ABC A3866

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ABC COMPUTER COMPANY, LTD.

A3866

Processor

80386DX

Processor Speed

33/40MHz

Chip Set

OPTI

Max. Onboard DRAM

20MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

NPU Options

80387/3167

File:30071-1.png

CONNECTIONS
Purpose Location Purpose Location

External battery

J10

32-bit external memory card

S1

Power LED & keylock

J23

Reset switch

SW1

Speaker

J24

Turbo switch

SW2

Turbo LED

JP4

USER CONFIGURABLE SETTINGS
Function Jumper Position
�

Monitor type select color

JP1

Closed

Monitor type select monochrome

JP1

Open

�

CMOS memory normal operation

JP2

pins 2 & 3 closed

CMOS memory clear

JP2

pins 1 & 2 closed

DRAM CONFIGURATION
Size Bank 0 Bank 1 Bank 2 Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 256K x 9

(4) 1 M x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 1M x 9

NONE

NONE

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

17MB

(4) 4M x 9

(4) 256K x 9

NONE

NONE

20MB

(4) 4M x 9

(4) 1M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

Note:Banks 2 & 3 are used when a 32-bit external memory card is installed.

CACHE CONFIGURATION
Size Bank 0 Bank 1 Tag

64KB

(4) 8K x 8

(4) 8K x 8

(3) 16K x 4

128KB

(4) 32K x 8

NONE

(3) 16K x 4

256KB

(4) 32K x 8

(4) 32K x 8

(3) 16K x 4

CACHE JUMPER CONFIGURATION
Size JP5 JP6 JP7 JP8 JP9

64KB

2 & 3

1 & 2

1 & 2

Open

2 & 3

128KB

2 & 3

1 & 2

2 & 3

Closed

2 & 3

256KB

2 & 3

2 & 3

2 & 3

Closed

1 & 2

Note: Pins designated should be in the closed position.