Processor

80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

C & T

Max. Onboard DRAM

128MB

Cache

128/256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP2

Turbo switch

JP19

Green PC power connector

JP3

Green PC switch

JP20

Power LED & keylock

JP16

Turbo LED

JP21

Speaker

JP17

Reset switch

JP26

Green PC LED

JP18

32-bit VESA local bus slots

S1, S2 & S3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CMOS memory normal operation

JP1

pins 1 & 2 closed

CMOS memory clear

JP1

pins 2 & 3 closed

»

Monitor type select color

JP4

Closed

Monitor type select monochrome

JP4

Open

»

Flash BIOS write protect enabled

JP5

pins 1 & 2 closed

Flash BIOS write protect disabled

JP5

pins 2 & 3 closed

»

CPU manufacturer type - Intel

JP15

pins 1 & 2 closed

CPU manufacturer type - Cyrix

JP15

pins 2 & 3 closed

»

Factory configured - do not alter

JP24

N/A

»

Factory configured - do not alter

JP25

N/A

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 1M x 9

NONE

2MB

(4) 1M x 9

(4) 1M x 9

4MB

(4) 4M x 9

NONE

8MB

(4) 4M x 9

(4) 4M x 9

16MB

(4) 16M x 9

NONE

20MB

(4) 4M x 9

(4) 16M x 9

32MB

(4) 16M x 9

(4) 16M x 9

64MB

(4) 64M x 9

NONE

128MB

(4) 64M x 9

(4) 64M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

512KB

(4) 128K x 8

NONE

(1) 128K x 8

1MB

(4) 128K x 8

(4) 128K x 8

(1) 128K x 8

CACHE JUMPER CONFIGURATION

Size

JP11

JP12

256KB

pins 1 & 2 closed

pins 1 & 2 closed

512KB

pins 2 & 3 closed

pins 2 & 3 closed

1MB

pins 2 & 4 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP8

JP9

JP10

80486SX

pins 2 & 3 closed

Open

Open

80487SX

pins 1 & 2 , 3 & 4 closed

Open

Open

80486DX

pins 1 & 2 , 3 & 4 closed

pins 2 & 3 closed

Open

80486DX2

pins 1 & 2 , 3 & 4 closed

pins 2 & 3 closed

Open

Pentium Overdrive

pins 1 & 2 , 3 & 4 closed

pins 1 & 2 closed

Closed

CPU SPEED CONFIGURATION

Speed

JP13

JP14

JP27

JP28

25MHz

Closed

pins 1 & 2 closed

pins 2 & 4 closed

pins 2 & 3 closed

33MHz

Open

pins 1 & 2, 5 & 6

pins 2 & 4 closed

pins 2 & 3 closed

40MHz

Open

pins 1 & 2, 3 & 4

pins 1 & 2 closed

pins 1 & 2 closed

50iMHz

Closed

pins 1 & 2 closed

pins 2 & 4 closed

pins 2 & 3 closed

50MHz

Open

1 & 2, 3 & 4, 5 & 6

pins 1 & 2 closed

pins 1 & 2 closed

66IMHz

Open

pins 1 & 2, 5 & 6

pins 2 & 4 closed

pins 2 & 3 closed

Note: Pins designated should be in the closed position.

VESA WAIT STATE/BUS SPEED (ID2 & ID3) CONFIGURATION

CPU speed

Wait states

JP22 (ID3)

JP23 (ID2)

£ 33MHz

0 wait states

Closed

Open

> 33MHz

1 wait state

Open

Closed