FOREX COMPUTER CORPORATION FOREX 486 (REV. VL3H) Processor 80486SX/80487SX/80486DX/80486DX2/P23T/P24T Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz Chip Set Forex Video Chip Set None Maximum Onboard Memory 32MB Maximum Video Memory None Cache 64/128/256KB BIOS AMI Dimensions 260mm x 220mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Turbo LED J6 External battery JP1 Speaker J7 Green PC connector JP14 Turbo switch J8 Green PC LED JP15 Power LED & keylock J9 32-bit VESA local bus SL1 – SL3 slots Reset switch J10 USER CONFIGURABLE SETTINGS Function Label Position PQFP CPU enabled JP5 Open PQFP CPU disabled JP5 Closed » CMOS memory normal operation JP6 Unidentified CMOS memory clear JP6 Unidentified Green PC disabled JP13 Open Green PC enabled JP13 Closed Green clock speed select 8MHz JP16 Pins 2 & 3 closed Green clock speed select 16MHz JP16 Pins 1 & 2 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 1 & 2 Pins 2 & 3 closed closed closed 128KB Pins 1 & 2 Pins 2 & 3 Pins 1 & 2 closed closed closed 256KB Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed CPU SPEED SELECTION Speed JP7A JP7B JP7C 20MHz Open Closed Closed 25MHz Closed Open Open 33MHz Open Open Open 40MHz Closed Closed Open 50iMHz Closed Open Open 50MHz Open Closed Open 66iMHz Open Open Open CPU TYPE SELECTION Type JP2 JP3 JP4 JP12 80486SX Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 closed closed closed closed 80487SX Pins 2 & 3 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed closed 80486DX Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 (PQFP) closed closed closed closed 80486DX Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 (PGA) closed closed closed closed 80486DX2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed closed P23T Pins 2 & 3 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed closed P24T Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed closed CPU TYPE SELECTION (CYRIX ONLY) Type JP20 CX486DX Open CX486DX2 Closed VL BUS WAIT STATE SELECTION Setting JP10 0 Pins 1 & 2 closed 1 Pins 2 & 3 closed VL BUS SPEED SELECTION Speed JP11 <= 33MHz Pins 1 & 2 closed >33 MHz Pins 2 & 3 closed