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# J-MARK COMPUTER CORPORATION
J-656HXA
Processor Pentium
Processor Speed 75/90/100/120/133/150/166/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 384MB
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 280mm 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 | Reset switch | J5 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | IDE interface | J6 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Floppy drive | CN3 | Power LED & | J7 |
| interface | | keylock | |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Turbo LED | J8 |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN5 | Green PC | JP16 |
| | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | Chassis fan | JP36 |
| | | power | |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J2 | IR connector | JP37 |
| interface | | | |
|-------------------+----------+------------------+----------|
| Speaker | J4 | 32-bit PCI slots | PC1 – |
| | | | PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | CMOS memory normal operation | J12 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J12 | Pins 3 & 4 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | JP2 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | JP2 | Open |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 enabled | JPS1 | Closed |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 disabled | JPS1 | Open |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP17 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP17 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP26 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP30 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 8MB | (2) 1M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 16MB | (2) 2M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 | None |
|------------+---------------+---------------+---------------|
| 32MB | (2) 4M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 32MB | (2) 1M x 36 | (2) 1M x 36 | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 | None |
|------------+---------------+---------------+---------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 48MB | (2) 1M x 36 | (2) 1M x 36 | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (2) 8M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 64MB | (2) 2M x 36 | (2) 2M x 36 | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 | None |
|------------+---------------+---------------+---------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 72MB | (2) 4M x 36 | (2) 4M x 36 | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (2) 1M x 36 | (2) 1M x 36 | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 80MB | (2) 4M x 36 | (2) 4M x 36 | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (2) 2M x 36 | (2) 2M x 36 | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (2) 4M x 36 | (2) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 96MB | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (2) 16M x 36 | None | None |
|------------+---------------+---------------+---------------|
| 128MB | (2) 4M x 36 | (2) 4M x 36 | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 | None |
|------------+---------------+---------------+---------------|
| 136MB | (2) 1M x 36 | (2) 16M x 36 | None |
|------------+---------------+---------------+---------------|
| 136MB | (2) 8M x 36 | (2) 8M x 36 | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 144MB | (2) 1M x 36 | (2) 1M x 36 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 144MB | (2) 2M x 36 | (2) 16M x 36 | None |
|------------+---------------+---------------+---------------|
| 144MB | (2) 8M x 36 | (2) 8M x 36 | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 160MB | (2) 2M x 36 | (2) 2M x 36 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 160MB | (2) 4M x 36 | (2) 16M x 36 | None |
|------------+---------------+---------------+---------------|
| 160MB | (2) 8M x 36 | (2) 8M x 36 | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 192MB | (2) 4M x 36 | (2) 4M x 36 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 192MB | (2) 8M x 36 | (2) 16M x 36 | None |
|------------+---------------+---------------+---------------|
| 192MB | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 256MB | (2) 8M x 36 | (2) 8M x 36 | (2) 16M x 36 |
|------------+---------------+---------------+---------------|
| 264MB | (2) 16M x 36 | (2) 16M x 36 | (2) 1M x 36 |
|------------+---------------+---------------+---------------|
| 272MB | (2) 16M x 36 | (2) 16M x 36 | (2) 2M x 36 |
|------------+---------------+---------------+---------------|
| 288MB | (2) 16M x 36 | (2) 16M x 36 | (2) 4M x 36 |
|------------+---------------+---------------+---------------|
| 320MB | (2) 16M x 36 | (2) 16M x 36 | (2) 8M x 36 |
|------------+---------------+---------------+---------------|
| 384MB | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 |
|------------------------------------------------------------|
| 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) | (2) 64K x 32 | Not installed | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP19 | JP20 | JP35 |
|-----------+----------------+---------------+---------------|
| 256KB (A) | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (B) | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 512KB (A) | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 512KB (B) | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP22 | JP23 | JP41 |
| speed | speed | | | | |
|---------+--------+------------+--------+--------+----------|
| 75MHz | 50MHz | 1.5x | Open | Open | 1 & 2, 3 |
| | | | | | & 4 |
|---------+--------+------------+--------+--------+----------|
| 90MHz | 60MHz | 1.5x | Open | Open | 1 & 2 |
|---------+--------+------------+--------+--------+----------|
| 100MHz | 66MHz | 1.5x | Open | Open | 3 & 4 |
|---------+--------+------------+--------+--------+----------|
| 120MHz | 60MHz | 2x | Closed | Open | 1 & 2 |
|---------+--------+------------+--------+--------+----------|
| 133MHz | 66MHz | 2x | Closed | Open | 3 & 4 |
|---------+--------+------------+--------+--------+----------|
| 150MHz | 60MHz | 2.5x | Closed | Closed | 1 & 2 |
|---------+--------+------------+--------+--------+----------|
| 166MHz | 66MHz | 2.5x | Closed | Closed | 3 & 4 |
|---------+--------+------------+--------+--------+----------|
| 200MHz | 66MHz | 3x | Open | Closed | 3 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP32 | JP33 | JP34 |
|---------------+--------------+--------------+--------------|
| 3.3v | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 3.45v | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 3.52v | Open | Open | Closed |
+------------------------------------------------------------+