MICRO EXPRESS, INC. FOREX 486 VESA (Rev. VL 421A/422) Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal) Chip Set FOREX Max. Onboard DRAM 32MB SRAM Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA card slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery JP2 Turbo switch JP15 Reset switch JP3 Turbo LED JP16 Power LED & keylock JP9 32-bit VESA local S1 & S2 bus slots Speaker JP10 USER CONFIGURABLE SETTINGS Function Jumper Position » Battery select internal JP2 pins 1 & 2 closed Battery select external JP2 connected » Factory configured - do not alter JP5 closed » CMOS memory normal operation JP6 open CMOS memory clear JP6 closed VESA bus select zero wait states JP102 pins 1 & 2 £ 33MHz closed VESA bus select one wait state > JP102 pins 2 & 3 33MHz closed VESA bus speed select £ 33MHz JP103 pins 1 & 2 closed VESA bus speed select > 33MHz JP103 pins 2 & 3 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 CPU SPEED CONFIGURATION CPU speed JP7A JP7B JP7C 50MHz pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed 33MHz pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 25MHz pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed 20MHz pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed CPU TYPE CONFIGURATION CPU Type JP12 JP13 JP29 JP30 80486DX2 pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed ODP486SX pins 1 & 2 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed closed 80486DX pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed 80487SX pins 1 & 2 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed closed 80486SX pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed SRAM CONFIGURATION Size Cache Location TAG JP8A & D JP8B & E SRAM 64KB (8) 8K x Banks 0 & 1 (1) 8K x pins 2 & pins 2 & 8 8 3 3 128KB (4) 32K x Bank 0 (1) 8K x pins 1 & pins 1 & 8 8 2 2 256KB (8) 32K x Banks 0 & 1 (1) 32K pins 2 & pins 1 & 8 x 8 3 2 Note: Pins designated should be in the closed position.