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# ABIT COMPUTER CORPORATION
PV4/PV4T (REV. 1.1)
Processor 80486SX/SL80486SX/U5S/CX486DX/AM486DX/80486DX/SL80486DX/
AM486DX2/AM486DX2V8T/CX486DX2/CX486DX2V/SL80486DX2/AM486DX4/ 80486DX4/Pentium
Overdrive
Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 128MB
Onboard
DRAM
Cache 128/256/512KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit PCI slots (2), floppy drive interface, game port, green PC connector,
Options IDE interfaces (2), parallel port, serial ports (2), VGA feature connector,
VGA port
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| IDE interface | CN1 | Green PC | JP39 |
| (primary) | | connector | |
|----------------------+----------+---------------+----------|
| IDE interface | CN2 | Power LED & | JW1 |
| (secondary) | | keylock | |
|----------------------+----------+---------------+----------|
| Floppy drive | CN3 | Speaker | JW2 |
| interface | | | |
|----------------------+----------+---------------+----------|
| Parallel port | CN4 | Turbo LED | JW3 |
|----------------------+----------+---------------+----------|
| Serial port 1 | J3 | Turbo switch | JW4 |
|----------------------+----------+---------------+----------|
| Serial port 2 | J4 | Reset switch | JW5 |
|----------------------+----------+---------------+----------|
| Game interface | J5 | IDE interface | JW6 |
| | | LED | |
|----------------------+----------+---------------+----------|
| External battery | J6 | IDE interface | JW7 |
| | | LED | |
|----------------------+----------+---------------+----------|
| VGA interface | J9 | 32-bit PCI | PC1 & |
| | | slots | PC2 |
|----------------------+----------+---------------+----------|
| VGA feature | J10 | | |
| connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J12 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP36 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP42 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP43 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | On board VGA enabled | JP69 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | On board VGA disabled | JP69 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP70 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP84 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | RN18 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | RN19 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | RN20 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | RN21 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (1) 256K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (1) 512K x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 256K x 36 | (1) 256K x 36 | (1) 512K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (1) 1M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (1) 512K x 36 | (1) 512K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (1) 2M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 4M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 18MB | (1) 256K x 36 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 512K x 36 | (1) 512K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (1) 8M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (1) 16M x 36 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (1) 256K x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (1) 1M x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (1) 1M x 36 | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 72MB | (1) 1M x 36 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (1) 4M x 36 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 80MB | (1) 4M x 36 | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (1) 4M x 36 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (1) 8M x 36 | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (1) 16M x 36 | (1) 16M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (4) 64K x 8 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (4) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP20 |
|----------------------------+-------------------------------|
| 128KB | pins 1 & 2, 4 & 5 closed |
|----------------------------+-------------------------------|
| 256KB | pins 2 & 3, 4 & 5 closed |
|----------------------------+-------------------------------|
| 512KB | pins 2 & 3, 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP7 | JP10 | JP11 | JP37 |
|-----------------+----------+--------+------------+---------|
| 80486SX | Open | Open | 1 & 3, 2 & | 1 & 2 |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| SL80486SX | Open | Open | 1 & 3, 2 & | Open |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| U5S | Open | Open | 1 & 3, 2 & | 1 & 2 |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| CX486DX | Open | Open | 1 & 3, 2 & | Open |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| AM486DX | Open | Open | 1 & 3, 2 & | 1 & 2 |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| 80486DX | Open | Open | 1 & 3, 2 & | 1 & 2 |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| SL80486DX | Open | Open | 1 & 3, 2 & | Open |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| AM486DX2 | Open | Open | 1 & 3, 2 & | 1 & 2 |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| AM486DX2V8T | Closed | Open | 3 & 4, 5 & | 1 & 2 |
| | | | 6 | |
|-----------------+----------+--------+------------+---------|
| CX486DX2 | Open | Open | 1 & 3, 2 & | Open |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| CX486DX2V | Open | Open | 3 & 4, 5 & | Open |
| | | | 6 | |
|-----------------+----------+--------+------------+---------|
