AH4 Motherboard Settings and Configuration

ABIT COMPUTER CORPORATION

AH4

Processor
80486SX/80486DX/CX486DX2/80486DX2
Processor Speed
20/25/33/40/50(internal)/66(internal)MHz
Chip Set
SIS
Max. Onboard DRAM
128MB
Cache
128/256/512KB
BIOS
Award
Dimensions
330mm x 218mm
I/O Options
32-bit VESA local bus slots (2), green PC connector
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J1
Reset switch
JW3
Green PC connector
JP45 (pins 7 - 8)
Turbo LED
JW4
Power LED & keylock
JW1
Turbo switch
JW5
Speaker
JW2
32-bit VESA local bus slots
SL1 - SL3

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Factory configured - do not alter
J2
Open
»
CMOS memory normal operation
JP16
pins 1 & 2 closed

CMOS memory clear
JP16
pins 2 & 3 closed
»
Monitor type select color
JP17
Closed

Monitor type select monochrome
JP17
Open
»
Factory configured - do not alter
JP19
Open
»
Factory configured - do not alter
JP26
Open
»
Factory configured - do not alter
JP30
Open
»
Factory configured - do not alter
JP31
Open
»
Factory configured - do not alter
JP42
Open

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(1) 256K x 36
NONE
NONE
NONE
2MB
(1) 256K x 36
(1) 256K x 36
NONE
NONE
2MB
(1) 512K x 36
NONE
NONE
NONE
4MB
(1) 512K x 36
(1) 512K x 36
NONE
NONE
4MB
(1) 1M x 36
NONE
NONE
NONE
4MB
(1) 256K x 36
(1) 256K x 36
(1) 512K x 36
NONE
5MB
(1) 256K x 36
(1) 1M x 36
NONE
NONE
6MB
(1) 256K x 36
(1) 256K x 36
(1) 1M x 36
NONE
6MB
(1) 512K x 36
(1) 1M x 36
NONE
NONE
8MB
(1) 256K x 36
(1) 256K x 36
(1) 512K x 36
(1) 1M x 36
8MB
(1) 512K x 36
(1) 512K x 36
(1) 1M x 36
NONE
8MB
(1) 1M x 36
(1) 1M x 36
NONE
NONE
8MB
(1) 2M x 36
NONE
NONE
NONE
10MB
(1) 256K x 36
(1) 256K x 36
(1) 1M x 36
(1) 1M x 36
12MB
(1) 512K x 36
(1) 512K x 36
(1) 1M x 36
(1) 1M x 36
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
NONE
16MB
(1) 2M x 36
(1) 2M x 36
NONE
NONE
16MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
16MB
(1) 4M x 36
NONE
NONE
NONE
17MB
(1) 256K x 36
(1) 4M x 36
NONE
NONE
18MB
(1) 256K x 36
(1) 256K x 36
(1) 4M x 36
NONE
20MB
(1) 512K x 36
(1) 512K x 36
(1) 4M x 36
NONE
20MB
(1) 1M x 36
(1) 4M x 36
NONE
NONE
24MB
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
NONE
24MB
(1) 512K x 36
(1) 512K x 36
(1) 1M x 36
(1) 4M x 36
24MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
NONE
32MB
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
(1) 2M x 36
32MB
(1) 4M x 36
(1) 4M x 36
NONE
NONE
32MB
(1) 8M x 36
NONE
NONE
NONE
36MB
(1) 512K x 36
(1) 512K x 36
(1) 4M x 36
(1) 4M x 36
36MB
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
NONE

DRAM CONFIGURATION (CON’T)
Size
Bank 0
Bank 1
Bank 2
Bank 3
36MB
(1) 1M x 36
(1) 8M x 36
NONE
NONE
40MB
(1) 1M x 36
(1) 1M x 36
(1) 4M x 36
(1) 4M x 36
40MB
(1) 1M x 36
(1) 1M x 36
(1) 8M x 36
NONE
48MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
NONE
48MB
(1) 4M x 36
(1) 8M x 36
NONE
NONE
64MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
64MB
(1) 16M x 36
NONE
NONE
NONE
64MB
(1) 4M x 36
(1) 4M x 36
(1) 8M x 36
NONE
64MB
(1) 8M x 36
(1) 8M x 36
NONE
NONE
65MB
(1) 256K x 36
(1) 16M x 36
NONE
NONE
68MB
(1) 1M x 36
(1) 16M x 36
NONE
NONE
68MB
(1) 1M x 36
(1) 8M x 36
(1) 8M x 36
NONE
72MB
(1) 1M x 36
(1) 1M x 36
(1) 16M x 36
NONE
72MB
(1) 1M x 36
(1) 1M x 36
(1) 8M x 36
(1) 8M x 36
80MB
(1) 4M x 36
(1) 16M x 36
NONE
NONE
80MB
(1) 4M x 36
(1) 8M x 36
(1) 8M x 36
NONE
96MB
(1) 4M x 36
(1) 4M x 36
(1) 16M x 36
NONE
96MB
(1) 4M x 36
(1) 4M x 36
(1) 8M x 36
(1) 8M x 36
96MB
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36
NONE
128MB
(1) 16M x 36
(1) 16M x 36
NONE
NONE
128MB
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36
(1) 8M x 36

