Processor

80486SX/80486DX

Processor Speed

20/25/33MHz

Chip Set

VLSI

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external CPU/NPU card slot

NPU Options

80487SX/4167 (on external CPU/NPU card)

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J2

Reset switch

J6

Turbo LED

J4

Speaker

J19

Power LED & keylock

J5

CPU/NPU expansion card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

W1

pins 1 & 2 closed

»

CPU speed select switchable from keyboard

W3

pins 1 & 2 closed

CPU speed select forced high

W3

Open

CPU speed select forced low

W3

pins 2 & 3 closed

»

Monitor type select color

W4

pins 2 & 3 closed

Monitor type select monochrome

W4

pins 1 & 2 closed

»

Factory configured - do not alter

W7

pins 1 & 2 closed

»

Factory configured - do not alter

SW1/1

On

»

Factory configured - do not alter

SW1/2

Off

»

Factory configured - do not alter

SW1/3

On

»

Shadow video BIOS enabled

SW1/4

On

Shadow video BIOS disabled

SW1/4

Off

»

Factory configured - do not alter

SW1/5

On

»

Shadow system BIOS enabled

SW1/6

On

Shadow system BIOS disabled

SW1/6

Off

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

40MB

(4) 4M x 9

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

DRAM JUMPER CONFIGURATION

Size

W5

W6

W28

W29

1MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

2MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

4MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

6MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

8MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

10MB

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

12MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

16MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

16MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

24MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

32MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

40MB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

48MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

64MB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

DRAM SWITCH CONFIGURATION

Size

SW1/7

SW1/8

SW1/9

SW1/10

1MB

On

On

On

On

2MB

On

Off

On

On

4MB

On

On

On

Off

6MB

Off

On

On

On

8MB

On

Off

On

Off

10MB

Off

Off

On

On

12MB

Off

On

On

Off

16MB

Off

Off

On

Off

16MB

On

On

Off

Off

24MB

Off

On

Off

On

32MB

On

Off

Off

Off

40MB

Off

Off

Off

On

48MB

Off

On

Off

Off

64MB

Off

Off

Off

Off

CACHE CONFIGURATION

Size

Bank 0

64KB

(8) 16K x 4

256KB

(8) 64K x 4

CACHE CONFIGURATION

Size

W1

W2

W5

64KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 3 & 4, 5 & 6 open

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 3 & 4 closed, 5 & 6 closed

BURST MODE CONFIGURATION

Burst mode

W3

W4

W5

Enabled

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

Disabled

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 open