Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/50(internal)/50/66(internal)

Chip Set

SIS

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slot (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J3

Power LED & keylock

J7

Turbo switch

J4

32-bit VESA local bus slot

S1

Speaker

J5

32-bit VESA local bus slot

S2

Reset switch

J6

32-BIT VESA LOCAL BUS SLOT CONFIGURATION

CPU Speed

JP24

JP25

JP26

JP27

<=33MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

JP1

open

»

Monitor type select color

JP2

closed

Monitor type select monochrome

JP2

open

»

Power good signal detect from power supply

JP14

pins 1 & 2 closed

Power good signal detect from board

JP14

pins 2 & 3 closed

SRAM CONFIGURATION

Size

Cache

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(2) 32K x 8

SRAM JUMPER CONFIGURATION

Size

SR1

SR2

SR3

SR4

SR5

64KB

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

128KB

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 1 & 2

256KB

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

Note:Pins designated should be in the closed position.

CPU SPEED SELECTION

Speed

JP10

JP11

JP12

JP13

20MHz

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

25MHz/50(internal)

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 1 & 2

33MHz/66(internal)

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

50MHz

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

CPU type

JP6

JP7

JP8

80486SX

open

open

pins 2 & 3 closed

80487SX

closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX/DX2

closed

pins 1 & 2 closed

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9