Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

20/25/33/40/50(internal)/50/66(internal)MHz

Chip Set

OPTI

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

External keyboard

J2

Green PC

JP38

External battery

J4

32 Bit VESA slots

S1 & S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select monochrome

JP17

Open

Monitor type select color

JP17

Closed

»

Factory configured - do not alter

JP18

Closed

»

Factory configured - do not alter

JP22

pins 1 & 2 closed

»

Factory configured - do not alter

JP23

pins 1 & 2 closed

»

Factory configured - do not alter

JP26

pins 1 & 2 closed

»

Factory configured - do not alter

JP37

pins 1 & 2 closed

PIN OUT CONFIGURATION

Function

J5

Keylock

pins 3 & 5 closed

Power LED

pins 1 & 2 closed

Speaker

pins 7 , 8 , 9 & 10 closed

Turbo LED

pins 12 & 13 closed

Turbo switch

pins 15, 16 & 17 closed

Reset switch

pins 19 & 20 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 3

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

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 256K x 9

(4) 4M x 9

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M 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

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP1

JP6

JP7

64KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

128KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 4 & 5 closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

JP31

JP32

JP33

80486SX

pins 3 & 4 closed

Open

pins 2 & 3 , 4 & 5 closed

80486SX (PQFP)

Open

Open

pins 1 & 2 closed

80487SX

pins 2 & 3 , 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3 , 4 & 5 closed

80486DX

pins 2 & 3 , 4 & 5 closed

pins 2 & 3 closed

pins 2 & 3 , 4 & 5 closed

80486DX (PQFP)

pins 1 & 2 closed

pins 4 & 5 closed

pins 1 & 2 closed

ODP486SX

pins 2 & 3 , 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3 , 4 & 5 closed

80486DX2

pins 2 & 3 , 4 & 5 closed

pins 2 & 3 closed

pins 2 & 3 , 4 & 5 closed

Pentium Overdrive

pins 2 & 3 , 4 & 5 closed

pins 1 & 2 closed

pins 2 & 3 , 4 & 5 closed

CPU SPEED CONFIGURATION

Speed

OSC.

JP8

JP12

JP13

JP14

20MHz

40MHz

pins 2 & 3 closed

Closed

Closed

Open

25MHz

25MHz

pins 2 & 3 closed

Open

Open

Closed

33MHz

33MHz

pins 1 & 2 closed

Closed

Open

Open

50i MHz

25MHz

pins 2 & 3 closed

Open

Open

Closed

50MHz

50MHz

pins 1 & 2 closed

Open

Closed

Open

66i MHz

33MHz

pins 1 & 2 closed

Closed

Open

Open

VESA WAIT STATE/BUS SPEED CONFIGURATION

CPU speed

Wait states

JP19

JP20

<=33MHz

0 wait states

Open

Open

>33MHz

1 wait state

Closed

Closed