AMERICAN DIGITAL DATA ASSOCIATES

Precision 486-25

Processor

80486DX

Processor Speed

25MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

64/128KB (on 32-bit external cache card)

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot, 32-bit external cache card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

BAT

Speaker

J25

32-bit external memory card

CN1

Power LED & keylock

J26

32-bit external cache card

CN2

Reset switch

SW1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

ยป

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) 256K x 9

(4) 1M 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

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CARD CONFIGURATION

Setting

JP3

JP4

Disabled

Closed

Closed

Enabled

Open

Open

CACHE CONFIGURATION

Size

Bank 0

Bank 1

64KB

(8) 8K x 8

NONE

128KB

(8) 8K x 8

(8) 8K x 8

CACHE JUMPER CONFIGURATION

Size

JP1

JP2

JP3

JP4

JP5

64KB

1 & 2

Open

Open

1 & 2

1 & 2

128KB

2 & 3

Closed

Closed

2 & 3

2 & 3

Note: Pins designated should be in the closed position.