DATAEXPERT CORPORATION OPTI-495SX Device Type Mainboard Processor 80386DX/80486SX/80487SX/80486DX/80486DX2/ODP486 Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set OPTI495SX Maximum Onboard Memory 32MB Cache 64/128/256KB BIOS AMI Dimensions 254mm x 218mm I/O Options 32-bit VESA local bus slot NPU Options 80387DX [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J1 Reset switch J5 Speaker J2 External battery JP18 Turbo switch J3 32-bit VESA local bus SL1 slot Turbo LED J4 USER CONFIGURABLE SETTINGS Function Label Position » Factory configured - do not JP8 Unidentified alter » Factory configured - do not JP9 Unidentified alter » Factory configured - do not JP10 Unidentified alter » Factory configured - do not JP11 Unidentified alter Monitor type select color JP17 Closed Monitor type select monochrome JP17 Open » CMOS memory normal operation JP18 Pins 2 & 3 closed CMOS memory clear JP18 Pins 3 & 4 closed Battery type select external JP18 Closed » Factory configured - do not JP23 Unidentified alter » Factory configured - do not JP29 Unidentified alter SIMM 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 5MB (4) 1M x 9 (4) 256K 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 17MB (4) 4M x 9 (4) 256K 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 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 JP6 JP7 JP12 JP13 64KB Open Open Open Pins 2 & 3 closed 128KB Open Closed Closed Pins 1 & 2 closed 256KB Closed Closed Closed Pins 2 & 3 closed CPU SPEED SELECTION Speed JP14 JP15 JP16 JP22 25MHz Pins 1 & 2 Open Closed N/A closed 33MHz (386) Pins 2 & 3 Closed Open Closed closed 33MHz Pins 1 & 2 Closed Open N/A closed 40MHz (386) Pins 2 & 3 Open Open Open closed 50iMHz Pins 1 & 2 Open Closed N/A closed 50MHz Pins 2 & 3 Open Closed N/A closed 66iMHz Pins 1 & 2 Closed Open N/A closed CPU TYPE SELECTION Type JP1 JP2 JP4 80486SX Open Pins 2 & 3 Open closed 80487SX Closed Pins 1 & 2 Pins 2 & 3 closed closed 80486DX Closed Pins 1 & 2 Pins 1 & 2 closed closed 80486DX2 Closed Pins 1 & 2 Pins 1 & 2 closed closed ODP486 Closed Pins 1 & 2 Pins 2 & 3 closed closed CPU TYPE SELECTION Type JP3 JP5 JP21 JP24 80386 (PQFP) Pins 2 & 3 Pins 1 & 2 Open Pins 1 & 2 closed closed closed 80486 (PGA) Pins 1 & 2 Pins 2 & 3 Closed Pins 2 & 3 closed closed closed 80486 Pins 1 & 2 Pins 2 & 3 Open Pins 2 & 3 (PQFPGA) closed closed closed