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A3875

ABC COMPUTER COMPANY, LTD.

A3875

Processor

80386DX

Processor Speed

25/33/40MHz

Chip Set

Forex

Max. Onboard DRAM

32MB

Cache

32/64/128KB

BIOS

AMI

Dimensions

332mm x 218mm

I/O Options

None

NPU Options

80387/3167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J3

Turbo switch

J10

Reset switch

J8

Speaker

J11

Turbo LED

J9

Power LED & keylock

J12

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

J1

Closed

 

Monitor type select monochrome

J1

Open

External battery select 3.6VDC

J4

Closed

 

External battery select 6VDC

J4

Open

CMOS memory normal operation

J5

Open

 

CMOS memory clear

J5

Closed

NPU mode select synchronous with CPU

J6

pins 1 & 2 closed

 

NPU mode select asynchronous with CPU

J6

pins 2 & 3 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 (U41)

TAG (U42)

32KB

(4) 8K x 8

NONE

(1) 8K x 8

NONE

64KB

(4) 8K x 8

(4) 8K x 8

(2) 8K x 8

(2) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 32K x 8

NONE

Note: Bank 0 = U44, U46, U48 & U50

CACHE JUMPER CONFIGURATION

Size

J7

32KB

pins 1 & 2 closed

64KB

pins 2 & 3 closed

128KB

pins 2 & 3 closed