TEXT View Source
# ABIT COMPUTER CORPORATION
PB4 (REV.1.1)
Processor 80486SX/SL AM486DX/80486DX/CX486DX2/AM486DX2/80486DX2/ CX486DX4/80486DX4/CX
M1/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)/
Speed 120(internal)MHz
Chip Set Unidentified
Max. 64MB
Onboard
DRAM
Cache 128/256KB
BIOS Award
Dimensions 220mm x 220mm
I/O 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE
Options interfaces (2), parallel port, serial ports (2), PISA slot
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| Floppy drive | CN1 | Power LED & | JW1 |
| interface | | keylock | |
|----------------------+----------+---------------+----------|
| Parallel port | CN2 | Speaker | JW2 |
|----------------------+----------+---------------+----------|
| IDE interface 2 | CN3 | Turbo LED | JW3 |
|----------------------+----------+---------------+----------|
| IDE interface 1 | CN4 | Turbo switch | JW4 |
|----------------------+----------+---------------+----------|
| Serial port 2 | J3 | Reset switch | JW5 |
|----------------------+----------+---------------+----------|
| Serial port 1 | J4 | 32-bit PCI | PC1 - |
| | | slots | PC3 |
|----------------------+----------+---------------+----------|
| IDE interface LED | JP16 | PISA slot | SL1 |
|----------------------+----------+---------------+----------|
| External battery | JP18 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP12 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP13 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP17 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP17 | pins 2 & 3 |
| | | | closed |
|------------------------------------------------------------|
| Note: The location of jumpers JP12 and JP14 are |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (1) 512K x 36 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 3MB | (1) 256K x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 3MB | (1) 512K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (1) 512K x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 5MB | (1) 1M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 9MB | (1) 256K x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 9MB | (1) 2M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (1) 512K x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 10MB | (1) 2M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 17MB | (1) 4M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (1) 4M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 33MB | (1) 256K x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 33MB | (1) 8M x 36 | (1) 256K x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 34MB | (1) 512K x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (1) 8M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (1) 8M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 2M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|--------------+--------------------+------------------------|
| 128KB | (4) 32K x 8 | (1) 16K or (1) 32K x 8 |
|--------------+--------------------+------------------------|
| 256KB | (4) 64K x 8 | (1) 16K or (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 |
|----------------------------+-------------------------------|
| 128KB | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 256KB | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP5 | JP8 | JP9 |
|------------+-------------------+--------+------------------|
| 80486SX | Open | Open | Open |
|------------+-------------------+--------+------------------|
| SL AM486DX | pins 2 & 3 closed | Open | pins 1 & 2 |
| | | | closed |
|------------+-------------------+--------+------------------|
| 80486DX | Open | Open | Open |
|------------+-------------------+--------+------------------|
| CX486DX2 | pins 1 & 2 closed | Open | pins 2 & 3 |
| | | | closed |
|------------+-------------------+--------+------------------|
| AM486DX2 | Open | Closed | Open |
|------------+-------------------+--------+------------------|
| 80486DX2 | Open | Open | Open |
|------------+-------------------+--------+------------------|
| CX486DX4 | pins 1 & 2 closed | Open | pins 2 & 3 |
| | | | closed |
|------------+-------------------+--------+------------------|
| AM486DX4 | Open | Open | Open |
|------------+-------------------+--------+------------------|
| 80486DX4 | Open | Open | Open |
|------------+-------------------+--------+------------------|
| CX M1 | pins 2 & 3 closed | Open | pins 1 & 2 |
| | | | closed |
|------------+-------------------+--------+------------------|
| P24D | pins 2 & 3 closed | Open | pins 1 & 2 |
| | | | closed |
|------------+-------------------+--------+------------------|
| P24T | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | RJ1 | RJ2 | RJ3 |
|------------+---------------+---------------+---------------|
| 80486SX | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| SL AM486DX | pins 3 - 10 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| 80486DX | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| CX486DX2 | pins 1 - 8 | Not installed | Installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| AM486DX2 | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| 80486DX2 | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| CX486DX4 | pins 1 - 8 | Not installed | Installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| AM486DX4 | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| 80486DX4 | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| CX M1 | pins 1 - 8 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| P24D | pins 3 - 10 | Installed | Not installed |
| | closed | | |
|------------+---------------+---------------+---------------|
| P24T | pins 7 - 14 | Installed | Not installed |
| | closed | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP4 | JP11 |
|--------------------+-------------------+-------------------|
| 25MHz | Open | Open |
|--------------------+-------------------+-------------------|
| 33MHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 40MHz | Closed | Open |
|--------------------+-------------------+-------------------|
| 50iMHz | Open | Open |
|--------------------+-------------------+-------------------|
| 66iMHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 75iMHz | Open | Open |
|--------------------+-------------------+-------------------|
| 80iMHz | Closed | Open |
|--------------------+-------------------+-------------------|
| 100iMHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 120iMHz | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP1 | JP2 |
|------------------+--------------------+--------------------|
| 3.45v | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 3.6v | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 4v | pins 4 & 5 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 5v | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+