Processor

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

Processor Speed

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

Chip Set

OPTi

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-Bit VESA local bus slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo switch

JP28

Power LED & keylock

J5

32-bit VESA Local bus slot

S1

Speaker

J6

32-bit VESA Local bus slot

S2

Turbo LED

JP24

Reset switch

SW1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

JP1

Closed

Monitor type select monochrome

JP1

Open

»

Factory configured - do not alter

JP32

pins 2 & 3 closed

»

ADS # signal delay enabled

JP40

pins 2 & 3 closed

ADS # signal delay disabled

JP40

pins 1 & 2 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) 16K x 8/(1) 32K x 8

Note:The exact locations of Bank 0 and Bank 1 are unknown.

CACHE JUMPER CONFIGURATION

Size

JP7

JP9

JP15

JP22

64KB

pins 2 & 3 closed

Open

Open

Open

128KB

pins 1 & 2 closed

Closed

Closed

Open

256KB

pins 2 & 3 closed

Closed

Closed

Closed

Note:The exact locations of Bank 0 and Bank 1 are unknown.

CPU TYPE CONFIGURATION

Type

JP11

JP12

80486SX

Open

pins 2 & 3 closed

80487SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

80486DX2

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

Pentium Overdrive

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

CPU SPEED CONFIGURATION

Speed

JP10

JP16

JP23

25MHz

Open

pins 2 & 3 closed

Closed

33MHz

Closed

pins 2 & 3 closed

Open

40MHz

Open

pins 2 & 3 closed

Open

50i MHz

Open

pins 2 & 3 closed

Closed

50MHz

Open

pins 1 & 2 closed

Closed

66i MHz

Closed

pins 2 & 3 closed

Open

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

J20

J21

< 33MHz

0 wait states

Closed

Closed

> 33MHz

1 wait state

Open

Open

VL-BUS MASTER/SLAVE CONFIGURATION

Setting

JP13

JP18

»

Slave mode

Closed

Open

Master & slave

Closed

Open

Note:For VL-Bus device to support both master and slave mode, an additional PAL must be inserted in U43

VL-BUS SETUP MODE CONFIGURATION

Setting

JP29

JP39

»

Setup 0

pins 1 & 2 closed

pins 1 & 2 closed

Setup 1

pins 1 & 2 closed

pins 2 & 3 closed

Setup 2

pins 2 & 3 closed

pins 2 & 3 closed