J-MARK COMPUTER CORPORATION
J-756A
|
Device Type |
Mainboard |
|
Processor |
Pentium Pro |
|
Processor Speed |
150/180/200MHz |
|
Chip Set |
Intel 440FX |
|
Maximum Onboard Memory |
512MB (EDO supported) |
|
Cache |
256/512KB (located on Pentium Pro CPU) |
|
BIOS |
Unidentified |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), IR connector, USB connectors (2) |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
IDE interface LED |
C1 |
Serial port 1 |
J7 |
|
Turbo LED |
C2 |
Floppy drive interface |
J8 |
|
Reset switch |
C3 |
IDE interface 2 |
J9 |
|
Speaker |
C4 |
CPU fan power |
J11 |
|
Green PC connector |
C5 |
External battery |
J19 |
|
Turbo switch |
C6 |
IR connector |
JP1 |
|
Power LED & keylock |
C7 |
USB connector 1 |
JP2 |
|
Serial port 2 |
J4 |
USB connector 2 |
JP3 |
|
Parallel port |
J5 |
32-bit PCI slots |
PC1 – PC4 |
|
IDE interface 1 |
J6 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
» |
CMOS memory normal operation |
J19 |
Pins 2 & 3 closed |
|
CMOS memory clear |
J19 |
Pins 3 & 4 closed | |
|
Battery type select external |
J19 |
Open | |
|
Flash BIOS voltage select 12v |
JP15 |
Pins 2 & 3 closed | |
|
Flash BIOS voltage select 5v |
JP15 |
Pins 1 & 2 closed | |
|
» |
CMOS memory normal operation |
JP23 |
Open |
|
CMOS memory clear |
JP23 |
Closed | |
|
PS/2 mouse IRQ enabled |
JP25 |
Closed | |
|
PS/2 mouse IRQ disabled |
JP25 |
Open | |
|
SIMM 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 |
|
SIMM CONFIGURATION (CON’T) | ||
|
Size |
Bank 0 |
Bank 1 |
|
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 |
|
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) 16M x 36 |
(2) 16M x 36 |
|
256MB |
(2) 32M x 36 |
None |
|
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 |
|
Note: 256KB/512KB cache is located on the Pentium Pro CPU. |
|
CPU SPEED SELECTION | ||||||||
|
CPU speed |
Clock speed |
Multiplier |
JP17 |
JP18 |
JP19 |
JP20 |
JP21 |
JP22 |
|
150MHz |
60MHz |
2.5x |
Open |
Closed |
Open |
Closed |
Closed |
Closed |
|
180MHz |
60MHz |
3x |
Open |
Closed |
Closed |
Open |
Closed |
Closed |
|
200MHz |
66MHz |
3x |
Closed |
Open |
Closed |
Open |
Closed |
Closed |
|
CPU VOLTAGE SELECTION | ||||
|
Voltage |
JP12/pins 1 & 2 |
JP12/pins 3 & 4 |
JP12/pins 5 & 6 |
JP12/pins 7 & 8 |
|
Auto |
Open |
Open |
Open |
Open |
|
2.1v |
Open |
Open |
Open |
Closed |
|
2.2v |
Open |
Open |
Closed |
Open |
|
2.3v |
Open |
Open |
Closed |
Closed |
|
2.4v |
Open |
Closed |
Open |
Open |
|
2.5v |
Open |
Closed |
Open |
Closed |
|
2.6v |
Open |
Closed |
Closed |
Open |
|
2.7v |
Open |
Closed |
Closed |
Closed |
|
2.8v |
Closed |
Open |
Open |
Open |
|
2.9v |
Closed |
Open |
Open |
Closed |
|
3.0v |
Closed |
Open |
Closed |
Open |
|
3.1v |
Closed |
Open |
Closed |
Closed |
|
3.2v |
Closed |
Closed |
Open |
Open |
|
3.3v |
Closed |
Closed |
Open |
Closed |
|
3.4v |
Closed |
Closed |
Closed |
Open |
|
3.5v |
Closed |
Closed |
Closed |
Closed |