE hard drive, and serial and parallel ports).  Do not change the setting unless you are installing an add-in board as a drive controller.


Specify VL-Bus ready mode (J31)

Delayed ready	1-2    default

Direct ready	2-3


Specify direction of parallel port data (J9)

Parallel port data direction is output	1-2    default

Parallel port data direction is input	2-3

A jumper installed at J9 determines whether data is input or output through the parallel port.  The default is output.  Some devices such as scanners need to input data to the system through the parallel port.  In this case, you would move the jumper at J9 to pins 2-3.

To control the direction through software rather than hardware, see "Control the parallel port selection."


Control the parallel port selection (J11)

Redirect by using hardware	2-3    default

Redirect by using software	1-2

The direction of data through the parallel port can be selected using hardware (the default) or software.  We recommend that you do not change the default.  To specify whether data is output or input through the parallel port, see "Specify direction of parallel port data" (the default is output).


Retain password at power-on (J7)

Password is retained at power-on	2-3    default

Password is cleared at power-on	1-2

A password is initially entered during Setup and must be re-entered each time the system is reset (a warm boot from the hard disk) or powered-on (cold boot).  The jumper at J7 controls whether the stored password is retained or cleared at power-on.  To create a new password, see "Clearing and Resetting the Password" in the printed product guide.


Save hardware settings in CMOS RAM at power-on (J25)

Save hardware settings at power-on	17-18  installed    default

Clear hardware settings at power-on	17-18  not installed

Most of the system hardware configuration settings are stored in CMOS RAM.  With a jumper installed on pins 17 and 18 at J25, the settings remain intact each time the system is powered-on.


Enable BIOS upgrade by writing to the flash EPROM (J30)

Enable writing to the flash EPROM	1-2    default

Disable writing to the flash EPROM	2-3

The default setting allows writing to the flash EPROM to upgrade the system BIOS.  Change this jumper only if you want to prevent flash memory from being upgraded.


Specify boot source (J3)

Boot from standard BIOS	2-3    default

Boot from boot block on flash memory device	1-2

Under the default setting, the system boots from the standard BIOS.  The setting can be changed so the system can boot from the boot block on the flash memory device (EPROM).

For the circumstances under which you might need to boot from the EPROM boot block and the procedure to do so, see "Recovering the Flash BIOS Process" in the printed product guide.


Specify battery size (J17)

3.6 or 4.5 V battery	2-3    default

6 V battery	1-2


Locations on the system board

add-in board slots	J20 - J24, J26

battery connector (offboard)	J15

flash EPROM (containing the BIOS)	U1

central processing unit (CPU)	U59

diskette drive connector	J13

front fan connector (auxiliary fan)	J29

front panel connectors	J25

graphics board expansion slot (using VL-Bus)	J27, J28

hard disk drive connector (IDE drive)	J14

keyboard connector (AT-style)	J10

keyboard controller	U4

memory module (SIMM) sockets

OverDrive-compatible 238-pin socket	U58

OPTi 82C206 integrated peripheral controller 	U48

OPTi 82C392 data buffer controller	U19

OPTi 82C495 ISA system controller	U41

parallel port connector	J19

power supply connectors 	J1 and J2

secondary cache memory data bank 0	U42 - U45

secondary cache memory data bank 1	U54 - U57

secondary cache tag bits RAM	U50

secondary cache dirty bits RAM	U62

serial port 1 (COM1) connector	J16

serial port 2 (COM2) connector	J18

For information about items not covered here, see the printed product guide.


Battery connector (J15)

Pin #	Signal

1	+5V battery

2	Key

3	Open

4	Ground

If you change the battery size, you may need to change the battery jumper.


Diskette drive connector (J13)

Signal mapping for the connector on the end of the signal cable attached to the system board

Pin #	Signal

2	Density select*

4	Reserved

6	Data rate 0

8	Index*

10	Motor enable A*

12	Drive select B*

14	Drive select A*

16	Motor enable B*

18	DIR*

20	STEP*

22	Write data*

24	Write gate*

26	Track 00*

28	Write protect*

30	Read data*

32	Side 1 select*

34	Diskette change*

5	Key

All other odd-numbered pins	Ground

*  Active low


IDE hard disk drive connector (J14)

Signal mapping for the connector on the end of the signal cable attached to the system board

