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A4872

ABC COMPUTER COMPANY, LTD.

A4872

Processor

80486DX

Processor Speed

33MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Reset switch

J9

Turbo LED

J7

Speaker

J10

Turbo switch

J8

Power LED & keylock

J11

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

J4

Closed

 

Monitor type select monochrome

J4

Open

Factory configured - do not alter

J5

Open

CMOS memory normal operation

J6

pins 1 & 2 closed

 

CMOS memory clear

J6

pins 2 & 3 closed

Factory configured - do not alter

W1

pins 1 & 2 closed

Factory configured - do not alter

W2

pins 1 & 2 closed

Factory configured - do not alter

W3

pins 1 & 2 closed

Factory configured - do not alter

W4

pins 1 & 2 closed

Factory configured - do not alter

W5

pins 2 & 3 closed

Factory configured - do not alter

W10

Open

Factory configured - do not alter

W11

Open

Factory configured - do not alter

W15

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) 1 M 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

64KB

(4) 8K x 8

(4) 8K x 8

(4) 16K x 4

128KB

(4) 32K x 8

NONE

(4) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(4) 16K x 4

CACHE JUMPER CONFIGURATION

Size

W6

W7

W8

W9

64KB

pins 1 & 2 closed

pins 1 & 2 closed

Open

pins 1 & 2 closed

128KB

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

CPU TYPE CONFIGURATION

Type

W12

W13

W14

80486SX

Open

pins 2 & 3 closed

Open

80487SX

Closed

pins 1 & 2 closed

pins 2 & 3 closed

80486DX

Closed

pins 1 & 2 closed

pins 1 & 2 closed