Processor

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

Processor Speed

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

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

game port, IDE interface, parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

J10

Game port

J2

Turbo switch

J11

Parallel port

J4

Reset switch

J12

Serial port 1

J5

Speaker

J13

Serial port 2

J6

Power LED & keylock

J14

Floppy drive interface

J8

IDE LED connector

JP12

IDE interface connector

J9

32-bit VESA Local bus slots

S1 & S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Game port enabled

JP1

pins 1 & 2 closed

Game port disabled

JP1

pins 2 & 3 closed

»

Floppy drive interface enabled

JP6

pins 1 & 2 closed

Floppy drive interface disabled

JP6

pins 2 & 3 closed

»

Monitor type select color

JP13

pins 2 & 3 closed

Monitor type select monochrome

JP13

pins 1 & 2 closed

SERIAL PORT CONFIGURATION

Port 1 (J5)

Port 2 (J6)

JP3

JP7

JP8

JP9

»

COM1

COM2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

COM1

Disabled

pins 2 & 3

N/A

pins 1 & 2

pins 1 & 2

Disabled

COM2

pins 1 & 2

pins 1 & 2

N/A

pins 2 & 3

COM3

COM4

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 1 & 2

COM3

Disabled

pins 2 & 3

N/A

pins 2 & 3

pins 1 & 2

Disabled

COM4

pins 1 & 2

pins 2 & 3

N/A

pins 2 & 3

Disabled

Disabled

pins 2 & 3

N/A

N/A

pins 2 & 3

Note:Pins designated should be in the closed position.

PARALLEL PORT CONFIGURATION

Port

LPT

JP2

JP4

Enabled

LPT2

pins 1 & 2 closed

pins 1 & 2 closed

Disabled

LPT3

pins 2 & 3 closed

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

5MB

(4) 256K x 9

(4) 1M x 9

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

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP22

JP23

JP27

JP28

64KB

pins 1 & 2 closed

Open

Open

pins 1 & 2 closed

128KB

pins 2 & 3 closed

Open

Closed

pins 2 & 3 closed

256KB

pins 1 & 2 closed

Closed

Closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

JP24

JP25

JP26

80486SX

N/A

pins 2 & 3 closed

Open

80486SX (PQFP)

Open

N/A

N/A

80487SX

N/A

pins 1 & 2 and 3 & 4

pins 2 & 3 closed

80486DX

N/A

pins 1 & 2 and 3 & 4

pins 1 & 2 closed

80486DX2

N/A

pins 1 & 2 and 3 & 4

pins 1 & 2 closed

Pentium Overdrive

N/A

pins 1 & 2 and 3 & 4

pins 2 & 3 closed

CPU SPEED CONFIGURATION

Speed

JP18

JP19

JP20

JP21

25MHz

Closed

Closed

Open

Open

33MHz

Open

Closed

Open

Open

50i MHz

Closed

Closed

Open

Open

50MHz

Open

Open

Open

Open

66i MHz

Open

Closed

Open

Open

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP15

JP16

£ 33MHz

0 wait states

Open

Open

> 33MHz

1 wait state

Closed

Closed

IDE CONFIGURATION

Setting

JP5

JP10

Enabled

pins 1 & 2 closed

pins 1 & 2 closed

Disabled

pins 2 & 3 closed

pins 2 & 3 closed