Pin #	Signal 	Pin #	Signal

1	Reset IDE*	21	DMA request

2	Ground	22	Ground

3	Host data 7	23	I/O write*

4	Host data 8	24	Ground

5	Host data bit  6	25	I/O read*

6	Host data bit 9	26	Ground

7	Host data bit 5	27	I/O channel ready

8	Host data bit 10	28	IDEBALE

9	Host data bit 4	29	DMA acknowledge*

10	Host data bit 11	30	Ground

11	Host data bit 3	31	Interrupt request 14

12	Host data bit 12	32	I/O channel size 16*

13	Host data bit 2	33	Address bit 1

14	Host data bit 13	34	PDIAG*

15	Host data bit 1	35	Address bit 0

16	Host data bit 14	36	Address bit 2

17	Host data bit 0	37	Host chip select 0*

18	Host data bit 15	38	Host chip select 1*

19	Ground	39	Disk activity/DR1PRES*

20	Connector key	40	Ground

*  Active low

The IDE interface can be disabled by setting jumper J4 to pins 2-3.  When this interface is disabled, the I/O address range and interrupt request 14 (IRQ14) are available for use by add-in boards.


Keyboard connector (J10)

Signal mapping for the connector on the back panel of the system

Pin #	Signal

1	Clock

2	Data

3	Not connected

4	Vcc

5	Vcc


Parallel connector (J19)

Signal mapping for the connector on the end of the cable attached to the system board

Pin #	Signal 	Pin #	Signal

1	Strobe*	13	Data bit 5

2	Auto Feed*	14	Ground

3	Data bit 0	15	Data bit 6

4	Error*	16	Ground

5	Data bit 1	17	Data bit 7

6	Initialize printer*	18	Ground

7	Data bit 2	19	Acknowledge*

8	Select input*	20	Ground

9	Data bit 3	21 	Busy

10	Ground	22	Ground

11	Data bit 4	23	Paper end

12	Ground	24	Ground

*  Active low


Serial connectors (serial 1=J16, serial 2=J18)

Signal mapping for the connectors on the ends of the cables attached to the system board

Pin #	Signal

1	Data carrier detected*

2	Data set ready

3	Receive data

4	Request to send

5	Transmit data

6	Clear to send

7	Data terminal ready

8	Ring indicator

9	Ground

*  Active low


Power connectors (J1 and J2)

Signal mapping for the connectors on the end of the cables attached to the system board

Pin #	Signal	Pin #	Signal

J11.1	Power good	J15.1	Ground

J11.2	Vcc	J15.2	Ground

J11.3	+12 V dc	J15.3	-5 V dc

J11.4	- 12 V dc	J15.4	Vcc

J11.5	Ground	J15.5	Vcc

J11.6	Ground	J15.6	Vcc


Speaker connector (J25)

Signal mapping for the connector on the end of the wires attached to the system board

Pin number	Signal name

1	Speaker signal

2	Not connected

3	Not connected

4	Ground


Front fan connector (J29)

Signal mapping for the connector on the end of the wires attached to the system board

 Pin Number	Signal Name

1	Ground

2	+12V

3	Ground


VL-Bus video connector (J27)

Signal mapping for the connector located in line with slot 1 on the system board.

