Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

260mm x 220mm

I/O Options

32-bit VESA slots (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo switch

JP28

Power LED & keylock

J5

32-bit VESA slots (2)

S1 & S2

Speaker

J6

Reset switch

SW1

Turbo LED

JP24

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Battery select internal

J1

pins 1 & 2 closed

Battery select external

J1

pins 2 & 3 closed

»

Monitor type select color

JP1

Closed

Monitor type select monochrome

JP1

Open

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) 1M x 9

(4) 256K 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

CPU JUMPER CONFIGURATION/CLOCK GENERATOR IN U45

CPU Type

JP10

JP11

JP12

JP16

JP23

80486SX-25

Open

Open

pins 2 & 3

pins 2 & 3

Closed

80486SX-33

Closed

Open

pins 2 & 3

pins 2 & 3

Open

80487SX-25

Open

pins 2 & 3

pins 1 & 2, 3 & 4

pins 2 & 3

Closed

80486DX-25

Open

pins 1 & 2

pins 1 & 2. 3 & 4

pins 2 & 3

Closed

80486DX-33

Closed

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

Open

80486DX-50

Open

pins 1 & 2

pins 1 & 2, 3 & 4

pins 1 & 2

Closed

80486DX2-50

Open

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

Closed

80486DX2-66

Closed

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

Open

Note:Pins designated should be in the closed position.

CPU JUMPER CONFIGURATION/OSCILLATOR IN U45

CPU Type

JP11

JP12

JP16

80486SX-25

Open

pins 2 & 3

pins 2 & 3

80486SX-33

Open

pins 2 & 3

pins 2 & 3

80487SX-25

pins 2 & 3

pins 1 & 2, 3 & 4

pins 2 & 3

80486DX-25

pins 1 & 2

pins 1 & 2. 3 & 4

pins 2 & 3

80486DX-33

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

80486DX-50

pins 1 & 2

pins 1 & 2, 3 & 4

pins 1 & 2

80486DX2-50

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

80486DX2-66

pins 1 & 2

pins 1 & 2, 3 & 4

pins 2 & 3

Note:Pins designated should be in the closed position.

CACHE CONFIGURATION

Size

Cache

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

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

VESA BUS SPEED AND WAIT STATE CONFIGURATION

CPU speed

Wait states

J20

J21

£ 33MHz

0 wait states

Closed

Closed

> 33MHz

1 wait state

Open

Open