Processor

80486SX/80486DX(on external CPU/Cache module)

Processor Speed

25/33MHz(only with external CPU/Cache module)

Chip Set

AST

Max. Onboard DRAM

64MB

SRAM Cache

None

BIOS

AST

Dimensions

254mm x 338mm

I/O Options

Bus mouse port, CPU/Cache upgrade module, floppy drive interface, IDE interface, LAN module, parallel port, serial port (2), VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 2 (COM2)

J12

Floppy drive interface

J24

Parallel port

J13

External speaker

J27

Bus mouse port

J14

Fan power

J28

LAN module

J15 & J16

Front panel switches & LEDs

J29

Serial port 1 (COM1)

J17

Feature connector

J46

VGA port

J18

CPU/Cache upgrade module

J50, J51, J52, J53

VGA pass-through

J19

IDE interface LED

J100

IDE interface

J22

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

E1

open

»

Factory configured - do not alter

E2

pins 2 & 3 closed

»

Parallel port interrupt select IRQ7

E5

pins 2 & 3 closed

Parallel port interrupt select IRQ5

E5

pins 1 & 2 closed

»

CMOS memory normal operation

E6

open

CMOS memory clear

E6

closed

»

VGA port enabled

SW1/switch 1

closed

VGA port disabled

SW1/switch 1

open

»

Password check enabled

SW1/switch 2

open

Password check disabled

SW1/switch 2

closed

»

Factory configured - do not alter

SW1/switch 3

open

»

Factory configured - do not alter

SW1/switch 4

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

VRAM CONFIGURATION

Size

VRAM

512KB

(4) 44256

CONNECTIONS

Purpose

Location

CPU/Cache upgrade module

J50, J51, J52, J53

Note: Connections are on the backside of the module and correspond to the connector with the same label on the motherboard.

CPU/CACHE MODULE TYPE CONFIGURATION

Module Type

Jumper E4

Jumper E5

Jumper E7

Jumper E8

»

CPU only

open

closed

closed

closed

Cache only

closed

open

open

open

CPU and Cache

closed

closed

open

open

Note: These settings are given for information only and should not be changed.

CPU SPEED CONFIGURATION

Internal

External

Jumper E1

Jumper E3

Jumper E6

25MHz

25MHz

closed

closed

open

»

33MHz

33MHz

open

closed

open

50MHz

25MHz

closed

closed

open

66MHz

33MHz

open

closed

open

Note: These settings are given for information only and should not be changed.

CPU TYPE CONFIGURATION

CPU Type

Jumper E2

Jumper E9

Jumper E10

Jumper E11

80486DX2

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

ODP486SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

closed

»

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

80486SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

open

None

open

open

open

open

Note: These settings are given for information only and should not be changed.