SOYO COMPUTER CO., LTD. SY-025A2 Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 25/33/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM 32MB Cache 64/128/256KB BIOS AMI Dimensions 220mm x 254mm I/O Options 32-bit VESA local bus slots (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Keylock J17 Turbo switch J21 Speaker J18 Turbo LED J22 Reset J19 32-bit VESA local S1 & S2 bus slots (2) External battery J20 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color JP3 Closed Monitor type select monochrome JP3 Open » CMOS memory normal operation JP5 pins 1 & 2 closed CMOS memory clear JP5 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 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) 32K x 8 CACHE JUMPER CONFIGURATION Size JP6 JP7 64KB pins 1 & 2 closed open 128KB pins 2 & 3 closed pins 1 & 2 closed 256KB pins 2 & 3 closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP13 JP14 JP15 JP16 80486SX (PQFP) Open pins 2 & 3 Open Open closed 80486SX (PGA) Open pins 2 & 3 Open Closed closed 80487SX pins 2 & 3 pins 1 & 2 Closed Closed closed closed 80486DX pins 1 & 2 pins 1 & 2 Closed Closed closed closed 80486DX2 pins 1 & 2 pins 1 & 2 Closed Closed closed closed CPU SPEED CONFIGURATION Speed OSC at JP8 - JP11 JP20 JP21 JP22 Y1 25MHZ 25MHz pins 1 & 2 Closed Open Closed closed 33MHz 33MHz pins 1 & 2 Open Closed Closed closed 50iMHZ 25MHz pins 1 & 2 Closed Open Closed closed 50MHz 50MHz pins 2 & 3 Open Closed Open closed 66iMHz 33MHz pins 1 & 2 Open Closed Closed closed Notes:The board may come with a clock generator at Y1. JP8 controls VESA bus slot S1's speed, JP9 Controls VESA bus slot S1's wait states. JP10 controls VESA bus slot S2's speed, JP11 Controls VESA bus slot S2's wait states.