Abit FU3 Version 2

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Despite listing support for up to 256kb cache and 32MB of system RAM, the board only seems to support 128kb cache and 16MB DRAM without becoming unstable. Newer revisions of the board may have BIOS and hardware support for Cyrix 486DLC type chips. The CHIPs PEAK/DM chipset provides brisk main memory performance, but sadly the bank interleave mode was not implemented on this motherboard.

Silicon Star FU3.JPG


Processor

80386DX

Processor Speed

25/33/40MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

32MB

Maximum Video Memory

None

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80387DX/3167

File:35096-1.png

CONNECTIONS
Purpose Location Purpose Location

Turbo LED

D4

Turbo switch

J50

Speaker

J18

Reset switch

J51

Power LED & keylock

J19

External battery

JP2

USER CONFIGURABLE SETTINGS
Function Label Position

�

Factory configured - do not alter

J21

Open

�

Monitor type select monochrome

J23

Open

Monitor type select color

J23

Closed

�

CMOS memory normal operation

J42

Pins 2 & 3 closed

CMOS memory clear

J42

Pins 1 & 2 closed

�

Factory configured - do not alter

JP10

Unidentified

�

Factory configured - do not alter

JP11

Unidentified

�

Factory configured - do not alter

JP30

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

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

(1) 8K x 8

64KB

(4) 8K x 8

(4) 8K x 8

(2) 16K x 4

128KB

(4) 32K x 8

None

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(2) 64K x 4

Note: The location of banks 0 & 1 and TAG are unidentified.

CACHE JUMPER CONFIGURATION
Size J26 J27 J28 J29

32KB

Pins 1 & 2 closed

Open

Open

Closed

64KB

Pins 1 & 2 closed

Closed

Open

Closed

128KB

Pins 2 & 3 closed

Closed

Open

Closed

256KB

Pins 2 & 3 closed

Closed

Closed

Open

CACHE JUMPER CONFIGURATION (CON'T)
Size J33 J34 J35 J36 J37

32KB

Closed

Open

2 & 3

2 & 3

2 & 3

64KB

Closed

1 & 2

Open

2 & 3

2 & 3

128KB

Open

1 & 2

Open

1 & 2

1 & 2

256KB

Open

1 & 2

1 & 2

1 & 2

1 & 2

Note: Pins designated should be in the closed position.

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

32KB

Open

Pins 2 & 3 closed

Open

Pins 1 & 2 closed

64KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Open

Pins 1 & 2 closed

128KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

256KB

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 2 & 3 closed