| SL80486DX2 | Open | Open | 1 & 3, 2 & | Open |
| | | | 4 | |
|-----------------+----------+--------+------------+---------|
| AM486DX4 | Open | Open | 3 & 5, 4 & | 1 & 2 |
| | | | 6 | |
|-----------------+----------+--------+------------+---------|
| 80486DX4 | Open | Open | 3 & 5, 4 & | Open |
| | | | 6 | |
|-----------------+----------+--------+------------+---------|
| Pentium | Open | Open | 1 & 3, 2 & | Open |
| Overdrive | | | 4 | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
| The CX486DX2V, AM486DX4V8T & 80486DX4 are only available |
| on the PV4T mainboard. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | RN1 | RN2 | RN3 | RN4 |
|-----------------+---------+----------+---------+-----------|
| 80486SX | Not | Not | Not |pins 9 - 16|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| SL80486SX | Not | Not | Not |pins 9 - 16|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| U5S | Not | Not | Not |pins 9 - 16|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| CX486DX | Not |pins 1 - 8| Not |pins 1 - 8 |
| |installed| closed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| AM486DX | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| 80486DX | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| SL80486DX | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| AM486DX2 | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| AM486DX2V8T | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| CX486DX2 | Not |pins 1 - 8| Not |pins 1 - 8 |
| |installed| closed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| CX486DX2V | Not |pins 1 - 8| Not |pins 1 - 8 |
| |installed| closed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| SL80486DX2 | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| AM486DX4 | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
| 80486DX4 | Not | Not | Not |pins 5 - 12|
| |installed|installed |installed| closed |
|-----------------+---------+----------+---------+-----------|
|Pentium Overdrive| Not | Not | Not | Not |
| |installed|installed |installed| installed |
|------------------------------------------------------------|
|Note: The CX486DX2V, AM486DX4V8T & 80486DX4 are only |
|available on the PV4T mainboard. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | RN5 | RN6 | RN7 |
|--------------+-------------------+------------+------------|
| 80486SX | Not installed | Not | pins 1 - 8 |
| | | installed | closed |
|--------------+-------------------+------------+------------|
| SL80486SX | Not installed | Not | pins 1 - 8 |
| | | installed | closed |
|--------------+-------------------+------------+------------|
| U5S | Not installed | Not | pins 1 - 8 |
| | | installed | closed |
|--------------+-------------------+------------+------------|
| CX486DX | Not installed | pins 1 - 8 | Not |
| | | closed | installed |
|--------------+-------------------+------------+------------|
| AM486DX | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80486DX | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| SL80486DX | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| AM486DX2 | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| AM486DX2V8T | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| CX486DX2 | Not installed | pins 1 - 8 | Not |
| | | closed | installed |
|--------------+-------------------+------------+------------|
| CX486DX2V | Not installed | pins 1 - 8 | Not |
| | | closed | installed |
|--------------+-------------------+------------+------------|
| SL80486DX2 | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| AM486DX4 | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80486DX4 | Not installed | pins 1 - 8 | pins 1 - 8 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| Pentium | pins 7 & 16 | pins 2 & 3 | pins 1 & 2 |
| Overdrive | closed | closed | closed |
|------------------------------------------------------------|
| Note: The CX486DX2V, AM486DX4V8T & 80486DX4 are only |
| available on the PV4T mainboard. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP32 | JP33 | JP34 | JP35 |
|----------+-------------------+---------+---------+---------|
| 25MHz | pins 1 & 2 closed | Open | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 33MHz | pins 1 & 2 closed | Closed | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 40MHz | pins 1 & 2 closed | Open | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 50iMHz | pins 1 & 2 closed | Open | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 66iMHz | pins 1 & 2 closed | Closed | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 75iMHz | pins 1 & 2 closed | Open | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 80iMHz | pins 1 & 2 closed | Open | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 100iMHz | pins 1 & 2 closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP1 | JP2 | JP3 | JP4 |
|------------+-----------+-----------+-----------+-----------|
| 3.3v | Closed | Open | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 3.45v | Open | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 3.6v | Open | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 4.04v | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CMOS CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP60 | JP80 |
|--------------------+-------------------+-------------------|
| CMOS memory normal | pins 1 & 2 closed | pins 1 & 2 closed |
| operation | | |
|--------------------+-------------------+-------------------|
| CMOS memory clear | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+