J-MARK COMPUTER CORPORATION
J-656B
|
Processor |
Pentium |
|
Processor Speed |
75/90/100/120/133/150/180/200MHz |
|
Chip Set |
Intel |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
128MB (EDO supported) |
|
Maximum Video Memory |
None |
|
Cache |
256/512KB |
|
BIOS |
Award |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit PCI slots (4), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VRM connector. IR connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Serial port 2 |
CN1 |
Speaker |
J4 |
|
Serial port 1 |
CN2 |
Power LED & keylock |
J5 |
|
Parallel port |
CN3 |
Turbo LED |
J6 |
|
Floppy drive interface |
CN4 |
Turbo switch |
J7 |
|
IDE interface 2 |
CN5 |
IR connector |
JP8 |
|
IDE interface 1 |
CN6 |
PS/2 mouse interface |
MS1 |
|
Reset switch |
J2 |
32-bit PCI slots |
PC1 PC4 |
|
IDE interface LED |
J3 |
VRM connector |
VRM |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Factory configured - do not alter |
J8 |
Unidentified |
|
|
Factory configured - do not alter |
J9 |
Unidentified |
|
|
PCI CLK select CLK/4 |
JP3 |
Pins 2 & 3 closed |
|
PCI CLK select CLK/3 |
JP3 |
Pins 1 & 2 closed | |
|
|
I/O address select 250 HEX |
JP4 |
Pins 2 & 3 closed |
|
I/O address select 3F0 HEX |
JP4 |
Pins 1 & 2 closed | |
|
|
IDE interface 1 IRQ select IRQ14 |
JP5 |
Pins 1 & 2 closed |
|
IDE interface 1 IRQ select MIRQ1 |
JP5 |
Pins 2 & 3 closed | |
|
|
IDE interface 2 IRQ select IRQ15 |
JP6 |
Pins 1 & 2 closed |
|
IDE interface 2 IRQ select MIRQ0 |
JP6 |
Pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP9 |
Unidentified |
|
|
Green PC disabled |
JP10 |
Open |
|
Green PC enabled |
JP10 |
Closed | |
|
|
Factory configured - do not alter |
JP13 |
Unidentified |
|
|
Factory configured - do not alter |
JP15 |
Unidentified |
|
|
Factory configured - do not alter |
JP16 |
Unidentified |
|
|
CMOS memory normal operation |
JP17 |
Open |
|
CMOS memory clear |
JP17 |
Closed | |
|
|
CPU type select write back |
JP18 |
Open |
|
CPU type select write through |
JP18 |
Closed | |
|
|
CPU pipeline enabled |
JP19 |
Closed |
|
CPU pipeline disabled |
JP19 |
Open | |
|
|
Factory configured - do not alter |
JP20 |
Unidentified |
|
|
Factory configured - do not alter |
JP24 |
Unidentified |
|
|
Factory configured - do not alter |
JP32 |
Unidentified |
|
DRAM 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 |
|
DRAM CONFIGURATION (CONT) | ||
|
Size |
Bank 0 |
Bank 1 |
|
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 |
|
128MB |
(2) 8M x 36 |
(2) 8M x 36 |
|
Note: Board accepts EDO memory. Board also accepts x 32 SIMMs. Banks are interchangeable. | ||
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
256KB (A) |
(2) 32K x 32 |
None |
(1) 8K x 8 |
|
256KB (B) |
None |
(8) 32K x 8 |
(1) 8K x 8 |
|
512KB (A) |
(2) 64K x 32 |
None |
(1) 16K/32K x 8 |
|
512KB (B) |
None |
(8) 64K x 8 |
(1) 16K/32K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
JP14 |
|
256KB (A) |
Pins 1 & 2 closed |
|
256KB (B) |
Pins 1 & 2 closed |
|
512KB (A) |
Pins 2 & 3 closed |
|
512KB (B) |
Pins 2 & 3 closed |
|
CACHE VOLTAGE CONFIGURATION | ||
|
Voltage |
JP1 |
JP2 |
|
3v synchronous |
Open |
Pins 1 & 2, 3 & 4, 5 & 6 closed |
|
3v asynchronous |
Open |
Pins 1 & 2, 3 & 4, 5 & 6 closed |
|
5v mixed asynchronous |
Pins 1 & 2, 3 & 4, 5 & 6 closed |
Open |
|
CPU SPEED SELECTION | ||||||
|
CPU speed |
Clock speed |
Multiplier |
JP11 |
JP12 |
JP26 |
JP27 |
|
75MHz |
50MHz |
1.5x |
Open |
Open |
Open |
Open |
|
90MHz |
60MHz |
1.5x |
Open |
Closed |
Open |
Open |
|
100MHz |
66MHz |
1.5x |
Closed |
Closed |
Open |
Open |
|
120MHz |
60MHz |
2x |
Open |
Closed |
Open |
Closed |
|
133MHz |
66MHz |
2x |
Closed |
Closed |
Open |
Closed |
|
150MHz |
60MHz |
2.5x |
Open |
Closed |
Closed |
Closed |
|
180MHz |
60MHz |
3x |
Open |
Closed |
Closed |
Open |
|
200MHz |
66MHz |
3x |
Closed |
Closed |
Closed |
Open |
|
CPU VOLTAGE SELECTION | |||
|
Voltage |
JP28 |
JP29 |
JP30 |
|
3.3v |
Closed |
Open |
Open |
|
3.45v |
Open |
Closed |
Open |
|
3.6v |
Open |
Open |
Closed |
|
BIOS SELECTION | |||
|
Setting |
JP21 |
JP31 | |
|
EPROM |
Pins 1 & 2 closed |
Pins 2 & 3 closed | |
|
12v flash |
Pins 2 & 3 closed |
Pins 1 & 2 closed | |
|
5v flash |
Pins 2 & 3 closed |
Pins 2 & 3 closed | |