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
128KB
(4) 32K x 8
NONE
(1) 8K x 8
256KB
(4) 32K x 8
(4) 32K x 8
(1) 32K x 8
256KB
(4) 64K x 8
NONE
(1) 32K x 8
512KB
(4) 64K x 8
(4) 64K x 8
(1) 32K x 8
512KB
(4) 128K x 8
NONE
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
JP1
JP2
JP4
JP40
JP41
128KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
2 & 3
1 & 2
2 & 3
2 & 3
256KB
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
512KB
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
512KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type
JP8
JP9
JP11
JP12
JP14
JP15
80486SX
2 & 3
Open
Open
3 & 4
2 & 3
4 & 5
CX486DX
1 & 2
Closed
2 & 3
2 & 3
1 & 2, 3 & 4
2 & 3
80486DX
1 & 2
Closed
2 & 3
3 & 4
2 & 3
4 & 5
80486DX2
1 & 2
Closed
2 & 3
3 & 4
2 & 3
4 & 5
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON’T)
Type
JP21
JP22
JP24
JP25
JP46
80486SX
2 & 3
1 & 2
Open
Open
2 & 3
CX486DX
1 & 2
2 & 3
2 & 3
2 & 3
1 & 2
80486DX
2 & 3
1 & 2
Open
Open
2 & 3
80486DX2
2 & 3
1 & 2
Open
Open
2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed
JP5
JP6
JP7
JP20
20MHz
Closed
Open
Closed
pins 1 & 2 closed
25MHz
Closed
Closed
Open
pins 1 & 2 closed
33MHz
Open
Closed
Closed
pins 1 & 2 closed
40MHz
Closed
Open
Open
pins 2 & 3 closed
50iMHz
Closed
Closed
Open
pins 1 & 2 closed
66iMHz
Open
Closed
Closed
pins 1 & 2 closed

BUS SPEEDCONFIGURATION
CPU speed
JP29
<=33MHz
pins 1 & 2 closed
>33MHz
pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION
Wait states
JP28
0 wait states
pins 1 & 2 closed
1 wait state
pins 2 & 3 closed

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AH4 Motherboard Settings and Configuration

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Processor	80486SX/80486DX/CX486DX2/80486DX2
Processor Speed	20/25/33/40/50(internal)/66(internal)MHz
Chip Set	SIS
Max. Onboard DRAM	128MB
Cache	128/256/512KB
BIOS	Award
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2), green PC connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Reset switch	JW3
Green PC connector	JP45 (pins 7 - 8)	Turbo LED	JW4
Power LED & keylock	JW1	Turbo switch	JW5
Speaker	JW2	32-bit VESA local bus slots	SL1 - SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	J2	Open
»	CMOS memory normal operation	JP16	pins 1 & 2 closed
	CMOS memory clear	JP16	pins 2 & 3 closed
»	Monitor type select color	JP17	Closed
	Monitor type select monochrome	JP17	Open
»	Factory configured - do not alter	JP19	Open
»	Factory configured - do not alter	JP26	Open
»	Factory configured - do not alter	JP30	Open
»	Factory configured - do not alter	JP31	Open
»	Factory configured - do not alter	JP42	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	NONE	NONE	NONE
2MB	(1) 256K x 36	(1) 256K x 36	NONE	NONE
2MB	(1) 512K x 36	NONE	NONE	NONE
4MB	(1) 512K x 36	(1) 512K x 36	NONE	NONE
4MB	(1) 1M x 36	NONE	NONE	NONE
4MB	(1) 256K x 36	(1) 256K x 36	(1) 512K x 36	NONE
5MB	(1) 256K x 36	(1) 1M x 36	NONE	NONE
6MB	(1) 256K x 36	(1) 256K x 36	(1) 1M x 36	NONE
6MB	(1) 512K x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 256K x 36	(1) 256K x 36	(1) 512K x 36	(1) 1M x 36
8MB	(1) 512K x 36	(1) 512K x 36	(1) 1M x 36	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 2M x 36	NONE	NONE	NONE
10MB	(1) 256K x 36	(1) 256K x 36	(1) 1M x 36	(1) 1M x 36
12MB	(1) 512K x 36	(1) 512K x 36	(1) 1M x 36	(1) 1M x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
16MB	(1) 2M x 36	(1) 2M x 36	NONE	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	NONE	NONE	NONE
17MB	(1) 256K x 36	(1) 4M x 36	NONE	NONE
18MB	(1) 256K x 36	(1) 256K x 36	(1) 4M x 36	NONE
20MB	(1) 512K x 36	(1) 512K x 36	(1) 4M x 36	NONE
20MB	(1) 1M x 36	(1) 4M x 36	NONE	NONE
24MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	NONE
24MB	(1) 512K x 36	(1) 512K x 36	(1) 1M x 36	(1) 4M x 36
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 8M x 36	NONE	NONE	NONE
36MB	(1) 512K x 36	(1) 512K x 36	(1) 4M x 36	(1) 4M x 36
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	NONE

