Abit FU3 Version 1

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ABIT COMPUTER CORPORATION

FU3

Processor

80386SX

Processor Speed

25/33MHz

Chip Set

C & T

Max. Onboard DRAM

32MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80387SX/3167

File:35078-1.png

CONNECTIONS
Purpose Location Purpose Location

Turbo LED

D4

Power LED & keylock

J19

External battery

JP2

Turbo switch

J50

Speaker

J18

Reset switch

J51

USER CONFIGURABLE SETTINGS
Function Jumper Position

�

Factory configured - do not alter

J21

Open

�

Fast gate A20 enabled

J22

Closed

Fast gate A20 disabled

J22

Open

�

Monitor type select color

J23

Closed

Monitor type select monochrome

J23

Open

�

CMOS memory normal operation

J42

pins 2 & 3 closed

CMOS memory clear

J42

pins 1 & 2 closed

�

Factory configured - do not alter

JP1

N/A

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION
Size Bank 0 Bank 1 TAG

32KB

(4) 8K x 8

NONE

(2) 16K x 8

64KB

(4) 8K x 8

(4) 8K x 8

(2) 16K x 8

128KB

(4) 32K x 8

NONE

(2) 64K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(2) 64K x 8

CACHE JUMPER CONFIGURATION
Size J26 J27 J28 J29 J33 J34 J35

32KB

1 & 2

Open

Open

Closed

Closed

1 & 2

2 & 3

64KB

1 & 2

1 & 2

Open

Closed

Closed

Open

1 & 2

128KB

2 & 3

1 & 2

2 & 3

Closed

Open

1 & 2

1 & 2

256KB

2 & 3

1 & 2

1 & 2

Open

Open

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION( CON'T)
Size J36 J37 J38 J39 J41 J52 J60

32KB

2 & 3

2 & 3

Open

2 & 3

Open

1 & 2

Open

64KB

2 & 3

2 & 3

1 & 2

1 & 2

Open

1 & 2

Open

128KB

1 & 2

1 & 2

2 & 3

2 & 3

Closed

2 & 3

Open

256KB

1 & 2

1 & 2

2 & 3

1 & 2

Closed

2 & 3

Closed

Note: Pins designated should be in the closed position. The locations of J52 & J60 are unidentified.