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# J-MARK COMPUTER CORPORATION
J-656VXC
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 256/512KB
BIOS Award
Dimensions 254mm x 218mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse interface, serial
ports (2), USB connectors (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | CN1 | IDE interface 1 | J4 |
|-------------------+----------+------------------+----------|
| Reset switch | CN2 | Serial port 2 | J5 |
|-------------------+----------+------------------+----------|
| Turbo LED | CN3 | IDE interface 2 | J6 |
|-------------------+----------+------------------+----------|
| IDE interface LED | CN4 | Serial port 1 | J7 |
|-------------------+----------+------------------+----------|
| Power LED & | CN5 | Floppy drive | J8 |
| keylock | | interface | |
|-------------------+----------+------------------+----------|
| Turbo switch | CN6 | USB connector | J9 |
|-------------------+----------+------------------+----------|
| Green PC | CN7 | USB connector | J10 |
| connector | | | |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J1 | External battery | JP4 |
| interface | | | |
|-------------------+----------+------------------+----------|
| Parallel port | J3 | 32-bit PCI slots | PC1 – |
| | | | PC4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | JP2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP9 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | JP13 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | JP13 | Open |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP14 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP14 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (2) 32K x 32 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (2) 64K x 32 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier| JP6 | JP7 |JP8 | JP18 |JP19|
| | speed | | | | | | |
|---------+--------+----------+------+------+----+------+----|
| 120MHz | 50MHz | 2x |Closed|Closed|Open|Closed|Open|
|---------+--------+----------+------+------+----+------+----|
| 133MHz | 55MHz | 2x | Open | Open |Open|Closed|Open|
|---------+--------+----------+------+------+----+------+----|
| 150MHz | 60MHz | 2x | Open |Closed|Open|Closed|Open|
|---------+--------+----------+------+------+----+------+----|
| 166MHz | 66MHz | 2x |Closed| Open |Open|Closed|Open|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier| JP6 | JP7 |JP8 |JP18|JP19|
| | speed | | | | | | |
|---------+----------+----------+------+------+----+----+----|
| 90MHz | 60MHz | 1.5x | Open |Closed|Open|Open|Open|
|---------+----------+----------+------+------+----+----+----|
| 100MHz | 66MHz | 1.5x |Closed| Open |Open|Open|Open|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| JP6 | JP7 |JP8 | JP18 | JP19 |
| speed | speed | | | | | | |
|-------+--------+----------+------+------+----+------+------|
| 75MHz | 50MHz | 1.5x |Closed|Closed|Open| Open | Open |
|-------+--------+----------+------+------+----+------+------|
| 90MHz | 60MHz | 1.5x | Open |Closed|Open| Open | Open |
|-------+--------+----------+------+------+----+------+------|
|100MHz | 66MHz | 1.5x |Closed| Open |Open| Open | Open |
|-------+--------+----------+------+------+----+------+------|
|120MHz | 60MHz | 2x | Open |Closed|Open|Closed| Open |
|-------+--------+----------+------+------+----+------+------|
|133MHz | 66MHz | 2x |Closed| Open |Open|Closed| Open |
|-------+--------+----------+------+------+----+------+------|
|150MHz | 60MHz | 2.5x | Open |Closed|Open|Closed|Closed|
|-------+--------+----------+------+------+----+------+------|
|166MHz | 66MHz | 2.5x |Closed| Open |Open|Closed|Closed|
|-------+--------+----------+------+------+----+------+------|
|200MHz | 66MHz | 3x |Closed| Open |Open| Open |Closed|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP3 |
|--------------------------+---------------------------------|
| P54C | Pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| P55C | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | JP15 | JP16 | JP17 |
|---------------+--------------+--------------+--------------|
| 3.3v | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 3.45v | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 3.52v | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
|Voltage |V core | JP10 | JP11 | JP12 | JP15 | JP16 | JP17 |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 2.5v |Closed | Open | Open |Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 2.8v | Open |Closed | Open |Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 3.45v | Open | Open |Closed|Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 2.5v |Closed | Open | Open | Open | Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 2.8v | Open |Closed | Open | Open |Closed| Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 3.45v | Open | Open |Closed| Open |Closed| Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 2.5v |Closed | Open | Open | Open | Open |Closed|
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 2.8v | Open |Closed | Open | Open |Closed|Closed|
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 3.45v | Open | Open |Closed| Open | Open |Closed|
+------------------------------------------------------------+
MOS
+------------------------------------------------------------+
| CMOS SELECTION |
|------------------------------------------------------------|
| Setting | JP4 | JP5 |
|-------------------------------+-------------------+--------|
| » | CMOS memory normal | Pins 2 & 3 closed | Open |
| | operation | | |
|---+---------------------------+-------------------+--------|
| | CMOS memory clear | Pins 3 & 4 closed | Closed |
+------------------------------------------------------------+