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# VEXTREC TECHNOLOGY, INC.
GMB-P56IAX (VER. 1.02)
Device Type Mainboard
Processor CX 6X86/AM K5/Pentium/Pentium MMX
Processor Speed 75/90/100/120/133/150/166/200MHz
Chip Set Intel 430VX
Maximum Onboard 128MB (EDO & SDRAM supported)
Memory
Cache 256/512KB
BIOS AMI/Award
I/O Options 32-bit PCI slots (4), floppy drive interface,
IDE interface (2), parallel port, PS/2 mouse
port, serial ports (2), cache slot, IR
connector, USB connector (2)
Dimensions 305mm x 210mm
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| ATX power supply | ATX | IR connector | J10 |
|-------------------+----------+------------------+----------|
| Reset switch | J1 | USB connector 1 | J11 |
|-------------------+----------+------------------+----------|
| Green PC | J2 | USB connector 2 | J12 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Suspend LED | J3 | Serial port 2 | J14 |
|-------------------+----------+------------------+----------|
| Speaker | J4 | Parallel port | J15 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J5 | PS/2 mouse port | J16 |
|-------------------+----------+------------------+----------|
| Power LED & | J6 | Serial port 1 | J18 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | J7 | Power switch | JP4 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | J8 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| Floppy drive | J9 | Cache slot | SL1 |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| ยป | CMOS memory normal operation | JP1 | Open |
|---+-------------------------------+-------+----------------|
| | CMOS memory clear | JP1 | Closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 12v | JP2 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5v | JP2 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|---------+----------------+----------------+----------------|
| 4MB | (2) 512KB x 32 | None | None |
|---------+----------------+----------------+----------------|
| 8MB | (2) 512KB x 32 | (2) 512KB x 32 | None |
|---------+----------------+----------------+----------------|
| 8MB | (2) 1MB x 32 | None | None |
|---------+----------------+----------------+----------------|
| 16MB | (2) 1MB x 32 | (2) 1MB x 32 | None |
|---------+----------------+----------------+----------------|
| 16MB | (2) 2MB x 32 | None | None |
|---------+----------------+----------------+----------------|
| 24MB | (2) 1MB x 32 | (2) 1MB x 32 | (1) 1MB x 64 |
|---------+----------------+----------------+----------------|
| 24MB | (2) 2MB x 32 | (2) 1MB x 32 | None |
|---------+----------------+----------------+----------------|
| 32MB | (2) 2MB x 32 | (2) 2MB x 32 | None |
|---------+----------------+----------------+----------------|
| 32MB | (2) 4MB x 32 | None | None |
|---------+----------------+----------------+----------------|
| 40MB | (2) 2MB x 32 | (2) 2MB x 32 | (1) 1MB x 64 |
|---------+----------------+----------------+----------------|
| 40MB | (2) 4MB x 32 | (2) 1MB x 32 | None |
|---------+----------------+----------------+----------------|
| 48MB | (2) 2MB x 32 | (2) 2MB x 32 | (1) 2MB x 64 |
|---------+----------------+----------------+----------------|
| 48MB | (2) 4MB x 32 | (2) 2MB x 32 | None |
|---------+----------------+----------------+----------------|
| 64MB | (2) 4MB x 32 | (2) 4MB x 32 | None |
|---------+----------------+----------------+----------------|
| 64MB | (2) 8MB x 32 | None | None |
|---------+----------------+----------------+----------------|
| 72MB | (2) 4MB x 32 | (2) 4MB x 32 | (1) 1MB x 64 |
|---------+----------------+----------------+----------------|
| 72MB | (2) 8MB x 32 | (2) 1MB x 32 | None |
|---------+----------------+----------------+----------------|
| 80MB | (2) 4MB x 32 | (2) 4MB x 32 | (1) 2MB x 64 |
|---------+----------------+----------------+----------------|
| 80MB | (2) 8MB x 32 | (2) 2MB x 32 | None |
|---------+----------------+----------------+----------------|
| 96MB | (2) 4MB x 32 | (2) 4MB x 32 | (1) 4MB x 64 |
|---------+----------------+----------------+----------------|
| 96MB | (2) 8MB x 32 | (2) 4MB x 32 | None |
|---------+----------------+----------------+----------------|
| 128MB | (2) 8MB x 32 | (2) 8MB x 32 | None |
|------------------------------------------------------------|
| Note: Board accepts EDO and SDRAM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Voltage | S7 | S8 |
