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# J-MARK COMPUTER CORPORATION
J-656VXB
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 270mm x 220mm
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), cache slot, IR connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN1 | IDE interface | JC5 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | Power LED & | JC6 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Turbo switch | JC7 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Green PC | JC8 |
| interface | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN5 | IR connector | JP12 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | Chassis fan | JP21 |
| | | power | |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J1 | External battery | JP23 |
| interface | | | |
|-------------------+----------+------------------+----------|
| Speaker | JC2 | 32-bit PCI slots | PC1 – |
| | | | PC3 |
|-------------------+----------+------------------+----------|
| Reset switch | JC3 | Cache slot | SL1 |
|-------------------+----------+------------------+----------|
| Turbo LED | JC4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J4 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP3 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | PCICLK select PCICLK/4 | JP22 | Closed |
|---+---------------------------------+-------+--------------|
| | PCICLK select PCICLK/3 | JP22 | Open |
|---+---------------------------------+-------+--------------|
| | PS/2 IRQ12 enabled | JP29 | Closed |
|---+---------------------------------+-------+--------------|
| | PS/2 IRQ12 disabled | JP29 | Open |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP33 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP33 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM/DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 8MB | (2) 1M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 8MB | None | None | (1) 1M x 64 |
|------------+---------------+---------------+---------------|
| 16MB | (2) 2M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 16MB | None | None | (1) 2M x 64 |
|------------+---------------+---------------+---------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 32MB | (2) 4M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 32MB | None | None | (1) 4M x 64 |
|------------+---------------+---------------+---------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM/DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|-------------+---------------+---------------+--------------|
| 64MB | (2) 8M x 36 | None | None |
|-------------+---------------+---------------+--------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 | None |
|-------------+---------------+---------------+--------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 | None |
|-------------+---------------+---------------+--------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 | None |
|-------------+---------------+---------------+--------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 | None |
|-------------+---------------+---------------+--------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 | None |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | SL1 | TAG |
|-----------+--------------+-------------------+-------------|
| 256KB (A) | (2) 32K x 32 | Not installed | (1) 32K x 8 |
|-----------+--------------+-------------------+-------------|
| 256KB (B) | None | 256KB module | (1) 32K x 8 |
| | | installed | |
|-----------+--------------+-------------------+-------------|
| 512KB (A) | (2) 32K x 32 | 256KB module | (1) 32K x 8 |
| | | installed | |
|-----------+--------------+-------------------+-------------|
| 512KB (B) | None | 512KB module | (1) 32K x 8 |
| | | installed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP7 | JP8 |
|---------------------------+--------+-------+-------+-------|
| 256KB (A) | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|---------------------------+--------+-------+-------+-------|
| 256KB (B) | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|---------------------------+--------+-------+-------+-------|
| 512KB (A, Jet-Way module) | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
|---------------------------+--------+-------+-------+-------|
| 512KB (A, Intel module) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|---------------------------+--------+-------+-------+-------|
| 512KB (B, Jet-Way module) | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
|---------------------------+--------+-------+-------+-------|
| 512KB (B, Intel module) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | J5 | JP13 | JP14 |
| speed | speed | | | | |
|----------+---------+------------+----------+--------+------|
| 120MHz | 50MHz | 2x | 3 & 4, 5 | Closed | Open |
| | | | & 6 | | |
|----------+---------+------------+----------+--------+------|
| 133MHz | 55MHz | 2x | 3 & 4 | Closed | Open |
|----------+---------+------------+----------+--------+------|
| 150MHz | 60MHz | 2x | 5 & 6 | Closed | Open |
|----------+---------+------------+----------+--------+------|
| 166MHz | 66MHz | 2x | Open | Closed | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
| CPU speed | Clock speed | Multiplier | J5 | JP13 | JP14 |
|-----------+-------------+------------+-------+------+------|
| 90MHz | 60MHz | 1.5x | 5 & 6 | Open | Open |
|-----------+-------------+------------+-------+------+------|
| 100MHz | 66MHz | 1.5x | Open | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | J5 | JP13 | JP14 |
| speed | speed | | | | |
|---------+--------+------------+----------+--------+--------|
| 75MHz | 50MHz | 1.5x | 3 & 4, 5 | Open | Open |
| | | | & 6 | | |
|---------+--------+------------+----------+--------+--------|
| 90MHz | 60MHz | 1.5x | 5 & 6 | Open | Open |
|---------+--------+------------+----------+--------+--------|
| 100MHz | 66MHz | 1.5x | Open | Open | Open |
|---------+--------+------------+----------+--------+--------|
| 120MHz | 60MHz | 2x | 5 & 6 | Closed | Open |
|---------+--------+------------+----------+--------+--------|
| 133MHz | 66MHz | 2x | Open | Closed | Open |
|---------+--------+------------+----------+--------+--------|
| 150MHz | 60MHz | 2.5x | 5 & 6 | Closed | Closed |
|---------+--------+------------+----------+--------+--------|
| 166MHz | 66MHz | 2.5x | Open | Closed | Closed |
|---------+--------+------------+----------+--------+--------|
| 200MHz | 66MHz | 3x | Open | Open | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | JP24 | JP25 | JP26 |
|---------------+--------------+--------------+--------------|
| 3.3v | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 3.45v | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 3.52v | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
|Voltage |V core | J11 | J12 | J13 | JP24 | JP25 | JP26 |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 2.5v |Closed | Open | Open |Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 2.8v | Open |Closed | Open | Open |Closed| Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.3v | 3.45v | Open | Open |Closed| Open | Open |Closed|
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 2.5v |Closed | Open | Open |Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 2.8v | Open |Closed | Open | Open |Closed| Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.45v | 3.45v | Open | Open |Closed| Open | Open |Closed|
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 2.5v |Closed | Open | Open |Closed| Open | Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 2.8v | Open |Closed | Open | Open |Closed| Open |
|--------+-------+-------+-------+------+------+------+------|
| 3.52v | 3.45v | Open | Open |Closed| Open | Open |Closed|
+------------------------------------------------------------+
MOS
+------------------------------------------------------------+
| CMOS SELECTION |
|------------------------------------------------------------|
| Setting | JP23 | JP35 |
|-------------------------------+-------------------+--------|
| » | CMOS memory normal | Pins 2 & 3 closed | Open |
| | operation | | |
|---+---------------------------+-------------------+--------|
| | CMOS memory clear | Pins 3 & 4 closed | Closed |
+------------------------------------------------------------+