UNIDENTIFIED OPTI495SLC VL-BUS 3/486 Processor 80386DX/CX486DLC/80486SX/80487DX/80486DX/80486DX2 Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set OPTI Max. Onboard DRAM64MB Cache 64/128/256KB BIOS AMI Dimensions 230mm x 218mm I/O Options 32-bit VESA local bus slots (2) NPU Options 80387DX [Image] CONNECTIONS Purpose Location Purpose Location Turbo switch J1 Reset switch J5 Power LED & keylock J2 External battery J6 Speaker J3 32-bit VESA Local bus SL1 & SL2 slots Turbo LED J4 USER CONFIGURABLE SETTINGS Function Jumper Position » Turbo mode enabled J1 Open Turbo mode disabled J1 Closed » CMOS memory normal operation J6 pins 2 & 3 (Internal Battery) closed CMOS memory clear J6 pins 3 & 4 closed » Factory configured - do not alter JP7 N/A » Factory configured - do not alter JP9 N/A » Cyrix PQFP disabled JP10 Closed Cyrix PQFP enabled JP10 Open » 80386DX/80486SX PQFP disabled JP16 Closed 80386DX/80486SX PQFP enabled JP16 Open » Monitor type select monochrome JP21 Open Monitor type select color JP21 Closed » Battery type select NI-CD recharge JP29 pins 2 & 3 closed Battery type select Lithum JP29 pins 1 & 2 discharge 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 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 20MB (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 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 JP13 JP17 JP18 JP20 JP24 JP27 JP28 64KB Open Open 2 & 3 1 & 2 Open Open Open 128KB Open Closed 1 & 2 2 & 3 Open Open Open 256KB Closed Closed 2 & 3 1 & 2 Open Open Open Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION CPU Type JP12 JP14 JP15 80386 pins 1 & 2 pins 1 & 2 Open closed closed 80486 pins 2 & 3 pins 2 & 3 Closed closed closed CPU TYPE CONFIGURATION (80486) Type JP5 JP6 JP19 80486SX Open Open pins 2 & 3 closed 80487SX pins 2 & 3 Closed pins 1 & 2 closed closed 80486DX/DX2 pins 1 & 2 Closed pins 1 & 2 closed closed Overdrive pins 2 & 3 Closed pins 1 & 2 closed closed CPU SPEED CONFIGURATION (80386DX & CX486DLC) Speed JP1 JP2 JP3 JP4 JP22 33MHz Closed Open Closed 2 & 3 Open 40MHz Closed Closed Closed 2 & 3 Open Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION (80486) Speed JP1 JP2 JP3 JP4 JP22 25MHz Open Open Open 1 & 2 Closed 33MHz Open Closed Open 1 & 2 Open 40MHz Closed Closed Open 1 & 2 Open 50iMHz Open Open Open 1 & 2 Closed 50MHz Closed Open Open 1 & 2 Open 66iMHz Open Closed Open 1 & 2 Open Note: Pins designated should be in the closed position. VESA CARD CONFIGURATION Card Type JP23 Use standard VESA card with (all CPU’s) pins 1 & 2 closed Use DC-680DT VGA, Tekram VESA cache IDE or other pins 2 & 3 closed special card (486DX-50 only)