J-MARK COMPUTER CORPORATION 486SX/DX VERSION II Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 16/20/25/33/50(internal)/50/66(internal) MHz Chip Set OPTI Max. onboard DRAM 32MB Cache 64/128/256KB BIOS AMI Dimensions 240mm x 220mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Speaker J17 Turbo switch JP9 Power LED & keylock J18 Turbo LED JP10 Reset switch SW1 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP1 pins 1 & 2 closed CMOS memory clear JP1 pins 2 & 3 closed » Monitor type select color JP2 Closed Monitor type select monochrome JP2 Open DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 5MB (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG (U39) TAG (U40) 64KB (4) 8K x 8 NONE (1) 8K x 8 NONE 128KB (4) 32K x 8 NONE (1) 8K x 8 NONE 256KB (4) 32K x 8 (4) 32K x 8 (1) 8K x 8 (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 NONE CACHE JUMPER CONFIGURATION Size JP5 JP6 JP7 JP8 JP15 JP16 64KB Open Open Open pins 2 Open Open & 3 128KB Closed Open Closed pins 1 Open Closed & 2 256KB Closed Closed Closed pins 2 closed closed & 3 Note:Pins designated should be in the closed postion. CPU TYPE CONFIGURATION CPU type JP17 JP18 JP19 JP20 80486SX PQFP Open Open Closed pins 2 & 3 closed 80486SX PGA Closed Open Closed pins 2 & 3 closed 80487SX Closed pins 2 & 3 Closed pins 1 & 2 closed closed 80486DX/DX2 Closed pins 1 & 2 Closed pins 1 & 2 closed closed CPU SPEED CONFIGURATION Speed JP11 JP12 JP13 JP14 16MHz Closed Closed Closed Closed 20MHz Open Closed Closed Open 25MHz Open Closed Open Closed 33MHz Open Open Closed Open 50i MHz Open Closed Open Closed 50MHz Open Open Closed Open 66i MHz Open Open Closed Open