FOREX COMPUTER CORPORATION FOREX 486 REV. VL2 Processor 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz Chip Set Forex Max. Onboard DRAM32MB Cache 64/128/256KB BIOS AMI Dimensions 254mm x 220mm I/O Options 32-bit VESA local bus slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Turbo LED J5 Reset switch J9 Speaker J6 External battery JP1 Turbo switch J7 32-bit local bus SL1 & SL2 slots Power LED & keylock J8 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP6 Open CMOS memory clear JP6 Closed » Factory configured - do not JP9 Open alter » CPU type select 80486 JP12 pins 1 & 2 closed CPU type select Pentium JP12 pins 2 & 3 Overdrive closed 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 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 16K/32K x 8 CACHE JUMPER CONFIGURATION Size JP8A JP8B JP8C 64KB pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 256KB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed CPU TYPE CONFIGURATION Type JP2 JP3 JP4 JP5 80486SX pins 2 & 3 Open Open pins 2 & 3 closed closed 80486SX/DX PQFP pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed 80487SX pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed closed 80486DX/DX2 pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed Pentium pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 2 & 3 Overdrive closed closed closed closed CPU SPEED CONFIGURATION Speed JP7A JP7B JP7C 20MHz pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed 25MHz pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed 33MHz pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 40MHz pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed 50iMHz pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed 50MHz pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed 66iMHz pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed VESA WAIT STATE CONFIGURATION Wait states JP10 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP11 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed