TEXT View Source
# J-MARK COMPUTER CORPORATION
J-648AP
Processor CX M1/IBM 6X86/AM K5/Pentium
Processor Speed 75/90/100/120/133/150/166/200MHz
Chip Set SIS
Video Chip Set None
Maximum Onboard 512MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 256/512KB
BIOS Award
Dimensions 250mm 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), VGA feature connector, VGA
interface, IR connector
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Chassis fan power | CN1 | Parallel port | J6 |
|-------------------+----------+------------------+----------|
| Speaker | CN2 | Serial port 2 | J7 |
|-------------------+----------+------------------+----------|
| Reset switch | CN3 | Floppy drive | J8 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Turbo LED | CN4 | IR connector | J9 |
|-------------------+----------+------------------+----------|
| Turbo switch | CN5 | VGA feature | J10 |
| | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface LED | CN6 | VGA interface | J11 |
|-------------------+----------+------------------+----------|
| Green PC | CN7 | IDE interface 2 | J14 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Power LED & | CN8 | IDE interface 1 | J15 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| PS/2 mouse | J1 | 32-bit PCI slots | PC1 – |
| interface | | | PC3 |
|-------------------+----------+------------------+----------|
| Serial port 1 | J2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | CMOS memory normal operation | J18 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J18 | Pins 3 & 4 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 12v | JP5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS voltage select 5v | JP5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP10 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP18 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP25 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | Monitor type select color | JP29 | Closed |
|---+---------------------------------+-------+--------------|
| | Monitor type select monochrome | JP29 | Open |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 enabled | JP48 | Closed |
|---+---------------------------------+-------+--------------|
| | PS/2 mouse IRQ12 disabled | JP48 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 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) 32M x 36 | None |
|------------------+--------------------+--------------------|
| 256MB | (2) 16M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 264MB | (2) 32M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 272MB | (2) 32M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 288MB | (2) 32M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 320MB | (2) 32M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 384MB | (2) 32M x 36 | (2) 16M x 36 |
|------------------+--------------------+--------------------|
| 512MB | (2) 32M x 36 | (2) 32M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 256KB | (2) 32K x 32 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (2) 64K x 32 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 |
|-----------------------------+------------------------------|
| 256KB | Open |
|-----------------------------+------------------------------|
| 512KB | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CYRIX) |
|------------------------------------------------------------|
|CPU speed |Clock |Multiplier| JP4 |JP9 | JP11 | JP26 |
| |speed | | | | | |
|----------+------+----------+------+----+------+------------|
| 120MHz |50MHz | 2x |Closed|Open|Closed|1 & 2, 3 & 4|
|----------+------+----------+------+----+------+------------|
| 133MHz |66MHz | 2x |Closed|Open|Closed| Open |
|----------+------+----------+------+----+------+------------|
| 150MHz |60MHz | 2x |Closed|Open|Closed| 1 & 2 |
|----------+------+----------+------+----+------+------------|
| 166MHz |66MHz | 2x |Closed|Open|Closed| 3 & 4 |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM) |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier| JP4 | JP9 | JP11 |JP26 |
|---------+-----------+----------+-------+-----+-------+-----|
| 133MHz | 55MHz | 2x |Closed |Open |Closed |Open |
|---------+-----------+----------+-------+-----+-------+-----|
| 150MHz | 60MHz | 2x |Closed |Open |Closed |1 & 2|
|---------+-----------+----------+-------+-----+-------+-----|
| 166MHz | 66MHz | 2x |Closed |Open |Closed |3 & 4|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AMD) |
|------------------------------------------------------------|
| CPU | Clock | Multiplier | JP4 | JP9 | JP11 | JP26 |
| speed | speed | | | | | |
|---------+--------+------------+------+------+------+-------|
| 90MHz | 60MHz | 1.5x | Open | Open | Open | 1 & 2 |
|---------+--------+------------+------+------+------+-------|
| 100MHz | 66MHz | 2x | Open | Open | Open | 3 & 4 |
|---------+--------+------------+------+------+------+-------|
| 133MHz | 66MHz | 2x | Open | Open | Open | 3 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
|CPU speed |Clock |Multiplier|JP4 | JP9 | JP11 | JP26 |
| |speed | | | | | |
|----------+------+----------+----+------+------+------------|
| 75MHz |50MHz | 1.5x |Open| Open | Open |1 & 2, 3 & 4|
|----------+------+----------+----+------+------+------------|
| 90MHz |60MHz | 1.5x |Open| Open | Open | 1 & 2 |
|----------+------+----------+----+------+------+------------|
| 100MHz |66MHz | 1.5x |Open| Open | Open | 3 & 4 |
|----------+------+----------+----+------+------+------------|
| 120MHz |60MHz | 2x |Open| Open |Closed| 1 & 2 |
|----------+------+----------+----+------+------+------------|
| 133MHz |66MHz | 2x |Open| Open |Closed| 3 & 4 |
|----------+------+----------+----+------+------+------------|
| 150MHz |60MHz | 2.5x |Open|Closed|Closed| 1 & 2 |
|----------+------+----------+----+------+------+------------|
| 166MHz |66MHz | 2.5x |Open|Closed|Closed| 3 & 4 |
|----------+------+----------+----+------+------+------------|
| 200MHz |66MHz | 3x |Open|Closed| Open | 3 & 4 |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | V core | JP16 | JP17 |
|----------+---------+-------------------+-------------------|
| 3.3v | 2.8v | Pins 1 & 2 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.45v | Pins 3 & 4 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.3v | 3.52v | Pins 5 & 6 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 3.45v | 2.8v | Pins 1 & 2 closed | Pins 3 & 4 closed |
|----------+---------+-------------------+-------------------|
| 3.45v | 3.45v | Pins 3 & 4 closed | Pins 3 & 4 closed |
|----------+---------+-------------------+-------------------|
| 3.45v | 3.52v | Pins 5 & 6 closed | Pins 3 & 4 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 2.8v | Pins 1 & 2 closed | Pins 5 & 6 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 3.45v | Pins 3 & 4 closed | Pins 5 & 6 closed |
|----------+---------+-------------------+-------------------|
| 3.52v | 3.52v | Pins 5 & 6 closed | Pins 5 & 6 closed |
+------------------------------------------------------------+