Pin #	Signal 	Pin #	Signal

B1	Pixel data 0	A1	Pixel data 1

B2	Pixel data 2	A2	Pixel data 3

B3	Pixel data 4	A3	Ground

B4	Pixel data 6	A4	Pixel data 5

B5	Pixel data 8	A5	Pixel data 7

B6	Ground	A6	Pixel data 9

B7	Pixel data 10	A7	Pixel data 11

B8	VPD3	A8	Pixel data 13

B9	Vcc	A9	Pixel data 15

B10	Pixel data 14	A10	Ground

B11	Pixel data 16	A11	Pixel data 17

B12	Pixel data 18	A12	Vcc

B13	Pixel data 20	A13	Pixel data 19

B14	Ground	A14	Pixel data 21

B15	Pixel data 22	A15	Pixel data 23

B16	Pixel data 24	A16	Pixel data 25

B17	Pixel data 26	A17	Ground

B18	Pixel data 28	A18	Pixel data 27

B19	Pixel data 30	A19	Pixel data 29

B20	Vcc	A20	Pixel data 31

B21	Address 31	A21	Address 30

B22	Ground	A22	Address 28

B23	Address 29	A23	Address 26

B24	Address 27	A24	Ground

B25	Address 25	A25	Address 24

B26	Address 23	A26	Address 22

B27	Address 21	A27	Vcc

B28	Address 19	A28	Address 20

B29	Ground	A29	Address 18

B30	Address 17	A30	Address 16

B31	Address 15	A31	Address 24

B32	Vcc	A32	Address 12

B33	Address 13	A33	Address 10

B34	Address 11	A34	Address 8

B35	Address 9	A35	Ground

B36	Address 7	A36	Address 6

B37	Address 5	A37	Address 4

B38	Ground	A38	Not connected

B39	Address 3	A39	BE04*

B40	Address 2	A40	Vcc

B41	Not connected	A41	BE1*

B42	Reset*	A42	BE2*

B43	D/C*	A43	Ground

B44	M/10*	A44	BE3*

B45	W/R*	A45	LAD5*

B48	RDYRTN*	A48	LRDY*

B49	Ground	A49	LDEV*

B50	Interrupt 9	A50	LREQx*	TP113

B51	BRDY*	A51	Ground

B52	BLAST*	A52	LGNTx*	TP112

B53	ID0	A53	Vcc

B54	ID1	A54	ID2

B55	Ground	A55	ID3

B56	Local clock	A56	ID4

B57	Vcc	A57	LKEN*	TP111

B58	LSB16	A58	Leads*	TP110

*  Active low


Warning:  turn off system power to protect yourself

Unplug the system before you do the procedures described here.  Failure to disconnect power before you open the system can result in personal injury or equipment damage.  Hazardous voltage, current, and energy levels are present in this product.  Power switch terminals can have hazardous voltages present even when the power switch is off.

The procedures are written for system integrators, engineers, and service technicians and should be done only by qualified personnel.  The procedures assume familiarity with the general terminology associated with personal computers and with the safety practices and regulatory compliance required for using and modifying electronic equipment.

Do not operate the system with the cover removed.  Always replace the cover before turning on the system.


Caution:  protect the system against electrostatic discharge

Electrostatic discharge (ESD) can damage disk drives, add-in boards, and other components.  Do any of the described procedures at an ESD workstation only.

If such a station is not available, you can provide some ESD protection by wearing an antistatic wrist strap and attaching it to a metal part of the system chassis.

Add-in boards can be extremely sensitive to ESD and always require careful handling.  After removing the board from its protective wrapper or from the system, place the board flat on a grounded, static-free surface, component-side up.  Use a conductive foam pad if available, but not the board wrapper.  Do not slide the board over any surface.


Note:  keep an equipment log

Set up an equipment log to record the system model and serial numbers, all installed options, and other information about the system.  If you need this information, it will be easier to consult the log than to open up and examine the system.


Note:  tools and equipment needed

You will need a phillips screwdriver (#2 bit), a DIP device removal tool or a small flat-bladed screwdriver to remove SRAMs, and a jumper removal tool.   We recommend that you use an antistatic wrist strap and a conductive foam pad when working on the system.  It is preferable that you work on the product at an ESD workstation.


Glossary of Terms

SIMM


SIMM

A SIMM is a single in-line memory module.


Caution:  Do not load the system to both 22 A on +5 V and 8.0 A on +12 V.  This will exceed the maximum power supplied by the power supply.  If 8.0 A on the +12 V output is required, only 20 A is available on the +5 V output.  If 22.0 A is required on the +5 V output, only 7.0 A is available on the +12 V output.


WARNING:  To avoid damage to the system board or power supply, do not exceed a total of 200 watts power draw.


Caution:  Do not set the CPU or an OverDrive (tm) Processor to run faster than its specified operating speed.  Doing so can damage the component and the system board and will void the system warranty.


A SIMM is a single in-line memory module.


Caution:  SRAM devices are particularly susceptible to ESD.  Install SRAMs at an ESD workstation only.


CAUTION:  When using a pair of fine needle-nosed pliers to remove or install a jumper, always grip the narrow sides of the jumper with the pliers, never the wide sides.  Gripping the wide sides can damage the contacts inside the jumper, causing intermittent problems with the function controlled by that jumper.  Do not squeeze the pliers or other tool you use to remove a jumper, or you may bend or break the stake pins on the board.


At the front panel, there are connectors for the hard drive activity light, power on/off light, keyboard lock, speaker, and the reset button.


Bank 0 at U5
Bank 1 at U12
Bank 2 at U16
Bank 3 at U20


IDE is a 16-bit interface for intelligent hard disk drives.  It provides an interface directly to the AT bus.