Processor

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

Processor Speed

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

Chip Set

EFAR

Max. Onboard DRAM

32MB

SRAM Cache

128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo LED

JP3

Reset switch

JP9

Speaker

JP7

Turbo switch

JP10

Power LED & keylock

JP8

32-bit Vesa local bus slots

S1 & S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP11

Open

»

Monitor type select color

JP26

Open

Monitor type select monochrome

JP27

Closed

»

Factory configured - do not alter

JP27

pins 2 & 3 closed

»

Factory configured - do not alter

JP28

pins 2 & 3 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

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Cache

Location

TAG

128KB

(4) 32K x 8

Bank 0

(1) 32K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP14

JP16

JP22

128KB

pins 2 & 3 closed

Open

pins 2 & 3 closed

256KB

pins 1 & 2 closed

Closed

pins 1 & 2 closed

VESA CPU TYPE (ID0 & ID1) CONFIGURATION

CPU Type

JP1 (ID0)

JP2 (ID1)

80386

pins 2 & 3 closed

pins 1 & 2 closed

80486

pins 1 & 2 closed

pins 2 & 3 closed

VESA WAIT STATE (ID2) CONFIGURATION

Wait states

CPU speed

JP4 (ID2)

0 wait states

£ 33MHz

pins 1 & 2 closed

1 wait state

> 33MHz

pins 2 & 3 closed

VESA BUS SPEED (ID3) CONFIGURATION

CPU speed

JP5 (ID3)

£ 33MHz

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed

VESA ID4 CONFIGURATION

Setting

JP6 (ID4)

Reserved for future use

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

Speed

OSC

JP12

JP13

JP18

JP19

80486SX

20MHz

20MHz

pins 2 & 3

Open

Open

pins 2 & 3

80486SX

20MHz

40MHz

pins 2 & 3

Open

Open

pins 1 & 2

80486SX

25MHz

25MHz

pins 2 & 3

Open

Open

pins 2 & 3

80486SX

25MHz

50MHz

pins 2 & 3

Open

Open

pins 1 & 2

80487SX

25MHz

25MHz

pins 1 & 2

Closed

pins 2 & 3

pins 2 & 3

80487SX

25MHz

50MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

80487SX

33MHz

66MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

80486DX

25MHz

25MHz

pins 1 & 2

Closed

pins 2 & 3

pins 2 & 3

80486DX

25MHz

50MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

80486DX

33MHz

66MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

80486DX

50MHz

50MHz

pins 1 & 2

Closed

pins 2 & 3

pins 2 & 3

ODP486SX

50MHz

25MHz

pins 2 & 3

Open

Open

pins 2 & 3

ODP486SX

50iMHz

50MHz

pins 2 & 3

Open

Open

pins 1 & 2

80486DX2

50iMHz

50MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

80486DX2

66iMHz

66MHz

pins 1 & 2

Closed

pins 2 & 3

pins 1 & 2

Notes: Pins designated should be in the closed position.