SOYO COMPUTER CO., LTD. 486 VESA MAINBOARD Processor CX486S/80486SX/CX486S2/80487SX/CX486DX/80486DX/CX486DX2/ 80486DX2/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set ALI Max. Onboard128MB DRAM 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 Power LED & keylock J17 Turbo switch J21 Speaker J18 Turbo LED J22 Reset switch J19 32-bit VESA local SL1 & SL2 bus slots External battery J20 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select monochrome JP3 Open Monitor type select color JP3 Closed » CMOS memory normal operation JP5 pins 1 & 2 closed CMOS memory clear JP5 pins 2 & 3 closed » Factory configured - do not JP18 Open alter » Factory configured - do not JP19 Open alter » Battery type select internal JP20 pins 1 & 2 closed Battery type select external JP20 pins 2 & 3 closed » CPU type select PGA JP30 Closed CPU type select PQFP JP30 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 17MB (4) 256K x 9 (4) 4M x 9 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 68MB (4) 1M x 9 (4) 16M x 9 80MB (4) 4M x 9 (4) 16M x 9 128MB (4) 16M x 9 (4) 16M 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) 32K x 8 CACHE JUMPER CONFIGURATION Size JP16 JP22 JP23 64KB N/A N/A N/A 128KB N/A N/A N/A 256KB pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed Note: The jumper settings for 64KB & 128KB are unavailable from manufacturer. CPU TYPE CONFIGURATION Type JP1 JP6 JP7 JP8 JP9 JP10 CX486S 1 & 2 2 & 3 2 & 3 1 & 2 Open Open 80486SX 1 & 2 1 & 2 Open 1 & 2 Closed Closed CX486S2 1 & 2 2 & 3 2 & 3 1 & 2 Open Open 80487SX 1 & 2 1 & 2 Open 2 & 3 Closed Closed CX486DX 1 & 2 1 & 2 Open 2 & 3 Closed Closed CX486DX2 1 & 2 1 & 2 Open 2 & 3 Closed Closed 80486DX/DX2 1 & 2 1 & 2 Open 2 & 3 Closed Closed Pentium 2 & 3 2 & 3 1 & 2 2 & 3 Closed Closed Overdrive Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP11 JP12 JP13 JP14 JP17 JP31 CX486S 3 & 4 2 & 3 1 & 2 2 & 3 2 & 3 Open 80486SX Open 1 & 2 1 & 2 1 & 2 1 & 2 Open CX486S2 3 & 4 2 & 3 1 & 2 2 & 3 2 & 3 Closed 80487SX 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 Open CX486DX 2 & 3 1 & 2 1 & 2 2 & 3 1 & 2 Open CX486DX2 2 & 3 1 & 2 1 & 2 2 & 3 1 & 2 Closed 80486DX/DX2 2 & 3 1 & 2 1 & 2 1 & 2 1 & 2 Open Pentium 1 & 2 1 & 2 2 & 3 1 & 2 1 & 2 Open Overdrive Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP24 JP25 JP26 JP27 25MHz Open Open Closed Open 33MHz Closed Open Closed Closed 40MHz Open Closed Open Open 50iMHz Open Open Closed Open 50MHz Open Open Closed Open 66iMHz Closed Open Closed Closed CPU CLOCK SPEED CONFIGURATION Speed JP15 JP21 JP33 25MHz pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 33MHz pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 40MHz pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 50iMHz pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 50MHz pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 66iMHz pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed VESA WAIT STATE CONFIGURATION Wait states JP28 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP29 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed