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# ABIT COMPUTER CORPORATION
AN4
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. Onboard 64MB
DRAM
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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | J1 | Reset switch | JW3 |
|--------------------+----------+-----------------+----------|
| Green PC monitor | JP8 | Turbo switch | JW4 |
| AC connector | | | |
|--------------------+----------+-----------------+----------|
| Power LED & | JW1 | Turbo LED | JW5 |
| keylock | | | |
|--------------------+----------+-----------------+----------|
| Speaker | JW2 | 32-bit VESA | SL1 - |
| | | Local bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+---------+------------|
| » | Factory configured - do not | JP9 | Closed |
| | alter | | |
|---+---------------------------------+---------+------------|
| » | 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 | JP19 | Open |
| | alter | | |
|---+---------------------------------+---------+------------|
| » | Factory configured - do not | JP36 | Closed |
| | alter | | |
|------------------------------------------------------------|
| 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 | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 256K x | (1) 256K x | (4) 1M x 9 | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 1M x 9 | (1) 256K x | (1) 256K x | NONE |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (1) 1M x | (1) 1M x |
| | 9 | 9 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | (4) 256K x | (4) 256K x |
| | | | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (1) 1M x | (1) 1M x |
| | | | 36 | 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 | (4) 256K x | (1) 4M x | NONE |
| | 9 | 9 | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 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 | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 4M x 9 | (4) 4M x 9 | (1) 1M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 4M x 9 | (4) 4M x 9 | (1) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Bank 0 | Bank 1 | Bank 2 | Bank 3 | JP39 | JP40 | JP41 |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 1 | SIMM 5 | SIMM 9 | SIMM | 1 & 2 | 1 & 2 | Open |
| - 4 | - 8 | (S) | 10 (S) | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 1 | SIMM 5 | SIMM 9 | SIMM | 1 & 2 | 1 & 2 | Open |
| - 4 | - 8 | (D) | 10 (D) | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 9 | SIMM | SIMM 1 | SIMM 5 | 2 & 3 | 2 & 3 | Open |
| (S) | 10 (S) | - 4 | - 8 | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 9 | SIMM | SIMM 1 | SIMM 5 | 2 & 3 | 2 & 3 | Open |
| (D) | 10 (D) | - 4 | - 8 | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 9 | SIMM 9 | SIMM | SIMM | 2 & 3 | 2 & 3 | Closed |
| (D) | (D) | 10 (D) | 10 (D) | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 9 | SIMM 5 | SIMM 1 | NONE | 2 & 3 | 1 & 2 | Open |
| (S) | - 8 | - 4 | | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 1 | SIMM | SIMM 9 | NONE | 1 & 2 | Open | Open |
| - 4 | 10 (S) | (S) | | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 1 | SIMM | SIMM 9 | SIMM 9 | 1 & 2 | Open | Open |
| - 4 | 10 (S) | (D) | (D) | | | |
|--------+--------+--------+--------+-------+-------+--------|
| SIMM 9 | SIMM 9 | SIMM | SIMM 5 | Open | 2 & 3 | Closed |
| (D) | (D) | 10 (S) | - 8 | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Bank 0 | Bank 1 | Bank 2 | Bank 3 | JP42 | JP43 | JP44 |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 1 | SIMM 5 | SIMM 9 | SIMM | 1 & 2 | 1 & 2 | 1 & 2 |
| - 4 | - 8 | (S) | 10 (S) | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 1 | SIMM 5 | SIMM 9 | SIMM | 1 & 2 | 1 & 2 | 1 & 2 |
| - 4 | - 8 | (D) | 10 (D) | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 9 | SIMM | SIMM 1 | SIMM 5 | 2 & 3 | 1 & 2 | 2 & 3 |
| (S) | 10 (S) | - 4 | - 8 | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 9 | SIMM | SIMM 1 | SIMM 5 | 2 & 3 | 2 & 3 | 1 & 2 |
| (D) | 10 (D) | - 4 | - 8 | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 9 | SIMM 9 | SIMM | SIMM | 2 & 3 | 2 & 3 | Open |
| (D) | (D) | 10 (D) | 10 (D) | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 9 | SIMM 5 | SIMM 1 | NONE | 2 & 3 | Open | Open |
| (S) | - 8 | - 4 | | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 1 | SIMM | SIMM 9 | NONE | 1 & 2 | 1 & 2 | 2 & 3 |
| - 4 | 10 (S) | (S) | | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 1 | SIMM | SIMM 9 | SIMM 9 | 1 & 2 | 1 & 2 | 2 & 3 |
| - 4 | 10 (S) | (D) | (D) | | | |
|---------+--------+--------+--------+-------+-------+-------|
| SIMM 9 | SIMM 9 | SIMM | SIMM 5 | 2 & 3 | 2 & 3 | Open |
| (D) | (D) | 10 (S) | - 8 | | | |
|------------------------------------------------------------|
| 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 | Open | Open |
| | closed | | |
|-------------+------------------+------------------+--------|
| 80487SX | pins 1 & 2 | pins 2 & 3 | Closed |
| | closed | closed | |
|-------------+------------------+------------------+--------|
| 80486DX/DX2 | pins 1 & 2 | pins 1 & 2 | Closed |
| | 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 |
+------------------------------------------------------------+