UNIDENTIFIED 452S Processor 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set SIS Max. Onboard DRAM32MB Cache 64/128/256KB 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 Power LED & keylock J1 Reset switch J5 Speaker J2 External battery JP13 Turbo LED J3 32-bit VESA local bus SL1 - SL3 slots Turbo switch J4 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select monochrome JP12 Open Monitor type select color JP12 Closed » CMOS memory normal operation JP14 Open CMOS memory clear JP14 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M 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) 16K x 8 or (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP9 JP10 64KB Open Open 128KB Closed pins 1 & 2 closed 256KB Closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP1 JP2 JP3 80486SX Open pins 2 & 3 Open closed 80487SX Closed pins 1 & 2 pins 2 & 3 closed closed 80486DX/DX2 Closed pins 1 & 2 pins 1 & 2 closed closed Pentium Overdrive Closed pins 1 & 2 pins 2 & 3 closed closed CPU SPEED CONFIGURATION Type JS1 JS2 JS3 25MHz Open Open Closed 33MHz Closed Open Open 40MHz Closed Closed Open 50iMHz Open Open Closed 50MHz Open Closed Open 66iMHz Closed Open Open VESA WAIT STATE CONFIGURATION Wait states JP16 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP15 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed