CHAINTECH COMPUTER COMPANY, LTD. VESA MAINBOARD SIS 486 (REV. 2) Processor 80486SX/CX486M7/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM128MB Cache 128/256/512KB BIOS AMI/Award Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Reset switch J6 Turbo switch J3 Power LED & keylock J7 Turbo LED J4 Green PC connector JP26 Speaker J5 32-bit VESA local bus SL1 - SL3 slots USER CONFIGURABLE SETTINGS Function Jumper Position » SMOUT type select normal mode J2 Closed SMOUT type select standby mode J2 Open » CMOS memory normal operation JP16 pins 1 & 2 closed CMOS memory clear JP16 pins 2 & 3 closed » Factory configured - do not JP18 Open alter 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 65MB (4) 256K x 9 (4) 16M x 9 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 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 512KB (4) 128K x 8 NONE (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP1 JP2 JP3 JP4 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2, 3 pins 1 & 2 closed closed & 4 closed closed 256KB pins 2 & 3 pins 2 & 3 pins 2 & 3, 4 pins 1 & 2 closed closed & 5 closed closed 512KB pins 1 & 2 pins 2 & 3 pins 1 & 2, 3 pins 2 & 3 closed closed & 4 closed closed CPU TYPE CONFIGURATION Type JP8 JP9 JP10 JP11 JP12 JP13 JP14 80486SX 2 & Open 2 & 3 Open 3 & 4 1 & 2 2 & 3 3 CX486M7 1 & Closed 2 & 3 2 & 3 2 & 3 Open 1 & 2 2 80486DX/DX2 1 & Closed 2 & 3 2 & 3 3 & 4 1 & 2 2 & 3 2 P23S 2 & Open 2 & 3 Open 3 & 4 1 & 2 2 & 3 3 P24D 1 & Closed 1 & 2 2 & 3 1 & 2 2 & 3 2 & 3 2 P24S 1 & Closed 2 & 3 2 & 3 3 & 4 1 & 2 2 & 3 2 P24T 1 & Closed 1 & 2 1 & 2 3 & 4 Open 1 & 2 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP15 JP21 JP22 JP24 JP25 JP30 80486SX 4 & 5 2 & 3 1 & 2 Open Open Open CX486M7 2 & 3 1 & 2 2 & 3 2 & 3 2 & 3 Open 80486DX/DX2 4 & 5 2 & 3 1 & 2 Open Open Open P23S 4 & 5 2 & 3 1 & 2 Open Open Open P24D 4 & 5 2 & 3 1 & 2 Open 1 & 2 Closed P24S 4 & 5 2 & 3 1 & 2 Open Open Open P24T 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 Open Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP5 JP6 JP7 25MHz Open Closed Open 33MHz Closed Closed Closed 40MHz Open Closed Closed 50iMHz Open Closed Open 50MHz Closed Open Open 66iMHz Closed Closed Closed CPU CLOCK DELAY CONFIGURATION Delay JP20 0 delay pins 1 & 2 closed 1 gate buffer delay pins 2 & 3 closed CPU INPUT FREQUENCY CONFIGURATION input JP23 Single input pins 1 & 2 closed Double input pins 2 & 3 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