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 |