|------------+-----------------------+-----------------------|
| 3.3v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------+-----------------------+-----------------------|
| 5v | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| 256KB onboard, upgradeable to 512KB by inserting a cache |
| module in SL1. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86) |
|------------------------------------------------------------|
|Speed | Clock |Multiplier|JP11 |JP12 | S1 | S2 | S3 |
| | speed | | | | | | |
|------+---------+----------+-----+-----+------+------+------|
|120MHz| 50MHz | 2x |2 & 3|1 & 2|Closed|Closed| Open |
|------+---------+----------+-----+-----+------+------+------|
|133MHz| 55MHz | 2x |2 & 3|1 & 2| Open |Closed| Open |
|------+---------+----------+-----+-----+------+------+------|
|150MHz| 60MHz | 2x |2 & 3|1 & 2|Closed| Open | Open |
|------+---------+----------+-----+-----+------+------+------|
|166MHz| 66MHz | 2x |2 & 3|1 & 2| Open | Open | Open |
|------+---------+----------+-----+-----+------+------+------|
|200MHz| 66MHz | 2.5x |2 & 3|1 & 2| Open | Open |Closed|
|------------------------------------------------------------|
|Note: Numbers designate pins that should be closed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
|Speed |Clock speed|Multiplier|JP11 |JP12 | S1 | S2 | S3 |
|------+-----------+----------+-----+-----+------+------+----|
|75MHz | 50MHz | 1.5x |1 & 2|1 & 2|Closed|Closed|Open|
|------+-----------+----------+-----+-----+------+------+----|
|90MHz | 60MHz | 1.5x |1 & 2|1 & 2|Closed| Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|100MHz| 66MHz | 1.5x |1 & 2|1 & 2| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|120MHz| 60MHz | 2x |1 & 2|1 & 2|Closed| Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|133MHz| 66MHz | 2x |1 & 2|1 & 2| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|150MHz| 60MHz | 2.5x |1 & 2|1 & 2| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|166MHz| 66MHz | 2.5x |2 & 3|2 & 3| Open | Open |Open|
|------------------------------------------------------------|
|Note: Numbers designate pins that should be closed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (PENTIUM) |
|------------------------------------------------------------|
|Speed |Clock speed|Multiplier|JP11 |JP12 | S1 | S2 | S3 |
|------+-----------+----------+-----+-----+------+------+----|
|75MHz | 50MHz | 1.5x |1 & 2|1 & 2|Closed|Closed|Open|
|------+-----------+----------+-----+-----+------+------+----|
|90MHz | 60MHz | 1.5x |1 & 2|1 & 2|Closed| Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|100MHz| 66MHz | 1.5x |1 & 2|1 & 2| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|120MHz| 60MHz | 2x |2 & 3|1 & 2|Closed| Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|133MHz| 66MHz | 2x |2 & 3|1 & 2| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|150MHz| 60MHz | 2.5x |2 & 3|2 & 3|Closed| Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|166MHz| 66MHz | 2.5x |2 & 3|2 & 3| Open | Open |Open|
|------+-----------+----------+-----+-----+------+------+----|
|200MHz| 66MHz | 3x |1 & 2|2 & 3| Open | Open |Open|
|------------------------------------------------------------|
|Note: Numbers designate pins that should be closed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (PENTIUM MMX) |
|------------------------------------------------------------|
| Speed |Clock speed|Multiplier| JP11 |JP12 | S1 | S2 | S3 |
|-------+-----------+----------+------+-----+------+----+----|
|150MHz | 60MHz | 2.5x |2 & 3 |2 & 3|Closed|Open|Open|
|-------+-----------+----------+------+-----+------+----+----|
|166MHz | 66MHz | 2.5x |2 & 3 |2 & 3| Open |Open|Open|
|-------+-----------+----------+------+-----+------+----+----|
|200MHz | 66MHz | 3x |1 & 2 |2 & 3| Open |Open|Open|
|------------------------------------------------------------|
|Note: Numbers designate pins that should be closed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | JP8 | S4 | S5 | S6 |
|------------+-----------+-----------+-----------+-----------|
| 3.4v | Closed | Closed | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 3.5v | Open | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
| Voltage (core) | JP8 | S4 | S5 | S6 |
|----------------+------------+----------+---------+---------|
| 2.8v | Closed | Open | Open | Open |
+------------------------------------------------------------+