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# J-MARK COMPUTER CORPORATION
J-591A
Device Type Mainboard
Processor CX 6X86/IBM 6X86/CX 686MX/IDT C6/AM K5/AM
K6/Pentium/Pentium MMX
Processor Speed 90/100/120/133/150/166/180/200/233/266/300MHz
Chip Set SIS 5591
Maximum Onboard 256MB (EDO & SDRAM supported)
Memory
Cache 512KB
BIOS Unidentified
Dimensions 235mm x 220mm
I/O Options 32-bit PCI slots (3), floppy drive interface,
IDE interfaces (2), parallel port, PS/2 mouse
interface, serial ports (2), IR connector,
USB connector, ATX power connector, AGP slot
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| AGP slot | AGP | Serial port 2 | CN1 |
|-------------------+----------+------------------+----------|
| ATX power | ATX | Serial port 1 | CN2 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Turbo LED | C1 | IDE interface 2 | CN3 |
|-------------------+----------+------------------+----------|
| Reset switch | C2 | IDE interface 1 | CN4 |
|-------------------+----------+------------------+----------|
| Speaker | C3 | Floppy drive | CN5 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Turbo switch | C4 | Parallel port | CN6 |
|-------------------+----------+------------------+----------|
| Power LED & | C5 | IR connector | IR1 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| IDE interface LED | C6 | PS/2 mouse | JP1 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Soft off power | C7 | 32-bit PCI slots | PC1 – |
| supply | | | PC3 |
|-------------------+----------+------------------+----------|
| Chassis fan power | C8 | USB connector | USB |
|-------------------+----------+------------------+----------|
| CPU fan power | C9 | SCSI interface | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Keyboard power on disabled | JP2 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Keyboard power on enabled | JP2 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP4 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP4 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP8 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP9 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 8MB | (2) 1M x 36 |
|----------------------------+-------------------------------|
| 16MB | (2) 2M x 36 |
|----------------------------+-------------------------------|
| 32MB | (2) 4M x 36 |
|----------------------------+-------------------------------|
| 64MB | (2) 8M x 36 |
|----------------------------+-------------------------------|
| 128MB | (2) 16M x 36 |
|----------------------------+-------------------------------|
| 256MB | (2) 32M x 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 1 | Bank 2 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 64 | None |
|------------------+--------------------+--------------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 24MB | (1) 2M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 64 | None |
|------------------+--------------------+--------------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 40MB | (1) 4M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 64 | None |
|------------------+--------------------+--------------------|
| 64MB | (1) 4M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 72MB | (1) 8M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 80MB | (1) 8M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 96MB | (1) 8M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 128MB | (1) 16M x 64 | None |
|------------------+--------------------+--------------------|
| 128MB | (1) 8M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 136MB | (1) 16M x 64 | (1) 1M x 64 |
|------------------+--------------------+--------------------|
| 144MB | (1) 16M x 64 | (1) 2M x 64 |
|------------------+--------------------+--------------------|
| 160MB | (1) 16M x 64 | (1) 4M x 64 |
|------------------+--------------------+--------------------|
| 192MB | (1) 16M x 64 | (1) 8M x 64 |
|------------------+--------------------+--------------------|
| 256MB | (1) 16M x 64 | (1) 16M x 64 |
|------------------------------------------------------------|
| Note: Board accepts SDRAM memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 512KB | (1) 64K x 64 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2x | On |Off |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 75MHz | 2x | On |Off |Off | On | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IBM 6X86) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2x | On |Off |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 75MHz | 2x | On |Off |Off | On | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (CX 6X86MX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 60MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 75MHz | 2x | On |Off |Off |Off | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3x |Off | On |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 75MHz | 2.5x | On | On |Off | On | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (IDT C6) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 75MHz | 2x | On |Off |Off | On | On |Off |
|---------+---------+----------+----+----+----+----+----+----|
| 180MHz | 60MHz | 3x |Off | On |Off | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K5) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 90MHz | 60MHz | 1.5x |Off |Off |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 100MHz | 66MHz | 1.5x |Off |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 66MHz | 1.5x |Off |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off |Off | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (AM K6) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3.5x |Off |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 266MHz | 66MHz | 4x | On |Off | On |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 300MHz | 66MHz | 4.5x | On | On | On |Off | On |Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 90MHz | 60MHz | 1.5x |Off |Off |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 100MHz | 66MHz | 1.5x |Off |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 120MHz | 60MHz | 2x | On |Off |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 133MHz | 66MHz | 2x | On |Off |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 150MHz | 60MHz | 2.5x | On | On |Off | On | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off |Off | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (INTEL MMX) |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|U4/1|U4/2|U4/3|U4/4|U4/5|U4/6|
| | speed | | | | | | | |
|---------+---------+----------+----+----+----+----+----+----|
| 166MHz | 66MHz | 2.5x | On | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 200MHz | 66MHz | 3x |Off | On |Off |Off | On | On |
|---------+---------+----------+----+----+----+----+----+----|
| 233MHz | 66MHz | 3.5x |Off |Off |Off |Off | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP10 |
|----------------------------+-------------------------------|
| 2.2v | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.8v | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 2.9v | Pins 5 & 6 closed |
|----------------------------+-------------------------------|
| 3.2v | Pins 7 & 8 closed |
|----------------------------+-------------------------------|
| 3.3v | Pins 9 & 10 closed |
|----------------------------+-------------------------------|
| 3.45v | Pins 11 & 12 closed |
|----------------------------+-------------------------------|
| 3.52v | Pins 13 & 14 closed |
+------------------------------------------------------------+