UNIDENTIFIED SA-486 VL-BUS M.B. REV. V2C Processor CX486SX/80486SX/80487SX/AMD486DXLV/CX486DX/80486DX/80486DX2/ 80486DX4/Pentium Overdrive Processor 20/25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set ALI Max. 128MB Onboard DRAM Cache 128/256/512/1024KB BIOS Phoenix Dimensions 254mm x 220mm I/O Options 32-bit VESA local bus slots (3), green PC connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock CN1 Green PC connector JG7 Speaker CN2 Green PC connector JG8 Reset switch CN3 Green PC connector JG9 Turbo switch CN4 Green PC connector JG10 Turbo LED CN5 Green PC connector JG11 External battery CN6 32-bit VESA local bus SL1 - SL3 slots SMI connector JG6 USER CONFIGURABLE SETTINGS Function Jumper Position » Turbo switch enabled CN4 Closed Turbo switch disabled CN4 Open » Factory configured - do not JC12 Open alter » Factory configured - do not JC15 Open alter » Factory configured - do not JG16 Open alter » Factory configured - do not X2 Open alter DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 1MB (4) 256K x 9 NONE NONE 2MB NONE NONE (1) 512K x 36 2MB NONE (1) 512K x 36 NONE 4MB NONE (1) 1M x 36 NONE 4MB (4) 1M x 9 NONE NONE 4MB NONE NONE (1) 1M x 36 5MB (4) 256K x 9 (1) 1M x 36 NONE 8MB (4) 1M x 9 (1) 1M x 36 NONE 8MB NONE (1) 2M x 36 NONE 8MB NONE NONE (1) 2M x 36 16MB (4) 4M x 9 NONE NONE 16MB NONE (1) 4M x 36 NONE 16MB NONE NONE (1) 4M x 36 17MB (4) 256K x 9 (1) 4M x 36 NONE 20MB (4) 4M x 9 (1) 1M x 36 NONE 20MB (4) 1M x 9 (1) 4M x 36 NONE 20MB NONE (1) 1M x 36 (1) 4M x 36 20MB NONE (1) 4M x 36 (1) 1M x 36 32MB NONE (1) 8M x 36 NONE 32MB NONE NONE (1) 8M x 36 32MB (4) 4M x 9 (1) 4M x 36 NONE 64MB NONE (1) 16M x 36 NONE 64MB NONE NONE (1) 16M x 36 64MB (4) 16M x 9 NONE NONE 128MB NONE (1) 16M x 36 (1) 16M x 36 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 256KB (4) 64K x 8 NONE (1) 32K x 8 512KB (4) 64K x 8 (4) 64K x 8 (1) 32K x 8 512KB (4) 128K x 8 NONE (1) 64K x 8 1MB (4) 128K x 8 (4) 128K x 8 (1) 64K or 128K x 8 CACHE JUMPER CONFIGURATION Size JS1 JS2 JS3 JS4 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 3 closed closed closed closed 256KB pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 2 & 4 closed closed closed closed 256KB pins 2 & 3 pins 1 & 2 pins 1 & 2 pins 1 & 3 closed closed closed closed 512KB pins 2 & 3 pins 2 & 3 pins 1 & 2 pins 3 & 5 closed closed closed closed 512KB pins 2 & 3 pins 2 & 3 pins 1 & 2 pins 1 & 3 closed closed closed closed 1MB pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 4 & 6 closed closed closed closed CPU TYPE CONFIGURATION Type JC1 JC2 JC3 JC4 JC5 JC6 JC20 CX486SX Open 2 & 1 & 1 & 2 & 3 Open Open 3 2 2 80486SX Open 2 & 1 & 1 & Open Closed Closed 3 2 2 80487SX 1 & 2 1 & 1 & 1 & Open Closed Open 2, 3 2 2 & 4 CX486DX 2 & 3 1 & 1 & 1 & 2 & 3 Closed Open 2, 3 2 2 & 4 AMD486DX 2 & 3 1 & 1 & 1 & Open Closed Open 2, 3 2 2 & 4 80486DX/DX2 2 & 3 1 & 1 & 1 & Open Closed Closed 2, 3 2 2 & 4 80486DX4 2 & 3 1 & 1 & 1 & Open Closed Closed 2, 3 2 2 & 4 P4S/P24S 2 & 3 1 & 1 & 1 & Open Closed Closed 2, 3 2 2 & 4 P23S Open 2 & 1 & 1 & Open Closed Open 3 2 2 P24T 1 & 2 1 & 2 & 2 & 1 & 2 Closed Closed 2, 3 3 3 & 4 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JC22 JG2 JG3 JG4 JG5 JG19 JG20 CX486SX Closed 1 & 1 & 1 & 1 & 2 Closed 1 & 2 2 2 2 80486SX Open 1 & 1 & 1 & 1 & 2 Open Open 2 2 2 80487SX Open 1 & 1 & 1 & 1 & 2 Open 2 & 3 2 2 2 CX486DX Closed 1 & 1 & 1 & 1 & 2 Closed 1 & 2 2 2 2 AMD486DX Open 2 & 2 & 2 & 2 & 3 Open Open 3 3 3 80486DX/DX2 Open 1 & 1 & 1 & 1 & 2 Open Open 2 2 2 80486DX4 Open 2 & 2 & 2 & Open Open 2 & 3 3 3 3 P4S/P24S Open 2 & 2 & 2 & 2 & 3 Open 2 & 3 3 3 3 P23S Open 2 & 2 & 2 & 2 & 3 Open 2 & 3 3 3 3 P24T Open 2 & 2 & 2 & 2 & 3 Open Open 3 3 3 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JC7 JC8 JC9 CX486SX pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed CX486DX pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 80486DX/DX2/DX4 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed Pentium Overdrive pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed CPU SPEED CONFIGURATION Speed JF1 JF2 JF3 JG13 20MHz pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed closed 25MHz pins 2 & 3 pins 1 & 2 pins 2 & 3 Open closed closed closed 33MHz pins 2 & 3 pins 2 & 3 pins 1 & 2 Open closed closed closed 40MHz pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed closed 50iMHz pins 2 & 3 pins 1 & 2 pins 2 & 3 Open closed closed closed 50MHz pins 2 & 3 pins 1 & 2 pins 2 & 3 Open closed closed closed 66iMHz pins 2 & 3 pins 2 & 3 pins 1 & 2 Open closed closed closed CPU SPEED CONFIGURATION (CON’T) Speed JG14 JG15 JC10 JC11 JC13 20MHz Open Open 1 & 2 1 & 2 1 & 2 25MHz 1 & 2 Open 1 & 2 1 & 2 1 & 2 33MHz Open 1 & 2 1 & 2 1 & 2 1 & 2 40MHz Open Open 2 & 3 2 & 3 2 & 3 50iMHz 1 & 2 Open 1 & 2 1 & 2 1 & 2 50MHz 1 & 2 Open 2 & 3 2 & 3 2 & 3 66iMHz Open 1 & 2 1 & 2 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION (DX4) Speed JX3 JX4 2x pins 2 & 3 closed Open 2.5x Open Closed 3x pins 1 & 2 closed Open CPU VOLTAGE CONFIGURATION Voltage JX1 JX2 3.3v pins 2 & 3 closed Open 3.45v pins 1 & 2 closed Open 5v Open pins 1 & 2, 3 & 4 closed BUS SPEED CONFIGURATION CPU speed J1 <=33MHz Open >33MHz Closed VESA WAIT STATE CONFIGURATION Wait states J2 0 wait states Open 1 wait state Closed