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 |