J-MARK COMPUTER CORPORATION
J-646B
| 
 Processor  | 
 Pentium  | 
| 
 Processor Speed  | 
 75/90/100/120/133/150/166MHz  | 
| 
 Chip Set  | 
 SIS  | 
| 
 Video Chip Set  | 
 None  | 
| 
 Maximum Onboard Memory  | 
 128MB (EDO supported)  | 
| 
 Maximum Video Memory  | 
 None  | 
| 
 Cache  | 
 256/512/1024KB  | 
| 
 BIOS  | 
 Award  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2)  | 
| 
 NPU Options  | 
 None  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Speaker  | 
 CN1  | 
 Serial port 2  | 
 J8  | 
| 
 Reset switch  | 
 CN2  | 
 Serial port 1  | 
 J9  | 
| 
 Turbo LED  | 
 CN3  | 
 Parallel port  | 
 J10  | 
| 
 Power LED & keylock  | 
 CN4  | 
 Floppy drive interface  | 
 J11  | 
| 
 Turbo switch  | 
 CN5  | 
 IDE interface 1  | 
 J12  | 
| 
 IDE interface LED  | 
 CN6  | 
 IDE interface 2  | 
 J13  | 
| 
 BK LED  | 
 CN7  | 
 External battery  | 
 J15  | 
| 
 PS/2 mouse interface  | 
 J2  | 
 32-bit PCI slots  | 
 PC1 – PC3  | 
| 
 VGA feature connector  | 
 J7  | ||
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Label  | 
 Position  | |
| 
 »  | 
 Factory configured - do not alter  | 
 J6  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP4  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP5  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP6  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP7  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP9  | 
 Open  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP15  | 
 Unidentified  | 
| 
 »  | 
 CPU write select write back  | 
 JP16  | 
 Pins 1 & 2 closed  | 
| 
 CPU write select write through  | 
 JP16  | 
 Pins 2 & 3 closed  | |
| 
 »  | 
 CPU pipeline enabled  | 
 JP17  | 
 Pins 2 & 3 closed  | 
| 
 CPU pipeline disabled  | 
 JP17  | 
 Pins 1 & 2 closed  | |
| 
 »  | 
 Suspend mode disabled  | 
 JP20  | 
 Open  | 
| 
 Suspend mode enabled  | 
 JP20  | 
 Closed  | |
| 
 »  | 
 Break switch for suspend mode  | 
 JP24  | 
 Pins 2 & 3 closed  | 
| 
 8042 RC enabled  | 
 JP24  | 
 Pins 1 & 2 closed  | |
| 
 »  | 
 Monitor type select monochrome  | 
 JP25  | 
 Open  | 
| 
 Monitor type select color  | 
 JP25  | 
 Closed  | |
| 
 »  | 
 Factory configured - do not alter  | 
 JP26  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP27  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP28  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP29  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP30  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP31  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP32  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP33  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP34  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP35  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP36  | 
 Unidentified  | 
| 
 »  | 
 Factory configured - do not alter  | 
 JP37  | 
 Unidentified  | 
| 
 USER CONFIGURABLE SETTINGS (CON’T)  | |||
| 
 Function  | 
 Label  | 
 Position  | |
| 
 »  | 
 CMOS memory normal operation  | 
 JP38  | 
 Pins 1 & 2 closed  | 
| 
 CMOS memory clear  | 
 JP38  | 
 Pins 2 & 3 closed  | |
| 
 »  | 
 PCICLK speed select 1/2 CPU CLK  | 
 JP39  | 
 Closed  | 
| 
 PCICLK speed select = 32MHz  | 
 JP39  | 
 Open  | |
| 
 »  | 
 PS/2 IRQ12 enabled  | 
 JP41  | 
 Closed  | 
| 
 PS/2 IRQ12 disabled  | 
 JP41  | 
 Open  | |
| 
 »  | 
 Factory configured - do not alter  | 
 JP42  | 
 Unidentified  | 
| 
 DRAM CONFIGURATION  | ||||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 Bank 2  | 
 Bank 3  | 
| 
 4MB  | 
 (1) 1M x 36  | 
 None  | 
 None  | 
 None  | 
| 
 8MB  | 
 (1) 2M x 36  | 
 None  | 
 None  | 
 None  | 
| 
 8MB  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
 None  | 
 None  | 
| 
 16MB  | 
 (1) 4M x 36  | 
 None  | 
 None  | 
 None  | 
| 
 16MB  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
 None  | 
 None  | 
| 
 16MB  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
| 
 24MB  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
| 
 32MB  | 
 (1) 8M x 36  | 
 None  | 
 None  | 
 None  | 
| 
 32MB  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 None  | 
 None  | 
| 
 32MB  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
| 
 40MB  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
| 
 48MB  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
| 
 64MB  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
| 
 72MB  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
 (1) 1M x 36  | 
 (1) 1M x 36  | 
| 
 80MB  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
 (1) 2M x 36  | 
 (1) 2M x 36  | 
| 
 96MB  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
 (1) 4M x 36  | 
 (1) 4M x 36  | 
| 
 128MB  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
 (1) 8M x 36  | 
| 
 Note: Board accepts EDO memory. Board also accepts x 32 SIMMs.  | ||||
| 
 DRAM VOLTAGE CONFIGURATION  | ||
| 
 Voltage  | 
 JP1  | |
| » | 
 Mixed mode  | 
 Pins 3 & 5, 4 & 6 closed  | 
| 
 3.3v  | 
 Pins 1 & 3, 2 & 4 closed  | |
| 
 CACHE CONFIGURATION  | |||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 TAG  | 
| 
 256KB (A)  | 
 None  | 
 (8) 32K x 8  | 
 (1) 8K x 8  | 
| 
 256KB (B)  | 
 (2) 32K x 32  | 
 None  | 
 Unidentified  | 
| 
 512KB (A)  | 
 None  | 
 (8) 64K x 8  | 
 (1) 16K x 8 (Windbond)  | 
| 
 512KB (B)  | 
 None  | 
 (8) 64K x 8  | 
 (1) 16K/32K x 8 (Aster)  | 
| 
 1MB  | 
 None  | 
 (8) 128K x 8  | 
 (1) 32K x 8  | 
| 
 Note: The location of bank 1 & TAG are unidentified.  | |||
| 
 CACHE JUMPER CONFIGURATION  | |||
| 
 Size  | 
 JP3  | 
 JP11  | 
 JP42  | 
| 
 256KB (A)  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Open  | 
| 
 256KB (B)  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
 Open  | 
| 
 512KB (A)  | 
 Pins 2 & 3 closed  | 
 Open  | 
 Closed  | 
| 
 512KB (B)  | 
 Pins 2 & 3 closed  | 
 Pins 1 & 2 closed  | 
 Open  | 
| 
 1MB  | 
 Pins 2 & 3 closed  | 
 Pins 2 & 3 closed  | 
 Open  | 
| 
 CPU SPEED SELECTION  | ||||||
| 
 CPU speed  | 
 Clock speed  | 
 Multiplier  | 
 JP12  | 
 JP13  | 
 JP18  | 
 JP19  | 
| 
 75MHz  | 
 50MHz  | 
 1.5x  | 
 Closed  | 
 Closed  | 
 Open  | 
 Open  | 
| 
 90MHz  | 
 60MHz  | 
 1.5x  | 
 Closed  | 
 Open  | 
 Open  | 
 Open  | 
| 
 100MHz  | 
 66MHz  | 
 1.5x  | 
 Open  | 
 Closed  | 
 Open  | 
 Open  | 
| 
 120MHz  | 
 60MHz  | 
 2x  | 
 Closed  | 
 Open  | 
 Open  | 
 Closed  | 
| 
 133MHz  | 
 66MHz  | 
 2x  | 
 Open  | 
 Closed  | 
 Open  | 
 Closed  | 
| 
 150MHz  | 
 60MHz  | 
 2.5x  | 
 Closed  | 
 Open  | 
 Closed  | 
 Closed  | 
| 
 166MHz  | 
 66MHz  | 
 2.5x  | 
 Open  | 
 Closed  | 
 Closed  | 
 Closed  | 
| 
 CPU VOLTAGE SELECTION  | ||||
| 
 Voltage  | 
 JP21  | 
 JP22  | 
 JP23  | |
| 
 3.3v  | 
 Closed  | 
 Open  | 
 Open  | |
| » | 
 3.45v  | 
 Open  | 
 Closed  | 
 Open  | 
| 
 3.6v  | 
 Open  | 
 Open  | 
 Closed  | |
| 
 VGA SELECTION  | ||||
| 
 Setting  | 
 JP2  | 
 JP8  | 
 JP10  | |
| » | 
 Onboard VGA  | 
 Pins 1 & 2 closed  | 
 Closed  | 
 Closed  | 
| 
 External VGA card  | 
 Pins 2 & 3 closed  | 
 Open  | 
 Open  | |