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