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Processor

80386SX/CX486SLC

Processor Speed

25/33/40MHz

Chip Set

ALI

Video Chip Set

Cirrus Logic

Maximum Onboard Memory

16MB

Maximum Video Memory

1MB

Cache

None

BIOS

AMI

Dimensions

223mm x 203mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

VGA port

CN1

Turbo LED

JP28 pins 1 & 2

Parallel port

CN2

Turbo switch

JP28 pins 4 & 5

Serial port 2

CN3

IDE interface LED

JP29

Serial port 1

CN4

Reset switch

JP30

PS/2 mouse port

CN5

Speaker

JP31

Floppy drive interface

CN6

Power LED & keylock

JP32

IDE interface

CN7

LED connector

JP33

VGA feature connector

CN8

Riser slot

SL1

External battery

JP6

USER CONFIGURABLE SETTINGS

Function

Label

Position

Monitor type select color

JP5

Open

Monitor type select monochrome

JP5

Closed

�

CMOS memory normal operation

JP7

Open

CMOS memory clear

JP7

Closed

PS/2 mouse disabled

JP8

Open

PS/2 mouse enabled

JP8

Closed

Floppy drive interface enabled

JP15

Pins 1 & 2 closed

Floppy drive interface disabled

JP15

Pins 2 & 3 closed

IDE interface enabled

JP16

Pins 1 & 2 closed

IDE interface disabled

JP16

Pins 2 & 3 closed

RTC type select 146818

JP20

Open

RTC type select Dallas

JP20

Closed

Parity enabled

JP22

Open

Parity disabled

JP22

Closed

Pipeline mode enabled

JP23

Pins 1 & 2 closed

Pipeline mode disabled

JP23

Pins 2 & 3 closed

�

Factory configured - do not alter

JP25

Unidentified

IRQ9 enabled

JP26

Closed

IRQ9 disabled

JP26

Open

NPU synchronous with CPU

JP27

Pins 1 & 2 closed

NPU asynchronous with CPU

JP27

Pins 2 & 3 closed

On board video enabled

JP36

Pins 1 & 2 closed

On board video disabled

JP36

Pins 2 & 3 closed

Power good signal detect from power supply

JP37

Pins 1 & 2 closed

Power good signal detect from board

JP37

Pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(2) 256K x 9

None

1MB

(2) 256K x 9

(2) 256K x 9

2MB

(2) 1M x 9

None

4MB

(2) 1M x 9

(2) 1M x 9

8MB

(2) 4M x 9

None

16MB

(2) 4M x 9

(2) 4M x 9

Note: The location of banks 0 & 1 is unidentified.

VIDEO MEMORY CONFIGURATION

Note: Board accepts 256KB/512KB/1MB video memory. The size of the chips is unidentified.

CPU SPEED SELECTION

Speed

JP21

JP24

JP39

25MHz

1 & 2

2 & 3

1 & 2, 5 & 6

33MHz

2 & 3

2 & 3

1 & 2, 3 & 4

40MHz

1 & 2

1 & 2

5 & 6

Note: Pins designated should be in the closed position.

PARALLEL PORT ADDRESS SELECTION

Setting

JP9

JP10

278h

Pins 2 & 3 closed

Pins 2 & 3 closed

378h

Pins 1 & 2 closed

Pins 1 & 2 closed

3BCh

Pins 1 & 2 closed

Pins 2 & 3 closed

Disabled

Pins 2 & 3 closed

Pins 1 & 2 closed

SERIAL PORT 1 ADDRESS SELECTION

Setting

JP11

JP12

2E8h

Pins 1 & 2 closed

Pins 2 & 3 closed

3E8h

Pins 2 & 3 closed

Pins 2 & 3 closed

3F8h

Pins 1 & 2 closed

Pins 1 & 2 closed

Disabled

Pins 2 & 3 closed

Pins 1 & 2 closed

SERIAL PORT 2 ADDRESS SELECTION

Setting

JP13

JP14

2E8h

Pins 1 & 2 closed

Pins 2 & 3 closed

3E8h

Pins 1 & 2 closed

Pins 1 & 2 closed

3F8h

Pins 2 & 3 closed

Pins 2 & 3 closed

Disabled

Pins 2 & 3 closed

Pins 1 & 2 closed

SERIAL PORT 1 INTERRUPT SELECTION

IRQ

JP38

IRQ3

Pins 1 & 2 closed

IRQ4

Pins 3 & 4 closed

IRQ5

Pins 5 & 6 closed

SERIAL PORT 2 INTERRUPT SELECTION

IRQ

JP38

IRQ3

Pins 7 & 8 closed

IRQ4

Pins 9 & 10 closed

IRQ5

Pins 11 & 12 closed

PARALLEL PORT INTERRUPT SELECTION

IRQ

JP38

IRQ5

Pins 13 & 14 closed

IRQ7

Pins 15 & 16 closed