J-MARK COMPUTER CORPORATION J-656B Processor Pentium Processor Speed 75/90/100/120/133/150/180/200MHz Chip Set Intel Video Chip Set None Maximum Onboard 128MB (EDO supported) Memory Maximum Video Memory None Cache 256/512KB BIOS Award Dimensions 330mm x 218mm I/O Options 32-bit PCI slots (4), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VRM connector. IR connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Serial port 2 CN1 Speaker J4 Serial port 1 CN2 Power LED & keylock J5 Parallel port CN3 Turbo LED J6 Floppy drive interface CN4 Turbo switch J7 IDE interface 2 CN5 IR connector JP8 IDE interface 1 CN6 PS/2 mouse interface MS1 Reset switch J2 32-bit PCI slots PC1 – PC4 IDE interface LED J3 VRM connector VRM USER CONFIGURABLE SETTINGS Function Label Position » Factory configured - do not J8 Unidentified alter » Factory configured - do not J9 Unidentified alter » PCI CLK select CLK/4 JP3 Pins 2 & 3 closed PCI CLK select CLK/3 JP3 Pins 1 & 2 closed » I/O address select 250 HEX JP4 Pins 2 & 3 closed I/O address select 3F0 HEX JP4 Pins 1 & 2 closed » IDE interface 1 IRQ select JP5 Pins 1 & 2 closed IRQ14 IDE interface 1 IRQ select JP5 Pins 2 & 3 closed MIRQ1 » IDE interface 2 IRQ select JP6 Pins 1 & 2 closed IRQ15 IDE interface 2 IRQ select JP6 Pins 2 & 3 closed MIRQ0 » Factory configured - do not JP9 Unidentified alter » Green PC disabled JP10 Open Green PC enabled JP10 Closed » Factory configured - do not JP13 Unidentified alter » Factory configured - do not JP15 Unidentified alter » Factory configured - do not JP16 Unidentified alter » CMOS memory normal operation JP17 Open CMOS memory clear JP17 Closed » CPU type select write back JP18 Open CPU type select write through JP18 Closed » CPU pipeline enabled JP19 Closed CPU pipeline disabled JP19 Open » Factory configured - do not JP20 Unidentified alter » Factory configured - do not JP24 Unidentified alter » Factory configured - do not JP32 Unidentified alter 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 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 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. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 256KB (A) (2) 32K x 32 None (1) 8K x 8 256KB (B) None (8) 32K x 8 (1) 8K x 8 512KB (A) (2) 64K x 32 None (1) 16K/32K x 8 512KB (B) None (8) 64K x 8 (1) 16K/32K x 8 CACHE JUMPER CONFIGURATION Size JP14 256KB (A) Pins 1 & 2 closed 256KB (B) Pins 1 & 2 closed 512KB (A) Pins 2 & 3 closed 512KB (B) Pins 2 & 3 closed CACHE VOLTAGE CONFIGURATION Voltage JP1 JP2 3v synchronous Open Pins 1 & 2, 3 & 4, 5 & 6 closed 3v asynchronous Open Pins 1 & 2, 3 & 4, 5 & 6 closed 5v mixed asynchronous Pins 1 & 2, 3 & 4, Open 5 & 6 closed CPU SPEED SELECTION CPU Clock Multiplier JP11 JP12 JP26 JP27 speed speed 75MHz 50MHz 1.5x Open Open Open Open 90MHz 60MHz 1.5x Open Closed Open Open 100MHz 66MHz 1.5x Closed Closed Open Open 120MHz 60MHz 2x Open Closed Open Closed 133MHz 66MHz 2x Closed Closed Open Closed 150MHz 60MHz 2.5x Open Closed Closed Closed 180MHz 60MHz 3x Open Closed Closed Open 200MHz 66MHz 3x Closed Closed Closed Open CPU VOLTAGE SELECTION Voltage JP28 JP29 JP30 3.3v Closed Open Open 3.45v Open Closed Open 3.6v Open Open Closed BIOS SELECTION Setting JP21 JP31 EPROM Pins 1 & 2 closed Pins 2 & 3 closed » 12v flash Pins 2 & 3 closed Pins 1 & 2 closed 5v flash Pins 2 & 3 closed Pins 2 & 3 closed