J-MARK COMPUTER CORPORATION
J-656VXB
Processor | CX M1/AM K5/Pentium |
Processor Speed | 75/90/100/120/133/150/166/200MHz |
Chip Set | Intel |
Video Chip Set | None |
Maximum Onboard Memory | 128MB (EDO supported) |
Maximum Video Memory | None |
Cache | 256/512KB |
BIOS | Award |
Dimensions | 270mm 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), cache slot, IR connector |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port 1 | CN1 | IDE interface LED | JC5 |
Serial port 2 | CN2 | Power LED & keylock | JC6 |
Parallel port | CN3 | Turbo switch | JC7 |
Floppy drive interface | CN4 | Green PC connector | JC8 |
IDE interface 2 | CN5 | IR connector | JP12 |
IDE interface 1 | CN6 | Chassis fan power | JP21 |
PS/2 mouse interface | J1 | External battery | JP23 |
Speaker | JC2 | 32-bit PCI slots | PC1 – PC3 |
Reset switch | JC3 | Cache slot | SL1 |
Turbo LED | JC4 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | Factory configured - do not alter | J4 | Unidentified |
» | Factory configured - do not alter | JP3 | Unidentified |
PCICLK select PCICLK/4 | JP22 | Closed | |
PCICLK select PCICLK/3 | JP22 | Open | |
PS/2 IRQ12 enabled | JP29 | Closed | |
PS/2 IRQ12 disabled | JP29 | Open | |
Flash BIOS voltage select 12v | JP33 | Pins 1 & 2 closed | |
Flash BIOS voltage select 5v | JP33 | Pins 2 & 3 closed |
DIMM/DRAM CONFIGURATION | |||
Size | Bank 0 | Bank 1 | Bank 2 |
8MB | (2) 1M x 36 | None | None |
8MB | None | None | (1) 1M x 64 |
16MB | (2) 2M x 36 | None | None |
16MB | (2) 1M x 36 | (2) 1M x 36 | None |
16MB | None | None | (1) 2M x 64 |
24MB | (2) 2M x 36 | (2) 1M x 36 | None |
32MB | (2) 4M x 36 | None | None |
32MB | (2) 2M x 36 | (2) 2M x 36 | None |
32MB | None | None | (1) 4M x 64 |
40MB | (2) 4M x 36 | (2) 1M x 36 | None |
48MB | (2) 4M x 36 | (2) 2M x 36 | None |
DIMM/DRAM CONFIGURATION (CON’T) | |||
Size | Bank 0 | Bank 1 | Bank 2 |
64MB | (2) 8M x 36 | None | None |
64MB | (2) 4M x 36 | (2) 4M x 36 | None |
72MB | (2) 8M x 36 | (2) 1M x 36 | None |
80MB | (2) 8M x 36 | (2) 2M x 36 | None |
96MB | (2) 8M x 36 | (2) 4M x 36 | None |
128MB | (2) 8M x 36 | (2) 8M x 36 | None |
Note: Board accepts EDO memory. |
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 | JP1 | JP2 | JP7 | JP8 |
256KB (A) | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
256KB (B) | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
512KB (A, Jet-Way module) | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
512KB (A, Intel module) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
512KB (B, Jet-Way module) | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
512KB (B, Intel module) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
Note: Pins designated should be in the closed position. |
CPU SPEED SELECTION (CYRIX) | |||||
CPU speed | Clock speed | Multiplier | J5 | JP13 | JP14 |
120MHz | 50MHz | 2x | 3 & 4, 5 & 6 | Closed | Open |
133MHz | 55MHz | 2x | 3 & 4 | Closed | Open |
150MHz | 60MHz | 2x | 5 & 6 | Closed | Open |
166MHz | 66MHz | 2x | Open | Closed | Open |
Note: Pins designated should be in the closed position. |
CPU SPEED SELECTION (AMD) | |||||
CPU speed | Clock speed | Multiplier | J5 | JP13 | JP14 |
90MHz | 60MHz | 1.5x | 5 & 6 | Open | Open |
100MHz | 66MHz | 1.5x | Open | Open | Open |
Note: Pins designated should be in the closed position. |
CPU SPEED SELECTION (INTEL) | |||||
CPU speed | Clock speed | Multiplier | J5 | JP13 | JP14 |
75MHz | 50MHz | 1.5x | 3 & 4, 5 & 6 | Open | Open |
90MHz | 60MHz | 1.5x | 5 & 6 | Open | Open |
100MHz | 66MHz | 1.5x | Open | Open | Open |
120MHz | 60MHz | 2x | 5 & 6 | Closed | Open |
133MHz | 66MHz | 2x | Open | Closed | Open |
150MHz | 60MHz | 2.5x | 5 & 6 | Closed | Closed |
166MHz | 66MHz | 2.5x | Open | Closed | Closed |
200MHz | 66MHz | 3x | Open | Open | Closed |
Note: Pins designated should be in the closed position. |
CPU VOLTAGE SELECTION (SINGLE) | |||
Voltage | JP24 | JP25 | JP26 |
3.3v | Closed | Open | Open |
3.45v | Open | Closed | Open |
3.52v | Open | Open | Closed |
CPU VOLTAGE SELECTION (DUAL) | |||||||
Voltage | V core | J11 | J12 | J13 | JP24 | JP25 | JP26 |
3.3v | 2.5v | Closed | Open | Open | Closed | Open | Open |
3.3v | 2.8v | Open | Closed | Open | Open | Closed | Open |
3.3v | 3.45v | Open | Open | Closed | Open | Open | Closed |
3.45v | 2.5v | Closed | Open | Open | Closed | Open | Open |
3.45v | 2.8v | Open | Closed | Open | Open | Closed | Open |
3.45v | 3.45v | Open | Open | Closed | Open | Open | Closed |
3.52v | 2.5v | Closed | Open | Open | Closed | Open | Open |
3.52v | 2.8v | Open | Closed | Open | Open | Closed | Open |
3.52v | 3.45v | Open | Open | Closed | Open | Open | Closed |
MOS
CMOS SELECTION | |||
Setting | JP23 | JP35 | |
» | CMOS memory normal operation | Pins 2 & 3 closed | Open |
CMOS memory clear | Pins 3 & 4 closed | Closed |