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# ABIT COMPUTER CORPORATION
PN5
Processor CX M1/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Unidentified
Maximum Onboard 128MB
Memory
Cache 256/512KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), cache slot, IR connector, USB connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-------------------+-----------+----------------+-----------|
| Serial port 1 | CN1 | Speaker | J7 pins 7 |
| | | | - 10 |
|-------------------+-----------+----------------+-----------|
| Serial port 2 | CN2 | Reset switch | J7 pins |
| | | | 11 - 12 |
|-------------------+-----------+----------------+-----------|
| Parallel port | CN3 | Green PC | J7 pins |
| | | connector | 14 - 15 |
|-------------------+-----------+----------------+-----------|
| Floppy drive | CN4 | Turbo LED | J7 pins |
| interface | | | 16 & 17 |
|-------------------+-----------+----------------+-----------|
| IDE interface 2 | CN5 | Green PC LED | J8 |
|-------------------+-----------+----------------+-----------|
| IDE interface 1 | CN6 | IR connector | JP2 |
|-------------------+-----------+----------------+-----------|
| PS/2 mouse port | J3 | USB connector | JP28 |
|-------------------+-----------+----------------+-----------|
| IDE interface LED | J6 | 32-bit PCI | PC1 - PC3 |
| | | slots | |
|-------------------+-----------+----------------+-----------|
| Power LED & | J7 pins 1 | Cache slot | SL1 |
| keylock | - 5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+--------+----------|
| » | DRAM refresh rate select 66MHz | DS1 | Closed |
|---+------------------------------------+--------+----------|
| | DRAM refresh rate select 60MHz | DS1 | Open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | JP1 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 256K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 256K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 256K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE SIZE |
|------------------------------------------------------------|
| Size | Bank 0 | SL1 | TAG |
|---------+----------------+-----------------+---------------|
| 256KB | (2) 32K x 32 | Not installed | (1) 32K x 8 |
|---------+----------------+-----------------+---------------|
| 512KB | (2) 32K x 32 | Installed | (1) 32K x 8 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP20 |
|--------------+---------------+--------------+--------------|
| 256KB | Open | Open | Open |
|--------------+---------------+--------------+--------------|
| 512KB | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED (PENTIUM) |
|------------------------------------------------------------|
| Setting | DS2 | DS3 | DS4 | DS5 | DS6 |
|----------+---------+---------+---------+---------+---------|
| 75MHz | Open | Closed | Closed | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 90MHz | Closed | Closed | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 100MHz | Closed | Open | Closed | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 120MHz | Closed | Closed | Open | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| 133MHz | Closed | Open | Closed | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| 150MHz | Closed | Closed | Open | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 166MHz | Closed | Open | Closed | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 180MHz | Closed | Closed | Open | Open | Closed |
|----------+---------+---------+---------+---------+---------|
| 200MHz | Closed | Open | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED (CYRIX) |
|------------------------------------------------------------|
| Setting | DS2 | DS3 | DS4 | DS5 | DS6 |
|----------+----------+----------+---------+---------+-------|
| 120MHz | Open | Closed | Closed | Closed | Open |
|----------+----------+----------+---------+---------+-------|
| 133MHz | Closed | Open | Open | Closed | Open |
|----------+----------+----------+---------+---------+-------|
| 150MHz | Closed | Closed | Open | Closed | Open |
|----------+----------+----------+---------+---------+-------|
| 166MHz | Open | Open | Closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE |
|------------------------------------------------------------|
| Setting | JP23 |
|----------------------------+-------------------------------|
| | 3.3v | Pins 2 & 5 closed |
|--------+-------------------+-------------------------------|
| » | 3.45v | Pins 3 & 6 closed |
|--------+-------------------+-------------------------------|
| | 3.6v | Pins 1 & 4 closed |
|------------------------------------------------------------|
| Note: The location of pin 1 is unidentified. |
+------------------------------------------------------------+