J-MARK COMPUTER CORPORATION
J-756BF
| Device Type | Mainboard |
| Processor | Pentium II |
| Processor Speed | 233/266/300/333/350/400/450MHz |
| Chip Set | SIS 5595 |
| Video Chip Set | SIS |
| Maximum Onboard Memory | 768MB (EDO & SDRAM supported) (Unified Memory Architecture UMA) |
| Audio Chip Set | CMI |
| Cache | 256/512KB (located on Pentium II CPU) |
| BIOS | Award |
| Dimensions | 230mm x 220mm |
| I/O Options | 32-bit PCI slots (3), floppy drive interface, game interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VGA interface, IR connector, USB connectors (2), ATX power connector, audio in – CD-ROMs (2), wake on LAN connector |
CONNECTIONS |
|||
| Purpose | Location |
Purpose | Location |
| ATX power connector | ATX |
Turbo switch | J8D |
| Serial port 2 | CN1 |
Power LED & keylock | J8E |
| Serial port 1 | CN2 |
IDE interface LED | J9/pins 1 & 3 |
| VGA interface | CN3 |
Soft off power supply | J10 |
| IDE interface 2 | CN4 |
CPU fan power | JP2 |
| IDE interface 1 | CN5 |
Game interface | JP9 |
| IR connector | IR1 |
Audio connector | JP10 |
| Parallel port | J3 |
Floppy drive interface | JP11 |
| Audio in – CD-ROM | J5 |
Chassis fan power | JP15 |
| Audio in – CD-ROM | J6 |
32-bit PCI slots | PC1 – PC3 |
| Digital line out | J7/pins 1 & 2 |
PS/2 mouse interface | PS1 |
| Digital line in | J7/pins 3 & 4 |
USB connector 1 | USB1 |
| Turbo LED | J8A |
USB connector 2 | USB2 |
| Reset switch | J8B |
Wake on LAN connector | WOL |
| Speaker | J8C |
||
USER CONFIGURABLE SETTINGS |
|||
Function |
Label |
Position |
|
» |
Factory configured - do not alter | J4 |
Unidentified |
» |
Factory configured - do not alter | JP1 |
Unidentified |
» |
Factory configured - do not alter | JP4 |
Unidentified |
» |
Factory configured - do not alter | JP7 |
Unidentified |
» |
Factory configured - do not alter | JP8 |
Unidentified |
| PS/2 mouse IRQ12 enabled | JP12 |
Closed |
|
| PS/2 mouse IRQ12 disabled | JP12 |
Open |
|
» |
CMOS memory normal operation | JP14 |
Pins 1 & 2 closed |
| CMOS memory clear | JP14 |
Pins 2 & 3 closed |
|
| On board sound enabled | JP16 |
Open |
|
| On board sound disabled | JP16 |
Closed |
|
» |
Factory configured - do not alter | T1 |
Unidentified |
» |
Factory configured - do not alter | U13/8 |
Unidentified |
DIMM CONFIGURATION |
|||
Size |
Bank 0 |
Bank 1 |
Bank 2 |
8MB |
(1) 1M x 64 |
None |
None |
16MB |
(1) 2M x 64 |
None |
None |
16MB |
(1) 1M x 64 |
(1) 1M x 64 |
None |
24MB |
(1) 2M x 64 |
(1) 1M x 64 |
None |
24MB |
(1) 1M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
32MB |
(1) 4M x 64 |
None |
None |
32MB |
(1) 2M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
32MB |
(1) 2M x 64 |
(1) 2M x 64 |
None |
40MB |
(1) 4M x 64 |
(1) 1M x 64 |
None |
40MB |
(1) 2M x 64 |
(1) 2M x 64 |
(1) 1M x 64 |
48MB |
(1) 4M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
48MB |
(1) 4M x 64 |
(1) 2M x 64 |
None |
48MB |
(1) 2M x 64 |
(1) 2M x 64 |
(1) 2M x 64 |
DIMM CONFIGURATION (CON’T) |
|||
Size |
Bank 0 |
Bank 1 |
Bank 2 |
56MB |
(1) 4M x 64 |
(1) 2M x 64 |
(1) 1M x 64 |
64MB |
(1) 8M x 64 |
None |
None |
