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Precision 486-25

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

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.