SOYO COMPUTER CO., LTD. SY-020H Processor 80486SX/80487SX/80486DX Processor Speed 16/20/25/33/40/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM 32MB Cache 32/64/128/256KB BIOS AMI Dimensions 245mm x 220mm I/O Options None NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J17 External battery J20 Speaker J18 Turbo switch J21 Reset switch J19 Turbo LED J22 Note:The oscillator at OSC1 must match the external speed of the CPU installed. 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 » Power good signal detect from JP7 pins 1 & 2 board closed Power good signal detect from JP7 pins 2 & 3 power supply closed » Keyboard BIOS clock source select JP18 pins 1 & 2 programmable timer closed Keyboard BIOS clock source select JP18 pins 2 & 3 7MHz closed » CPU speed select ³ to 25MHz JP19 pins 1 & 2 closed CPU speed select < 25MHz JP19 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 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 32KB (4) 8K x 8 NONE (2) 4K x 4 64KB (4) 8K x 8 (4) 8K x 8 (2) 4K x 4 128KB (4) 32K x 8 NONE (2) 16K x 4 256KB (4) 32K x 8 (4) 32K x 8 (2) 16K x 4 CACHE JUMPER CONFIGURATION Size JP8 JP9 JP10 JP11 JP12 JP13 JP14 JP15 JP16 32KB 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 2 2 2 2 2 2 2 2 2 64KB 2 & 1 & 1 & 2 & 1 & 1 & 2 & 2 & 1 & 2 3 2 2 3 2 2 3 3 128KB 2 & 2 & 1 & 2 & 2 & 1 & 1 & 1 & 2 & 3 3 3 2 3 3 2 2 2 256KB 2 & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 3 3 3 3 3 3 3 3 3 Note: Pins designated should be in the closed position. CPU CONFIGURATION Type JP24 JP25 JP26 80486SX pins 2 & 3 Open Open closed 80487SX pins 1 & 2 Closed pins 2 & 3 closed closed 80486DX pins 1 & 2 Closed pins 1 & 2 closed closed