ABIT COMPUTER CORPORATION
AH4/AH4T (REV. 1.2)
|
Processor |
80486SX/SL80486SX/CX486M7/80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4 |
|
Processor Speed |
20/25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz |
|
Chip Set |
Unidentifed |
|
Max. Onboard DRAM |
128MB |
|
Cache |
128/256/512KB |
|
BIOS |
Award |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (3), green PC connector |
|
NPU Options |
None |
|
CONNECTIONS |
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|
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 |
|
|
» |
CMOS memory normal operation |
JP16 |
pins 1 & 2 closed |
|
|
CMOS memory clear |
JP16 |
pins 2 & 3 closed |
|
» |
Factory configured - do not alter |
JP17 |
N/A |
|
» |
Factory configured - do not alter |
JP19 |
pins 1 & 2 closed |
|
» |
Factory configured - do not alter |
JP23 |
pins 1 & 2 closed |
|
» |
Factory configured - do not alter |
JP26 |
Open |
|
» |
Factory configured - do not alter |
JP30 |
N/A |
|
» |
Factory configured - do not alter |
JP31 |
N/A |
|
» |
Factory configured - do not alter |
JP42 |
Closed |
|
Note: The locations of JP19, JP23 & JP42 are unidentified. |
|||
|
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. |
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|
CPU TYPE CONFIGURATION |
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|
Type |
JP8 |
JP9 |
JP11 |
JP12 |
JP14 |
|
80486SX |
2 & 3 |
Open |
Open |
3 & 4 |
2 & 3 |
|
SL80486SX |
2 & 3 |
Open |
Open |
3 & 4 |
2 & 3 |
|
CX486M7 |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
1 & 2, 3 & 4 |
|
80486DX |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
SL80486DX |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
CX486DX2 |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
1 & 2, 3 & 4 |
|
AM486DX2 |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
80486DX2 |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
SL80486DX2 |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
AM486DX4 |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
80486DX4 |
1 & 2 |
Closed |
2 & 3 |
3 & 4 |
2 & 3 |
|
Note: Pins designated should be in the closed position. SL80486DX/DX2 is only available on the AH4T mainboard |
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|
CPU TYPE CONFIGURATION |
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|
Type |
JP15 |
JP21 |
JP22 |
JP24 |
JP25 |
|
80486SX |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
SL80486SX |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
CX486M7 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
|
80486DX |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
SL80486DX |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
CX486DX2 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
|
AM486DX2 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
80486DX2 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
SL80486DX2 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
AM486DX4 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
80486DX4 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
|
Note: Pins designated should be in the closed position. SL80486DX/DX2 is only available on the AH4T mainboard |
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|
CPU TYPE CONFIGURATION |
||||||
|
Type |
JP32 |
JP46 |
JP48 |
JP49 |
JP50 |
JP62 |
|
80486SX |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
SL80486SX |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
CX486M7 |
1 & 2 |
1 & 2 |
2 & 3 |
Open |
2 & 3 |
Open |
|
80486DX |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
SL80486DX |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
CX486DX2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
1 & 2 |
Open |
|
AM486DX2 |
1 & 2 |
2 & 3 |
1 & 2 |
Open |
1 & 2 |
Open |
|
80486DX2 |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
SL80486DX2 |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
Open |
|
AM486DX4 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
Closed |
|
80486DX4 |
Open |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
Note: Pins designated should be in the closed position. SL80486DX/DX2 is only available on the AH4T mainboard |
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|
CPU SPEED CONFIGURATION |
|||
|
Speed |
JP5 |
JP6 |
JP7 |
|
20MHz |
Closed |
Open |
Closed |
|
25MHz |
Closed |
Closed |
Open |
|
33MHz |
Open |
Closed |
Closed |
|
40MHz |
Closed |
Open |
Open |
|
50iMHz |
Closed |
Closed |
Open |
|
66iMHz |
Open |
Closed |
Closed |
|
75iMHz |
Closed |
Closed |
Open |
|
100iMHz |
Open |
Closed |
Closed |
|
CPU VOLTAGE CONFIGURATION |
||||
|
Voltage |
JP53 |
JP54 |
JP55 |
JP56 |
|
3.3v |
Closed |
Open |
Open |
Open |
|
3.45v |
Open |
Closed |
Open |
Open |
|
3.6v |
Open |
Open |
Closed |
Open |
|
4v |
Open |
Open |
Open |
Closed |
|
BUS SPEED CONFIGURATION |
|
|
CPU speed |
JP29 |
|
<= 33MHz |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |