J-MARK COMPUTER CORPORATION
J-648A
|
Processor |
CX M1/IBM 6X86/AM K5/Pentium |
|
Processor Speed |
75/90/100/120/133/150/166/200MHz |
|
Chip Set |
SIS |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
512MB (EDO supported) |
|
Maximum Video Memory |
None |
|
Cache |
256/512KB |
|
BIOS |
Award |
|
Dimensions |
250mm x 220mm |
|
I/O Options |
32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VGA feature connector, VGA interface, IR connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Chassis fan power |
CN1 |
Parallel port |
J6 |
|
Speaker |
CN2 |
Serial port 2 |
J7 |
|
Reset switch |
CN3 |
Floppy drive interface |
J8 |
|
Turbo LED |
CN4 |
IR connector |
J9 |
|
Turbo switch |
CN5 |
VGA feature connector |
J10 |
|
IDE interface LED |
CN6 |
VGA interface |
J11 |
|
Green PC connector |
CN7 |
IDE interface 2 |
J14 |
|
Power LED & keylock |
CN8 |
IDE interface 1 |
J15 |
|
PS/2 mouse interface |
J1 |
32-bit PCI slots |
PC1 PC3 |
|
Serial port 1 |
J2 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
CMOS memory normal operation |
J18 |
Pins 2 & 3 closed |
|
CMOS memory clear |
J18 |
Pins 3 & 4 closed | |
|
Flash BIOS voltage select 12v |
JP5 |
Pins 1 & 2 closed | |
|
Flash BIOS voltage select 5v |
JP5 |
Pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP10 |
Unidentified |
|
|
Factory configured - do not alter |
JP18 |
Unidentified |
|
|
Factory configured - do not alter |
JP25 |
Unidentified |
|
Monitor type select color |
JP29 |
Closed | |
|
Monitor type select monochrome |
JP29 |
Open | |
|
PS/2 mouse IRQ12 enabled |
JP48 |
Closed | |
|
PS/2 mouse IRQ12 disabled |
JP48 |
Open | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
4MB |
(2) 512K x 36 |
None |
|
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 |
|
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 |
|
DRAM CONFIGURATION (CONT) | ||
|
Size |
Bank 0 |
Bank 1 |
|
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) 32M x 36 |
None |
|
256MB |
(2) 16M x 36 |
(2) 16M x 36 |
|
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 | ||
|
Size |
Bank 0 |
TAG |
|
256KB |
(2) 32K x 32 |
(1) 32K x 8 |
|
512KB |
(2) 64K x 32 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
JP3 |
|
256KB |
Open |
|
512KB |
Closed |
|
CPU SPEED SELECTION (CYRIX) | ||||||
|
CPU speed |
Clock speed |
Multiplier |
JP4 |
JP9 |
JP11 |
JP26 |
|
120MHz |
50MHz |
2x |
Closed |
Open |
Closed |
1 & 2, 3 & 4 |
|
133MHz |
66MHz |
2x |
Closed |
Open |
Closed |
Open |
|
150MHz |
60MHz |
2x |
Closed |
Open |
Closed |
1 & 2 |
|
166MHz |
66MHz |
2x |
Closed |
Open |
Closed |
3 & 4 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU SPEED SELECTION (IBM) | ||||||
|
CPU speed |
Clock speed |
Multiplier |
JP4 |
JP9 |
JP11 |
JP26 |
|
133MHz |
55MHz |
2x |
Closed |
Open |
Closed |
Open |
|
150MHz |
60MHz |
2x |
Closed |
Open |
Closed |
1 & 2 |
|
166MHz |
66MHz |
2x |
Closed |
Open |
Closed |
3 & 4 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU SPEED SELECTION (AMD) | ||||||
|
CPU speed |
Clock speed |
Multiplier |
JP4 |
JP9 |
JP11 |
JP26 |
|
90MHz |
60MHz |
1.5x |
Open |
Open |
Open |
1 & 2 |
|
100MHz |
66MHz |
2x |
Open |
Open |
Open |
3 & 4 |
|
133MHz |
66MHz |
2x |
Open |
Open |
Open |
3 & 4 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU SPEED SELECTION (INTEL) | ||||||
|
CPU speed |
Clock speed |
Multiplier |
JP4 |
JP9 |
JP11 |
JP26 |
|
75MHz |
50MHz |
1.5x |
Open |
Open |
Open |
1 & 2, 3 & 4 |
|
90MHz |
60MHz |
1.5x |
Open |
Open |
Open |
1 & 2 |
|
100MHz |
66MHz |
1.5x |
Open |
Open |
Open |
3 & 4 |
|
120MHz |
60MHz |
2x |
Open |
Open |
Closed |
1 & 2 |
|
133MHz |
66MHz |
2x |
Open |
Open |
Closed |
3 & 4 |
|
150MHz |
60MHz |
2.5x |
Open |
Closed |
Closed |
1 & 2 |
|
166MHz |
66MHz |
2.5x |
Open |
Closed |
Closed |
3 & 4 |
|
200MHz |
66MHz |
3x |
Open |
Closed |
Open |
3 & 4 |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU VOLTAGE SELECTION | |
|
Voltage |
JP16 |
|
3.3v |
Pins 1 & 2 closed |
|
3.45v |
Pins 3 & 4 closed |
|
3.52v |
Pins 5 & 6 closed |