Abit FU3 Version 1

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

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.