UNIDENTIFIED SIS 486 Processor CX486SX/80486SX/80487SX/CX486DX/80486DX/80486DX2 Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM64MB Cache 128/256KB BIOS AMI Dimensions 254mm x 220mm I/O Options 32-bit VESA local bus slots (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Auxiliary keyboard CN1 Turbo switch JP22 pins 15 - connector 17 External battery CN3 Reset switch JP22 pins 19 - 20 Power LED & keylock JP22 pins 1 - Bus mouse port JP22 pins 19 - 5 20 Speaker JP22 pins 6 - 32-bit VESA SL1 - SL3 10 local bus slots Turbo LED JP22 pins 12 - 13 USER CONFIGURABLE SETTINGS Function Jumper Position » Battery type select internal CN3 pins 2 & 3 closed Battery type select external CN3 Closed » Factory configured - do not alter JGPC N/A » Monitor type select monochrome JP1 Open Monitor type select color JP1 Closed » PQFP CPU disabled JP5 Closed PQFP CPU enabled JP5 Open » CPU speed select 50MHz (Cyrix JP6 pins 1 & 2 only) closed CPU speed select <50MHz (Cyrix JP6 pins 2 & 3 only) closed » CPU type select all JP16 pins 2 & 3 closed CPU type select 80486DX-40/50 JP16 pins 1 & 2 only closed » VESA card select normal JP23 Open VESA card select Genoa JP23 Closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 4MB (4) 256K x 9 (1) 256K x 36 (1) 512K x 36 4MB NONE (1) 512K x 36 (1) 512K x 36 8MB (4) 1M x 9 (1) 512K x 36 (1) 512K x 36 20MB (4) 4M x 9 (1) 512K x 36 (1) 512K x 36 4MB (4) 1M x 9 NONE NONE 8MB NONE (1) 1M x 36 (1) 1M x 36 8MB (4) 1M x 9 (1) 1M x 36 NONE 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB NONE (1) 4M x 36 NONE 16MB (4) 4M x 9 NONE NONE 32MB NONE (1) 4M x 36 (1) 4M x 36 64MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 DRAM CONFIGURATION Size JPA JPB JPC 4MB pins 1 & 2 pins 4 & 5 pins 1 & 2 closed closed closed 4MB pins 2 & 3 Open Open closed 8MB pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed 20MB pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed 4MB Open Open pins 2 & 3 closed 8MB pins 2 & 3 Open Open closed 8MB Open pins 4 & 5 pins 1 & 2 closed closed 12MB pins 1 & 2 pins 4 & 5 pins 1 & 2 closed closed closed 16MB Open Open Open 16MB Open Open pins 2 & 3 closed 32MB pins 2 & 3 Open Open closed 64MB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 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 JP2 JP3 JP4 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 256KB pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed CPU TYPE CONFIGURATION Type JP12 JP13 JP15 80486SX Open pins 2 & 3 Open closed 80487SX pins 2 & 3 pins 1 & 2 Closed closed closed 80486DX pins 1 & 2 pins 1 & 2 Closed closed closed 80486DX2 pins 1 & 2 pins 1 & 2 Closed closed closed CPU SPEED CONFIGURATION Speed JS0 JS1 JS2 25MHz Open Open Closed 33MHz Closed Open Open 40MHz Closed Closed Open 50iMHz Open Open Closed 50MHz Open Closed pins 1 & 2 closed 66iMHz Closed Open Open VESA WAIT STATE CONFIGURATION Wait states JP8 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP9 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed