J-MARK COMPUTER CORPORATION
J-656C
Processor | CX M1/Pentium |
Processor Speed | 75/90/100/120/133/150/166/180/200MHz |
Chip Set | Intel |
Video Chip Set | None |
Maximum Onboard Memory | 128MB (EDO supported) |
Maximum Video Memory | None |
Cache | 256/512KB |
BIOS | Award |
Dimensions | 255mm x 220mm |
I/O Options | 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), cache slot |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
IDE interface 2 | J1 | IDE interface LED | JP6 pins 14 & 15 |
IDE interface 1 | J2 | Turbo switch | JP6 pins 18 & 19 |
Serial port 2 | J7 | Reset switch | JP6 pins 22 & 23 |
Serial port 1 | J8 | Turbo LED | JP6 pins 25 & 26 |
Floppy drive interface | J9 | Parallel port | JP15 |
Power LED & keylock | JP6 pins 1 - 5 | 32-bit PCI slots | PC1 – PC4 |
Green PC connector | JP6 pins 7 & 8 | PS/2 mouse interface | PS2 |
Speaker | JP6 pins 10 - 13 | Cache slot | SL1 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | Factory configured - do not alter | J5 | Unidentified |
» | CMOS memory normal operation | JP3 | Open |
CMOS memory clear | JP3 | Closed | |
Flash BIOS voltage select 12v | JP5 | Pins 1 & 2 closed | |
Flash BIOS voltage select 5v | JP5 | Pins 2 & 3 closed | |
» | ISA clock select PCI CLK/4 | JP8 | Pins 2 & 3 closed |
ISA clock select PCI CLK/3 | JP8 | Pins 1 & 2 closed | |
» | Factory configured - do not alter | JP13 | Unidentified |
» | Factory configured - do not alter | JV1 | Unidentified |
» | Factory configured - do not alter | JW1 | Unidentified |
» | Factory configured - do not alter | JW2 | 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 |
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 at 64MB and above. |
CACHE CONFIGURATION | |||
Size | Bank 0 | SL1 | TAG |
256KB (A) | (2) 32K x 32 | Not installed | (1) 32K x 8 |
256KB (B) | None | 256KB module installed | (1) 32K x 8 |
512KB (A) | (2) 32K x 32 | 256KB module installed | (1) 32K x 8 |
512KB (B) | None | 512KB module installed | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JC1 | JC2 | JT2 | JX2 |
256KB (A) | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
256KB (B) | N/A | N/A | N/A | N/A |
512KB (A) | Pins 2 & 3 closed | Pins 1 & 2 closed | Pins 2 & 3 closed | Pins 1 & 2 closed |
512KB (B) | N/A | N/A | N/A | N/A |
CACHE TYPE CONFIGURATION | |
Type | JP101 |
Asynchronous | Closed |
Synchronous | Open |
CPU SPEED SELECTION (CYRIX) | |||||
CPU speed | Clock speed | Multiplier | JF1 | J1 | J3 |
120MHz | 50MHz | 2x | 3 & 4 | Closed | Open |
150MHz | 60MHz | 2x | 1 & 2 | Closed | Open |
166MHz | 66MHz | 2x | Open | Closed | Open |
Note: Pins designated should be in the closed position. |
CPU SPEED SELECTION (INTEL) | |||||
CPU speed | Clock speed | Multiplier | JF1 | J1 | J3 |
75MHz | 50MHz | 1.5x | 3 & 4 | Open | Open |
90MHz | 60MHz | 1.5x | 1 & 2 | Open | Open |
100MHz | 66MHz | 1.5x | Open | Open | Open |
120MHz | 60MHz | 2x | 1 & 2 | Closed | Open |
133MHz | 66MHz | 2x | Open | Closed | Open |
150MHz | 60MHz | 2.5x | 1 & 2 | Closed | Closed |
166MHz | 66MHz | 2.5x | Open | Closed | Closed |
180MHz | 60MHz | 3x | 1 & 2 | Open | Closed |
200MHz | 66MHz | 3x | Open | Open | Closed |
Note: Pins designated should be in the closed position. |
CPU VOLTAGE SELECTION | ||
Voltage | JV2 | |
3.3v | Pins 1 & 2 closed | |
» | 3.45v | Pins 3 & 4 closed |
3.6v | Pins 5 & 6 closed |
CPU CLOCK TOLERANCE SELECTION | ||
Tolerance | JP7 | |
3.3v | Pins 2 & 3 closed | |
» | 5v | Pins 1 & 2 closed |