J-MARK COMPUTER CORPORATION
J-648AP
| 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 (CON’T) | ||
| 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 | V core | JP16 | JP17 | 
| 3.3v | 2.8v | Pins 1 & 2 closed | Pins 1 & 2 closed | 
| 3.3v | 3.45v | Pins 3 & 4 closed | Pins 1 & 2 closed | 
| 3.3v | 3.52v | Pins 5 & 6 closed | Pins 1 & 2 closed | 
| 3.45v | 2.8v | Pins 1 & 2 closed | Pins 3 & 4 closed | 
| 3.45v | 3.45v | Pins 3 & 4 closed | Pins 3 & 4 closed | 
| 3.45v | 3.52v | Pins 5 & 6 closed | Pins 3 & 4 closed | 
| 3.52v | 2.8v | Pins 1 & 2 closed | Pins 5 & 6 closed | 
| 3.52v | 3.45v | Pins 3 & 4 closed | Pins 5 & 6 closed | 
| 3.52v | 3.52v | Pins 5 & 6 closed | Pins 5 & 6 closed |