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# PIONEX TECHNOLOGIES, INC.
MB-8500TAC-A (VER. 4)
Processor CX M1/AM K5/Pentium
Processor Speed 66/75/90/100/120/133/150/166/180/200MHz
Chip Set Unidentified
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS AMI
Dimensions 275mm x 220mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, PS/2 mouse
interface, serial ports (2), IR connectors
(2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+-----------+-----------------+-----------|
| Serial port 1 | CN1 | Green PC | J8 pins |
| | | connector | 17 & 18 |
|------------------+-----------+-----------------+-----------|
| Parallel port | CN2 | IDE interface | J8 pins |
| | | LED | 20 & 21 |
|------------------+-----------+-----------------+-----------|
| Serial port 2 | CN3 | VCC ground | J8 pins |
| | | connector | 25 & 26 |
|------------------+-----------+-----------------+-----------|
| Floppy drive | CN4 | PS/2 mouse port | J11 |
| interface | | | |
|------------------+-----------+-----------------+-----------|
| IDE interface 2 | CN5 | IR connector | J12 |
|------------------+-----------+-----------------+-----------|
| IDE interface 1 | CN6 | IR connector | J12A |
|------------------+-----------+-----------------+-----------|
| Speaker | J8 pins 1 | PS/2 mouse | J13 |
| | - 4 | interface | |
|------------------+-----------+-----------------+-----------|
| Power LED & | J8 pins 5 | Chassis fan | JP19 |
| keylock | - 9 | power | |
|------------------+-----------+-----------------+-----------|
| Turbo LED | J8 pins | 32-bit PCI | PC1 - PC3 |
| | 10 & 11 | slots | |
|------------------+-----------+-----------------+-----------|
| Reset switch | J8 pins | | |
| | 12 & 13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | JP2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP4 | Open |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP4 | Closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | BIOS type select EPROM | JP5 | Open |
|---+---------------------------------+-------+--------------|
| | Secondary IDE IRQ select IRQ15 | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Secondary IDE IRQ select IRQ | JP8 | Pins 2 & 3 |
| | through PCI | | closed |
|---+---------------------------------+-------+--------------|
| | Primary IDE IRQ14 enabled | JP9 | Closed |
|---+---------------------------------+-------+--------------|
| | Primary IDE IRQ14 disabled | JP9 | Open |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP12 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP22 | Pins 2 & 3 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP30 | Pins 1 & 2 |
| | alter | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP32 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M 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 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+------------+-----------------|
| 256KB (A) | None | (2) 32K x | None |
| | | 32 | |
|-------------+---------------+------------+-----------------|
| 256KB (B) | (8) 32K x 8 | None | (1) 8K x 8 |
|-------------+---------------+------------+-----------------|
| 512KB (A) | (8) 64K x 8 | None | (1) 16K/32K x 8 |
|-------------+---------------+------------+-----------------|
| 512KB (B) | (8) 64K x 8 | None | (1) 16K x 8 |
|------------------------------------------------------------|
| Note: Board will either have asynchronous or synchronous |
| cache installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 |
|-------------------------------+----------------------------|
| None | Open |
|-------------------------------+----------------------------|
| 256KB (B) (STD/Aster TAG) | Open |
|-------------------------------+----------------------------|
| 512KB (A) (STD TAG) | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| 512KB (B) (Aster TAG) | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier| JP6 | JP7 |JP15| JP16 |JP21 |
| | speed | | | | | | |
|---------+-------+----------+------+------+----+------+-----|
| 120MHz | 50MHz | 2x | Open | Open |Open|Closed|1 & 2|
|---------+-------+----------+------+------+----+------+-----|
| 133MHz | 55MHz | 2x | Open |Closed|Open|Closed|1 & 2|
|---------+-------+----------+------+------+----+------+-----|
| 150MHz | 60MHz | 2x |Closed|Closed|Open|Closed|2 & 3|
|---------+-------+----------+------+------+----+------+-----|
| 166MHz | 66MHz | 2x |Closed| Open |Open|Closed|2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier| JP6 | JP7 |JP15| JP16 |JP21 |
| | speed | | | | | | |
|---------+-------+----------+------+------+----+------+-----|
| 75MHz | 66MHz | 1x |Closed| Open |Open|Closed|2 & 3|
|---------+-------+----------+------+------+----+------+-----|
| 75MHz | 50MHz | 1.5x | Open | Open |Open| Open |1 & 2|
|---------+-------+----------+------+------+----+------+-----|
| 90MHz | 55MHz | 1.5x | Open |Closed|Open| Open |2 & 3|
|---------+-------+----------+------+------+----+------+-----|
| 90MHz | 60MHz | 1.5x |Closed|Closed|Open| Open |2 & 3|
|---------+-------+----------+------+------+----+------+-----|
| 100MHz | 66MHz | 1.5x |Closed| Open |Open| Open |2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| JP6 | JP7 | JP15 | JP16 |JP21 |
| speed | speed | | | | | | |
|-------+-------+----------+------+------+------+------+-----|
| 75MHz | 50MHz | 1.5x | Open | Open | Open | Open |1 & 2|
|-------+-------+----------+------+------+------+------+-----|
| 90MHz | 60MHz | 1.5x |Closed|Closed| Open | Open |2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|100MHz | 66MHz | 1.5x |Closed| Open | Open | Open |2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|120MHz | 60MHz | 2x |Closed|Closed| Open |Closed|2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|133MHz | 66MHz | 2x |Closed| Open | Open |Closed|2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|150MHz | 60MHz | 2.5x |Closed|Closed|Closed|Closed|2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|166MHz | 66MHz | 2.5x |Closed| Open |Closed|Closed|2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|180MHz | 60MHz | 3x |Closed|Closed|Closed| Open |2 & 3|
|-------+-------+----------+------+------+------+------+-----|
|200MHz | 66MHz | 3x |Closed| Open |Closed| Open |2 & 3|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP20 | JP23 | JP24 |
|-------------+--------+---------------+---------------------|
| CX M1 | Open | Pins 1 & 2, 4 | Pins 2 & 3, 4 & 5, |
| | | & 5 closed | 7 & 8, 9 & 10 |
| | | | closed |
|-------------+--------+---------------+---------------------|
| AM K5 | Open | Pins 1 & 2, 4 | Pins 2 & 3, 4 & 5, |
| | | & 5 closed | 7 & 8, 9 & 10 |
| | | | closed |
|-------------+--------+---------------+---------------------|
| P54C/CQS/CT | Open | Pins 1 & 2, 4 | Pins 2 & 3, 4 & 5, |
| | | & 5 closed | 7 & 8, 9 & 10 |
| | | | closed |
|-------------+--------+---------------+---------------------|
| P55C/CT | Closed | Pins 2 & 3, 5 | Pins 1 & 2, 3 & 4, |
| | | & 6 closed | 6 & 7, 8 & 9 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP27 |
|-------------------------------+----------------------------|
| 3.4v | Closed |
|-------------------------------+----------------------------|
| 3.5v | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | JP35 | JP36 |
|--------------------+-------------------+-------------------|
| Used as COM2 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|--------------------+-------------------+-------------------|
| Used as IR | Pins 2 & 3 closed | Pins 2 & 3 closed |
| connector | | |
+------------------------------------------------------------+