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
36MB	(1) 1M x 36	(1) 8M x 36	NONE	NONE
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
40MB	(1) 1M x 36	(1) 1M x 36	(1) 8M x 36	NONE
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
48MB	(1) 4M x 36	(1) 8M x 36	NONE	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 16M x 36	NONE	NONE	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 8M x 36	NONE
64MB	(1) 8M x 36	(1) 8M x 36	NONE	NONE
65MB	(1) 256K x 36	(1) 16M x 36	NONE	NONE
68MB	(1) 1M x 36	(1) 16M x 36	NONE	NONE
68MB	(1) 1M x 36	(1) 8M x 36	(1) 8M x 36	NONE
72MB	(1) 1M x 36	(1) 1M x 36	(1) 16M x 36	NONE
72MB	(1) 1M x 36	(1) 1M x 36	(1) 8M x 36	(1) 8M x 36
80MB	(1) 4M x 36	(1) 16M x 36	NONE	NONE
80MB	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36	NONE
96MB	(1) 4M x 36	(1) 4M x 36	(1) 16M x 36	NONE
96MB	(1) 4M x 36	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36
96MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	NONE
128MB	(1) 16M x 36	(1) 16M x 36	NONE	NONE
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	NONE	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8
256KB	(4) 64K x 8	NONE	(1) 32K x 8
512KB	(4) 64K x 8	(4) 64K x 8	(1) 32K x 8
512KB	(4) 128K x 8	NONE	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP1	JP2	JP4	JP40	JP41
128KB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
256KB	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3
256KB	1 & 2	2 & 3	1 & 2	1 & 2	1 & 2
512KB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
512KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP8	JP9	JP11	JP12	JP14	JP15
80486SX	2 & 3	Open	Open	3 & 4	2 & 3	4 & 5
CX486DX	1 & 2	Closed	2 & 3	2 & 3	1 & 2, 3 & 4	2 & 3
80486DX	1 & 2	Closed	2 & 3	3 & 4	2 & 3	4 & 5
80486DX2	1 & 2	Closed	2 & 3	3 & 4	2 & 3	4 & 5
Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CON’T)
Type	JP21	JP22	JP24	JP25	JP46
80486SX	2 & 3	1 & 2	Open	Open	2 & 3
CX486DX	1 & 2	2 & 3	2 & 3	2 & 3	1 & 2
80486DX	2 & 3	1 & 2	Open	Open	2 & 3
80486DX2	2 & 3	1 & 2	Open	Open	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JP5	JP6	JP7	JP20
20MHz	Closed	Open	Closed	pins 1 & 2 closed
25MHz	Closed	Closed	Open	pins 1 & 2 closed
33MHz	Open	Closed	Closed	pins 1 & 2 closed
40MHz	Closed	Open	Open	pins 2 & 3 closed
50iMHz	Closed	Closed	Open	pins 1 & 2 closed
66iMHz	Open	Closed	Closed	pins 1 & 2 closed

BUS SPEEDCONFIGURATION
CPU speed	JP29
<=33MHz	pins 1 & 2 closed
>33MHz	pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION
Wait states	JP28
0 wait states	pins 1 & 2 closed
1 wait state	pins 2 & 3 closed