Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

SIS

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA card slot (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

J3

Reset switch

J6

Turbo switch

J4

Power LED & keylock

J7

Speaker

J5

32-bit VESA card (2)

S1 & S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP1

closed

»

Monitor type select color

JP2

closed

Monitor type select monochrome

JP2

open

»

Factory configured - do not alter

JP9

unknown

»

Power good signal detect from power supply

JP14

pins 1 & 2 closed

Power good signal detect from board

JP14

pins 2 & 3 closed

»

Factory configured - do not alter

JP15

unknown

»

Factory configured - do not alter

JP16

unknown

»

Factory configured - do not alter

JP24

unknown

»

Factory configured - do not alter

JP25

unknown

»

VESA bus wait states select 0

JP26

open

VESA bus wait state select 1

JP26

open

»

CPU speed select £ 33MHz

JP27

closed

CPU speed select > 33MHz

JP27

closed

Note: The locations of JP1 and JP16 are unknown.

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) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CPU SPEED CONFIGURATION

Speed

JP10

JP11

JP12

JP13

66MHz (internal)

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

50MHz

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

50MHz (internal)

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

33MHz

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

25MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

20MHz

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

CPU JUMPER CONFIGURATION

CPU

JP6

JP7

JP8

80486DX

closed

pins 1 & 2 closed

pins 1 & 2 closed

80487SX

closed

pins 2 & 3 closed

pins 1 & 2 closed

80486SX

open

open

pins 2 & 3 closed

SRAM JUMPER CONFIGURATION

Jumper

64KB

128KB

256KB

SR1

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

SR2

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

SR3

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

SR4

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

SR5

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

SR6

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

SRAM CONFIGURATION

Size

Cache SRAM

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

(1) 32K x 8