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# J-MARK COMPUTER CORPORATION
J-656B
Processor Pentium
Processor Speed 75/90/100/120/133/150/180/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 330mm x 218mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
IDE interfaces (2), parallel port, PS/2 mouse
interface, serial ports (2), VRM connector.
IR connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN1 | Speaker | J4 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN2 | Power LED & | J5 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Turbo LED | J6 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Turbo switch | J7 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN5 | IR connector | JP8 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | PS/2 mouse | MS1 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Reset switch | J2 | 32-bit PCI slots | PC1 – |
| | | | PC4 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J3 | VRM connector | VRM |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J8 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | J9 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | PCI CLK select CLK/4 | JP3 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | PCI CLK select CLK/3 | JP3 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | I/O address select 250 HEX | JP4 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | I/O address select 3F0 HEX | JP4 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | IDE interface 1 IRQ select | JP5 | Pins 1 & 2 |
| | IRQ14 | | closed |
|---+---------------------------------+-------+--------------|
| | IDE interface 1 IRQ select | JP5 | Pins 2 & 3 |
| | MIRQ1 | | closed |
|---+---------------------------------+-------+--------------|
| » | IDE interface 2 IRQ select | JP6 | Pins 1 & 2 |
| | IRQ15 | | closed |
|---+---------------------------------+-------+--------------|
| | IDE interface 2 IRQ select | JP6 | Pins 2 & 3 |
| | MIRQ0 | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP9 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Green PC disabled | JP10 | Open |
|---+---------------------------------+-------+--------------|
| | Green PC enabled | JP10 | Closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP15 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP16 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP17 | Open |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP17 | Closed |
|---+---------------------------------+-------+--------------|
| » | CPU type select write back | JP18 | Open |
|---+---------------------------------+-------+--------------|
| | CPU type select write through | JP18 | Closed |
|---+---------------------------------+-------+--------------|
| » | CPU pipeline enabled | JP19 | Closed |
|---+---------------------------------+-------+--------------|
| | CPU pipeline disabled | JP19 | Open |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP20 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP24 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | 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) 2M x 36 | (2) 1M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+-----------------------+--------------------|
| 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 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. Board also accepts x 32 |
| SIMMs. Banks are interchangeable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+-------------+-----------------|
| 256KB (A) | (2) 32K x 32 | None | (1) 8K x 8 |
|------------+---------------+-------------+-----------------|
| 256KB (B) | None | (8) 32K x 8 | (1) 8K x 8 |
|------------+---------------+-------------+-----------------|
| 512KB (A) | (2) 64K x 32 | None | (1) 16K/32K x 8 |
|------------+---------------+-------------+-----------------|
| 512KB (B) | None | (8) 64K x 8 | (1) 16K/32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP14 |
|----------------------------+-------------------------------|
| 256KB (A) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 256KB (B) | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 512KB (A) | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 512KB (B) | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP1 | JP2 |
|------------------+----------------------+------------------|
| 3v synchronous | Open | Pins 1 & 2, 3 & |
| | | 4, 5 & 6 closed |
|------------------+----------------------+------------------|
| 3v asynchronous | Open | Pins 1 & 2, 3 & |
| | | 4, 5 & 6 closed |
|------------------+----------------------+------------------|
| 5v mixed | Pins 1 & 2, 3 & 4, 5 | Open |
| asynchronous | & 6 closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier| JP11 | JP12 | JP26 | JP27 |
|---------+-----------+----------+------+------+------+------|
| 75MHz | 50MHz | 1.5x | Open | Open | Open | Open |
|---------+-----------+----------+------+------+------+------|
| 90MHz | 60MHz | 1.5x | Open |Closed| Open | Open |
|---------+-----------+----------+------+------+------+------|
| 100MHz | 66MHz | 1.5x |Closed|Closed| Open | Open |
|---------+-----------+----------+------+------+------+------|
| 120MHz | 60MHz | 2x | Open |Closed| Open |Closed|
|---------+-----------+----------+------+------+------+------|
| 133MHz | 66MHz | 2x |Closed|Closed| Open |Closed|
|---------+-----------+----------+------+------+------+------|
| 150MHz | 60MHz | 2.5x | Open |Closed|Closed|Closed|
|---------+-----------+----------+------+------+------+------|
| 180MHz | 60MHz | 3x | Open |Closed|Closed| Open |
|---------+-----------+----------+------+------+------+------|
| 200MHz | 66MHz | 3x |Closed|Closed|Closed| Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP28 | JP29 | JP30 |
|---------------+--------------+--------------+--------------|
| 3.3v | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 3.45v | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 3.6v | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS SELECTION |
|------------------------------------------------------------|
| Setting | JP21 | JP31 |
|------------------+--------------------+--------------------|
| | EPROM | Pins 1 & 2 closed | Pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| » | 12v flash | Pins 2 & 3 closed | Pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | 5v flash | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+