64MB |
(1) 4M x 64 |
(1) 2M x 64 |
(1) 2M x 64 |
64MB |
(1) 4M x 64 |
(1) 4M x 64 |
None |
72MB |
(1) 8M x 64 |
(1) 1M x 64 |
None |
72MB |
(1) 4M x 64 |
(1) 4M x 64 |
(1) 1M x 64 |
80MB |
(1) 8M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
80MB |
(1) 8M x 64 |
(1) 2M x 64 |
None |
80MB |
(1) 4M x 64 |
(1) 4M x 64 |
(1) 2M x 64 |
88MB |
(1) 8M x 64 |
(1) 2M x 64 |
(1) 1M x 64 |
96MB |
(1) 8M x 64 |
(1) 2M x 64 |
(1) 2M x 64 |
96MB |
(1) 8M x 64 |
(1) 4M x 64 |
None |
96MB |
(1) 4M x 64 |
(1) 4M x 64 |
(1) 4M x 64 |
104MB |
(1) 8M x 64 |
(1) 4M x 64 |
(1) 1M x 64 |
112MB |
(1) 8M x 64 |
(1) 4M x 64 |
(1) 2M x 64 |
128MB |
(1) 16M x 64 |
None |
None |
128MB |
(1) 8M x 64 |
(1) 4M x 64 |
(1) 4M x 64 |
128MB |
(1) 8M x 64 |
(1) 8M x 64 |
None |
136MB |
(1) 16M x 64 |
(1) 1M x 64 |
None |
136MB |
(1) 8M x 64 |
(1) 8M x 64 |
(1) 1M x 64 |
144MB |
(1) 16M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
144MB |
(1) 16M x 64 |
(1) 2M x 64 |
None |
144MB |
(1) 8M x 64 |
(1) 8M x 64 |
(1) 2M x 64 |
152MB |
(1) 16M x 64 |
(1) 2M x 64 |
(1) 1M x 64 |
160MB |
(1) 16M x 64 |
(1) 2M x 64 |
(1) 2M x 64 |
160MB |
(1) 16M x 64 |
(1) 4M x 64 |
None |
160MB |
(1) 8M x 64 |
(1) 8M x 64 |
(1) 4M x 64 |
192MB |
(1) 16M x 64 |
(1) 4M x 64 |
(1) 4M x 64 |
192MB |
(1) 16M x 64 |
(1) 8M x 64 |
None |
192MB |
(1) 8M x 64 |
(1) 8M x 64 |
(1) 8M x 64 |
200MB |
(1) 16M x 64 |
(1) 8M x 64 |
(1) 1M x 64 |
208MB |
(1) 16M x 64 |
(1) 8M x 64 |
(1) 2M x 64 |
256MB |
(1) 32M x 64 |
None |
None |
256MB |
(1) 16M x 64 |
(1) 8M x 64 |
(1) 8M x 64 |
264MB |
(1) 32M x 64 |
(1) 1M x 64 |
None |
272MB |
(1) 32M x 64 |
(1) 1M x 64 |
(1) 1M x 64 |
272MB |
(1) 32M x 64 |
(1) 2M x 64 |
None |
288MB |
(1) 32M x 64 |
(1) 2M x 64 |
(1) 2M x 64 |
288MB |
(1) 32M x 64 |
(1) 4M x 64 |
None |
320MB |
(1) 32M x 64 |
(1) 4M x 64 |
(1) 4M x 64 |
320MB |
(1) 32M x 64 |
(1) 8M x 64 |
None |
384MB |
(1) 32M x 64 |
(1) 8M x 64 |
(1) 8M x 64 |
384MB |
(1) 32M x 64 |
(1) 16M x 64 |
None |
384MB |
(1) 16M x 64 |
(1) 16M x 64 |
(1) 16M x 64 |
512MB |
(1) 32M x 64 |
(1) 16M x 64 |
(1) 16M x 64 |
512MB |
(1) 32M x 64 |
(1) 32M x 64 |
None |
768MB |
(1) 32M x 64 |
(1) 32M x 64 |
(1) 32M x 64 |
| Note: Board accepts EDO & SDRAM memory. | |||
CACHE CONFIGURATION |
| Note: 256KB/512KB cache is located on the Pentium II CPU. |
CPU SPEED SELECTION |
|||||
CPU speed |
Clock speed |
Multiplier |
U13/1 |
U13/2 |
U13/3 |
233MHz |
66MHz |
3.5x |
On |
Off |
On |
266MHz |
66MHz |
4x |
On |
On |
Off |
300MHz |
66MHz |
4.5x |
On |
Off |
Off |
333MHz |
66MHz |
5x |
On |
On |
Off |
350MHz |
100MHz |
3.5x |
On |
Off |
On |
400MHz |
100MHz |
4x |
On |
On |
Off |
450MHz |
100MHz |
4.5x |
On |
Off |
Off |
CPU SPEED SELECTION (CON’T) |
||||||
CPU speed |
Clock speed |
Multiplier |
U13/4 |
U13/5 |
U13/6 |
U13/7 |
233MHz |
66MHz |
3.5x |
Off |
Off |
On |
On |
266MHz |
66MHz |
4x |
On |
Off |
On |
On |
300MHz |
66MHz |
4.5x |
On |
Off |
On |
On |
333MHz |
66MHz |
5x |
Off |
Off |
On |
On |
350MHz |
100MHz |
3.5x |
Off |
Off |
Off |
Off |
400MHz |
100MHz |
4x |
On |
Off |
Off |
Off |
450MHz |
100MHz |
4.5x |
On |
Off |
Off |
Off |