ABIT COMPUTER CORPORATION
AN4
|
Processor |
80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
SIS |
|
Max. Onboard DRAM |
64MB |
|
Cache |
128/256/512KB |
|
BIOS |
AMI/Award |
|
Dimensions |
260mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (3), green PC feature |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Reset switch |
JW3 |
|
Green PC monitor AC connector |
JP8 |
Turbo switch |
JW4 |
|
Power LED & keylock |
JW1 |
Turbo LED |
JW5 |
|
Speaker |
JW2 |
32-bit VESA Local bus slots |
SL1 - SL3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Factory configured - do not alter |
JP9 |
Closed |
|
|
CMOS memory normal operation |
JP10 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP10 |
pins 2 & 3 closed | |
|
|
Green PC enabled |
JP13 |
Closed |
|
Green PC disabled |
JP13 |
Open | |
|
|
Factory configured - do not alter |
JP19 |
Open |
|
|
Factory configured - do not alter |
JP36 |
Closed |
|
Note: The location of the factory configured jumpers is unidentified. | |||
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
|
1MB |
(1) 256K x 36 |
NONE |
NONE |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
|
4MB |
(1) 1M x 36 |
NONE |
NONE |
NONE |
|
6MB |
(1) 256K x 36 |
(1) 256K x 36 |
(4) 1M x 9 |
NONE |
|
6MB |
(4) 1M x 9 |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
|
8MB |
(1) 2M x 36 |
NONE |
NONE |
NONE |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
10MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
10MB |
(1) 1M x 36 |
(1) 1M x 36 |
(4) 256K x 9 |
(4) 256K x 9 |
|
12MB |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 2M x 36 |
(1) 2M x 36 |
NONE |
NONE |
|
16MB |
(1) 4M x 36 |
NONE |
NONE |
NONE |
|
16MB |
(4) 4M x 9 |
NONE |
NONE |
NONE |
|
18MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 4M x 36 |
NONE |
|
20MB |
(1) 1M x 36 |
(1) 4M x 36 |
NONE |
NONE |
|
24MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
NONE |
|
24MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 4M x 36 |
NONE |
|
24MB |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M 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 |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
36MB |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
|
36MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 1M x 36 |
NONE |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
40MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
40MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 2M x 36 |
NONE |
|
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
NONE |
|
48MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
NONE |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
DRAM JUMPER CONFIGURATION | ||||||
|
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
JP39 |
JP40 |
JP41 |
|
SIMM 1 - 4 |
SIMM 5 - 8 |
SIMM 9 (S) |
SIMM 10 (S) |
1 & 2 |
1 & 2 |
Open |
|
SIMM 1 - 4 |
SIMM 5 - 8 |
SIMM 9 (D) |
SIMM 10 (D) |
1 & 2 |
1 & 2 |
Open |
|
SIMM 9 (S) |
SIMM 10 (S) |
SIMM 1 - 4 |
SIMM 5 - 8 |
2 & 3 |
2 & 3 |
Open |
|
SIMM 9 (D) |
SIMM 10 (D) |
SIMM 1 - 4 |
SIMM 5 - 8 |
2 & 3 |
2 & 3 |
Open |
|
SIMM 9 (D) |
SIMM 9 (D) |
SIMM 10 (D) |
SIMM 10 (D) |
2 & 3 |
2 & 3 |
Closed |
|
SIMM 9 (S) |
SIMM 5 - 8 |
SIMM 1 - 4 |
NONE |
2 & 3 |
1 & 2 |
Open |
|
SIMM 1 - 4 |
SIMM 10 (S) |
SIMM 9 (S) |
NONE |
1 & 2 |
Open |
Open |
|
SIMM 1 - 4 |
SIMM 10 (S) |
SIMM 9 (D) |
SIMM 9 (D) |
1 & 2 |
Open |
Open |
|
SIMM 9 (D) |
SIMM 9 (D) |
SIMM 10 (S) |
SIMM 5 - 8 |
Open |
2 & 3 |
Closed |
|
Note: Pins designated should be in the closed position. | ||||||
|
DRAM JUMPER CONFIGURATION (CONT) | ||||||
|
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
JP42 |
JP43 |
JP44 |
|
SIMM 1 - 4 |
SIMM 5 - 8 |
SIMM 9 (S) |
SIMM 10 (S) |
1 & 2 |
1 & 2 |
1 & 2 |
|
SIMM 1 - 4 |
SIMM 5 - 8 |
SIMM 9 (D) |
SIMM 10 (D) |
1 & 2 |
1 & 2 |
1 & 2 |
|
SIMM 9 (S) |
SIMM 10 (S) |
SIMM 1 - 4 |
SIMM 5 - 8 |
2 & 3 |
1 & 2 |
2 & 3 |
|
SIMM 9 (D) |
SIMM 10 (D) |
SIMM 1 - 4 |
SIMM 5 - 8 |
2 & 3 |
2 & 3 |
1 & 2 |
|
SIMM 9 (D) |
SIMM 9 (D) |
SIMM 10 (D) |
SIMM 10 (D) |
2 & 3 |
2 & 3 |
Open |
|
SIMM 9 (S) |
SIMM 5 - 8 |
SIMM 1 - 4 |
NONE |
2 & 3 |
Open |
Open |
|
SIMM 1 - 4 |
SIMM 10 (S) |
SIMM 9 (S) |
NONE |
1 & 2 |
1 & 2 |
2 & 3 |
|
SIMM 1 - 4 |
SIMM 10 (S) |
SIMM 9 (D) |
SIMM 9 (D) |
1 & 2 |
1 & 2 |
2 & 3 |
|
SIMM 9 (D) |
SIMM 9 (D) |
SIMM 10 (S) |
SIMM 5 - 8 |
2 & 3 |
2 & 3 |
Open |
|
Note: Pins designated should be in the closed position. | ||||||
|
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 |
|
512KB |
(4) 128K x 8 |
NONE |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | ||||||
|
Size |
JP1 |
JP2 |
JP3` |
JP20 |
JP21 |
JP38 |
|
128KB |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
2 & 3 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
1 & 2 |
|
512KB |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP15 |
JP16 |
JP18 |
|
80486SX |
pins 2 & 3 closed |
Open |
Open |
|
80487SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
Closed |
|
80486DX/DX2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
Closed |
|
CPU SPEED CONFIGURATION | |||
|
Speed |
JP11 |
JP12 |
JP14 |
|
25MHz |
Open |
Closed |
Closed |
|
33MHz |
Closed |
Closed |
Open |
|
40MHz |
Open |
Open |
Closed |
|
50iMHz |
Open |
Closed |
Closed |
|
50MHz |
Closed |
Open |
Open |
|
66iMHz |
Closed |
Closed |
Open |
|
VESA WAIT STATE CONFIGURATION | |
|
Wait states |
JP4 |
|
0 wait states |
pins 1 & 2 closed |
|
1 wait state |
pins 2 & 3 closed |
|
VESA BUS SPEED CONFIGURATION | |
|
CPU speed |
JP5 |
|
< = 33MHz |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |
|
GREEN PC CONFIGURATION | |
|
Description |
JP8 |
|
Signal |
pin 1 |
|
Ground |
pin 2 |