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A4870 VER. 2.0

ABC COMPUTER COMPANY, LTD.

A4870 VER. 2.0

Processor

80486DX

Processor Speed

33MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330.2mm x 218.4mm

I/O Options

32-bit external memory card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Speaker

J10

Turbo switch

J7

Power LED & keylock

J11

Turbo LED

J8

32-bit external memory card

S1

Reset switch

J9

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J4

pins 1 & 2 closed

 

CMOS memory clear

J4

pins 2 & 3 closed

Monitor type select color

J5

Closed

 

Monitor type select monochrome

J5

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 CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(4) 4K 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

W3

W4

W5

W6

W7

W8

64KB

1 & 2

Open

Open

2 & 3

1 & 2

1 & 2

128KB

2 & 3

1 & 2

Open

2 & 3

1 & 2

1 & 2

256KB

1 & 2

2 & 3

Open

2 & 3

2 & 3

2 & 3

Note:Pins designated should be in closed position.