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# J-MARK COMPUTER CORPORATION
J-656C
Processor CX M1/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 128MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 255mm x 220mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), cache slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+------------+----------------+-----------|
| IDE interface 2 | J1 | IDE interface | JP6 pins |
| | | LED | 14 & 15 |
|------------------+------------+----------------+-----------|
| IDE interface 1 | J2 | Turbo switch | JP6 pins |
| | | | 18 & 19 |
|------------------+------------+----------------+-----------|
| Serial port 2 | J7 | Reset switch | JP6 pins |
| | | | 22 & 23 |
|------------------+------------+----------------+-----------|
| Serial port 1 | J8 | Turbo LED | JP6 pins |
| | | | 25 & 26 |
|------------------+------------+----------------+-----------|
| Floppy drive | J9 | Parallel port | JP15 |
| interface | | | |
|------------------+------------+----------------+-----------|
| Power LED & | JP6 pins 1 | 32-bit PCI | PC1 – PC4 |
| keylock | - 5 | slots | |
|------------------+------------+----------------+-----------|
| Green PC | JP6 pins 7 | PS/2 mouse | PS2 |
| connector | & 8 | interface | |
|------------------+------------+----------------+-----------|
| Speaker | JP6 pins | Cache slot | SL1 |
| | 10 - 13 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J5 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP3 | Open |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP3 | Closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | ISA clock select PCI CLK/4 | JP8 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | ISA clock select PCI CLK/3 | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JV1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JW1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JW2 | 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 |
|---------------+-----------------------+--------------------|
| 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 at 64MB and above. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | JC1 | JC2 | JT2 | JX2 |
|-----------+------------+-----------+-----------+-----------|
| 256KB (A) | Pins 1 & 2 | Pins 1 & | Pins 1 & | Pins 1 & |
| | closed | 2 closed | 2 closed | 2 closed |
|-----------+------------+-----------+-----------+-----------|
| 256KB (B) | N/A | N/A | N/A | N/A |
|-----------+------------+-----------+-----------+-----------|
| 512KB (A) | Pins 2 & 3 | Pins 1 & | Pins 2 & | Pins 1 & |
| | closed | 2 closed | 3 closed | 2 closed |
|-----------+------------+-----------+-----------+-----------|
| 512KB (B) | N/A | N/A | N/A | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP101 |
|-------------------------------+----------------------------|
| Asynchronous | Closed |
|-------------------------------+----------------------------|
| Synchronous | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
| CPU speed | Clock | Multiplier | JF1 | J1 | J3 |
| | speed | | | | |
|------------+----------+------------+-------+--------+------|
| 120MHz | 50MHz | 2x | 3 & 4 | Closed | Open |
|------------+----------+------------+-------+--------+------|
| 150MHz | 60MHz | 2x | 1 & 2 | Closed | Open |
|------------+----------+------------+-------+--------+------|
| 166MHz | 66MHz | 2x | Open | Closed | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JF1 | J1 | J3 |
| speed | speed | | | | |
|----------+----------+------------+-------+--------+--------|
| 75MHz | 50MHz | 1.5x | 3 & 4 | Open | Open |
|----------+----------+------------+-------+--------+--------|
| 90MHz | 60MHz | 1.5x | 1 & 2 | Open | Open |
|----------+----------+------------+-------+--------+--------|
| 100MHz | 66MHz | 1.5x | Open | Open | Open |
|----------+----------+------------+-------+--------+--------|
| 120MHz | 60MHz | 2x | 1 & 2 | Closed | Open |
|----------+----------+------------+-------+--------+--------|
| 133MHz | 66MHz | 2x | Open | Closed | Open |
|----------+----------+------------+-------+--------+--------|
| 150MHz | 60MHz | 2.5x | 1 & 2 | Closed | Closed |
|----------+----------+------------+-------+--------+--------|
| 166MHz | 66MHz | 2.5x | Open | Closed | Closed |
|----------+----------+------------+-------+--------+--------|
| 180MHz | 60MHz | 3x | 1 & 2 | Open | Closed |
|----------+----------+------------+-------+--------+--------|
| 200MHz | 66MHz | 3x | Open | Open | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JV2 |
|----------------------------+-------------------------------|
| | 3.3v | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| » | 3.45v | Pins 3 & 4 closed |
|---+------------------------+-------------------------------|
| | 3.6v | Pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK TOLERANCE SELECTION |
|------------------------------------------------------------|
| Tolerance | JP7 |
|----------------------------+-------------------------------|
| | 3.3v | Pins 2 & 3 closed |
|----+-----------------------+-------------------------------|
| » | 5v | Pins 1 & 2 closed |
+------------------------------------------------------------+