Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

25/33/50(Internal)/50/66(Internal)MHz

Chip Set

SIS

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (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 local bus slots

S1 & S2

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

»

Factory configured do not alter

JP9

Pins 1 & 2 closed

»

Factory configured do not alter

JP14

Pins 1 & 2 closed

»

Factory configured do not alter

JP15

Open

»

Factory configured do not alter

JP16

Open

»

Factory configured do not alter

JP24

Pins 2 & 3 open

»

Factory configured do not alter

JP25

Pins 1 & 2 open

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

CACHE 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

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

SR1

SR2

SR3

SR4

SR5

SR6

64KB

Pins 2 & 3

Pins 2 & 3

Pins 1 & 2

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

128KB

Pins 1 & 2

Pins 1 & 2

Pins 2 & 3

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

Pins 2 & 3

NotePins 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

Closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX2

Closed

Pins 1 & 2 closed

Pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP10

JP11

JP12

JP13

25MHz

Pins 2 & 3

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

33MHz

Pins 1 & 2

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

50iMHz

Pins 2 & 3

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

50MHz

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

66iMHz

Pins 1 & 2

Pins 2 & 3

Pins 1 & 2

Pins 1 & 2

NotePins designated should be in the closed position.

VESA CPU TYPE (ID0 & ID1) CONFIGURATION

CPU TYPE

JP24 (ID0)

JP25 (ID1)

80386

Pins 2 & 3 closed

Pins 1 & 2 closed

80486

Pins 2 & 3 closed

Pins 1 & 2 closed

VESA WAIT STATE (ID2) CONFIGURATION

Wait states

CPU Speed

JP26

0 wait states

£ 33MHz

Pins 1 & 2 closed

1 wait state

> 33MHz

Pins 2 & 3 closed

VESA WAIT STATE (ID2) CONFIGURATION

CPU Speed

JP27

<= 33MHz

Pins 1 & 2 closed

> 33MHz

Pins 2 & 3 closed