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# J-MARK COMPUTER CORPORATION
J-656VXDP
Processor CX 6X86/AM K5/AM K6/Pentium
Processor Speed 75/90/100/120/133/150/166/200/233MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 512MB (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), IR connector, USB connectors (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IR connector | C1 | Serial port 2 | J2 |
|-------------------+----------+------------------+----------|
| IDE interface LED | C2 | Serial port 1 | J3 |
|-------------------+----------+------------------+----------|
| Reset switch | C3 | IDE interface 2 | J4 |
|-------------------+----------+------------------+----------|
| Speaker | C4 | IDE interface 1 | J5 |
|-------------------+----------+------------------+----------|
| Power LED & | C5 | Floppy drive | J6 |
| keylock | | interface | |
|-------------------+----------+------------------+----------|
| Green PC | C6 | Parallel port | J7 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Turbo LED | C7 | USB connector | JP1 |
|-------------------+----------+------------------+----------|
| Turbo switch | C8 | USB connector | JP2 |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J1 | 32-bit PCI slots | PC1 – |
| interface | | | PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| | Flash BIOS voltage select 12v | JP4 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5v | JP4 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| » | CMOS memory normal operation | JP5 | Open |
|---+-------------------------------+-------+----------------|
| | CMOS memory clear | JP5 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM 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 |
|------------------+--------------------+--------------------|
| 128MB | (2) 16M x 36 | None |
|------------------+--------------------+--------------------|
| 136MB | (2) 16M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 144MB | (2) 16M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 160MB | (2) 16M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 192MB | (2) 16M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 (CX 6X86) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| BF0 | BF1 | FS0 | FS1 | FS2 |
| speed | speed | | | | | | |
|-------+--------+----------+-----+-----+------+------+------|
|120MHz | 50MHz | 2x |2 & 3|1 & 2|Closed|Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|133MHz | 55MHz | 2x |2 & 3|1 & 2|Closed|Closed| Open |
|-------+--------+----------+-----+-----+------+------+------|
|150MHz | 60MHz | 2x |2 & 3|1 & 2| Open |Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|166MHz | 66MHz | 2x |2 & 3|1 & 2|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|200MHz | 75MHz | 3x |2 & 3|1 & 2| Open |Closed| Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| BF0 | BF1 | FS0 | FS1 | FS2 |
| speed | speed | | | | | | |
|-------+--------+----------+-----+-----+------+------+------|
| 90MHz | 60MHz | 1.5x |1 & 2|1 & 2| Open |Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|100MHz | 66MHz | 1.5x |1 & 2|1 & 2|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|133MHz | 66MHz | 1.5x |1 & 2|1 & 2|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|166MHz | 66MHz | 2.5x |2 & 3|2 & 3|Closed| Open |Closed|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K6) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier| BF0 | BF1 | FS0 |FS1 | FS2 |
| | speed | | | | | | |
|---------+--------+----------+-----+-----+------+----+------|
| 166MHz | 66MHz | 2.5x |2 & 3|2 & 3|Closed|Open|Closed|
|---------+--------+----------+-----+-----+------+----+------|
| 200MHz | 66MHz | 3x |1 & 2|2 & 3|Closed|Open|Closed|
|---------+--------+----------+-----+-----+------+----+------|
| 233MHz | 66MHz | 3.5x |1 & 2|1 & 2|Closed|Open|Closed|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock |Multiplier| BF0 | BF1 | FS0 | FS1 | FS2 |
| speed | speed | | | | | | |
|-------+--------+----------+-----+-----+------+------+------|
| 75MHz | 50MHz | 1.5x |1 & 2|1 & 2|Closed|Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
| 90MHz | 60MHz | 1.5x |1 & 2|1 & 2| Open |Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|100MHz | 66MHz | 1.5x |1 & 2|1 & 2|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|120MHz | 60MHz | 2x |2 & 3|1 & 2| Open |Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|133MHz | 66MHz | 2x |2 & 3|1 & 2|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|150MHz | 60MHz | 2.5x |2 & 3|2 & 3| Open |Closed|Closed|
|-------+--------+----------+-----+-----+------+------+------|
|166MHz | 66MHz | 2.5x |2 & 3|2 & 3|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|200MHz | 66MHz | 3x |1 & 2|2 & 3|Closed| Open |Closed|
|-------+--------+----------+-----+-----+------+------+------|
|233MHz | 66MHz | 3.5x |1 & 2|1 & 2|Closed| Open |Closed|
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | V core | JP11 | JP12 |
|----------+---------+-------------------+-------------------|
| 3.3v | 2.8v | Pins 1 & 2 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.3v | Pins 2 & 3 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.45v | Pins 4 & 5 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.52v | Pins 5 & 6 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 2.8v | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 3.3v | Pins 2 & 3 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 3.45v | Pins 4 & 5 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 3.52v | Pins 5 & 6 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+