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# ABIT COMPUTER CORPORATION
PR5 R2 PCI (REV (2.01)
Processor CX M1/AM K5/Pentium
Processor Speed 75/90/100/120/133/150/166/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), IR connector, USB connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+-------------+--------------+---------------|
| Serial port 1 | CN1 | Green PC | J5 pins 7 - 9 |
| | | connector | |
|---------------+-------------+--------------+---------------|
| Serial port 2 | CN2 | Speaker | J5 pins |
| | | | 14/16/18/20 |
|---------------+-------------+--------------+---------------|
| Floppy drive | CN3 | Reset switch | J5 pins 17 - |
| interface | | | 19 |
|---------------+-------------+--------------+---------------|
| Parallel port | CN4 | PS/2 mouse | JP3 |
| | | port | |
|---------------+-------------+--------------+---------------|
| IDE interface | CN5 | USB | JP6 |
| 2 | | connector | |
|---------------+-------------+--------------+---------------|
| IDE interface | CN6 | Chassis fan | JP9 |
| 1 | | power | |
|---------------+-------------+--------------+---------------|
| IDE interface | J4 | IR connector | JP14 |
| LED | | | |
|---------------+-------------+--------------+---------------|
| Power LED & | J5 pins | 32-bit PCI | PC1 - PC3 |
| keylock | 2/4/6/8/10 | slots | |
|---------------+-------------+--------------+---------------|
| Turbo LED | J5 pins 3 - | | |
| | 5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| » | CMOS memory normal operation | JP1 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | CMOS memory clear | JP1 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| » | Flash BIOS voltage select 12v | JP4 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5v | JP4 | Pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 32 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 32 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 32 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 32 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 32 | (2) 4M x 32 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 32 | (2) 1M x 32 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 32 | (2) 2M x 32 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 32 | (2) 4M x 32 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 32 | (2) 8M x 32 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (2) 32K x 32 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|DS/1|DS/2|DS/3|DS/4|DS/5|DS/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 120MHz | 50MHz | 2x |Off | On | On | On |Off |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 55MHz | 2x |Off | On |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2x |Off | On |Off | On | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2x |Off | On | On |Off | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
| CPU | CPU | Clock | Multiplier | DS/1 | DS/2 | DS/3 |
| speed | type | speed | | | | |
|--------+--------+--------+------------+------+------+------|
| 75MHz | SSA/5 | 50MHz | 1.5x | Off | Off | On |
|--------+--------+--------+------------+------+------+------|
| 75MHz | SSA/5 | 66MHz | 1x | Off | On | On |
|--------+--------+--------+------------+------+------+------|
| 90MHz | SSA/5 | 55MHz | 1.5x | Off | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 90MHz | SSA/5 | 60MHz | 1.5x | Off | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 100MHz | SSA/5 | 66MHz | 1.5x | Off | Off | On |
|--------+--------+--------+------------+------+------+------|
| 100MHz | K5 | 55MHz | 1.5x | Off | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 100MHz | K5 | 50MHz | 1.5x | Off | Off | On |
|--------+--------+--------+------------+------+------+------|
| 120MHz | K5 | 60MHz | 1.5x | Off | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 133MHz | K5 | 66MHz | 1.5x | Off | Off | On |
|--------+--------+--------+------------+------+------+------|
| 150MHz | K5 | 60MHz | 2x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 166MHz | K5 | 66MHz | 2x | Off | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD, CON’T) |
|------------------------------------------------------------|
| CPU | CPU | Clock | Multiplier | DS/4 | DS/5 | DS/6 |
| speed | type | speed | | | | |
|--------+--------+--------+------------+------+------+------|
| 75MHz | SSA/5 | 50MHz | 1.5x | On | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 75MHz | SSA/5 | 66MHz | 1x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 90MHz | SSA/5 | 55MHz | 1.5x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 90MHz | SSA/5 | 60MHz | 1.5x | On | On | Off |
|--------+--------+--------+------------+------+------+------|
| 100MHz | SSA/5 | 66MHz | 1.5x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 100MHz | K5 | 55MHz | 1.5x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 100MHz | K5 | 50MHz | 1.5x | On | Off | Off |
|--------+--------+--------+------------+------+------+------|
| 120MHz | K5 | 60MHz | 1.5x | On | On | Off |
|--------+--------+--------+------------+------+------+------|
| 133MHz | K5 | 66MHz | 1.5x | Off | On | Off |
|--------+--------+--------+------------+------+------+------|
| 150MHz | K5 | 60MHz | 2x | On | On | Off |
|--------+--------+--------+------------+------+------+------|
| 166MHz | K5 | 66MHz | 2x | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|DS/1|DS/2|DS/3|DS/4|DS/5|DS/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 75MHz | 50MHz | 1.5x |Off |Off | On | On |Off |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 90MHz | 60MHz | 1.5x |Off |Off |Off | On | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 100MHz | 66MHz | 1.5x |Off |Off | On |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 120MHz | 60MHz | 2x |Off | On |Off | On | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 66MHz | 2x |Off | On | On |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2.5x | On | On |Off | On | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On | On |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x | On |Off | On |Off | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP11 | JP12 |
|--------------------+-------------------+-------------------|
| » | 3.38v (STD/VR) | Pins 3 & 4 closed | Pins 1 & 2 closed |
|---+----------------+-------------------+-------------------|
| | 3.52v (VRE) | Pins 5 & 6 closed | Pins 3 & 4 closed |
+------------------------------------------------------------+