BIOSTAR MICROTECH INTERNATIONAL CORPORATION MB-1425/33/40/50UCV-A Processor CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/ Pentium Overdrive Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set Biostar Max. Onboard DRAM64MB Cache 32/64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery JP8 Power LED & keylock JP15E 5V ground JP15A Speaker JP15F Turbo switch JP15B 32-bit VESA Local bus V1 slot Reset switch JP15C 32-bit VESA Local bus V2 slot Turbo LED JP15D 32-bit VESA Local bus V3 slot USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP8 pins 2 & 3 closed CMOS memory clear JP8 pins 3 & 4 closed » Power good signal detect from JP11 pins 1 & 2 power supply closed Power good signal detect from JP11 pins 2 & 3 board closed » One CPU (PQFP or PGA) on board JP12 pins 1 & 2 installed closed Two CPUs (enabled PGA and JP12 pins 2 & 3 disabled PQFP) on board installed closed » Monitor type select color JP14 pins 2 & 3 closed Monitor type select monochrome JP14 pins 1 & 2 closed » Add on card select normal JP28 pins 1 & 2 operation closed Add on card select Weitek 9000 JP28 pins 2 & 3 VGA card installed 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) 1M x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 (4) 4M x 9 17MB (4) 4M x 9 (4) 256K 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 Max Cachable Bank 0 Bank 1 TAG 32KB 8MB (4) 8K x 8 NONE (1) 8K x 8 64KB 16MB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB 32MB (4) 32K x 8 NONE (1) 8K x 8 256KB 64MB (4) 32K x 8 (4) 32K x 8 (1) 16K x 8 256KB 64MB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP5 JP6 JP7 JP9 JP10 32KB pins 2 & Open Open Open Open 3 64KB pins 1 & Open Open Closed Open 2 128KB pins 2 & pins 2 & Closed Closed Open 3 3 256KB pins 1 & pins 1 & Closed Closed pins 2 & 2 2 3 256KB pins 1 & pins 1 & Closed Closed pins 1 & 2 2 2 Note:Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type JP16 JP17 CX486S Open pins 2 & 3 closed 80486SX Open pins 2 & 3 closed 80487SX pins 2 & 3 closed pins 1 & 2 and 3 & 4 closed 80486DX pins 1 & 2 closed pins 1 & 2 and 3 & 4 closed ODP486SX pins 2 & 3 closed pins 1 & 2 and 3 & 4 closed 80486DX2 pins 1 & 2 closed pins 1 & 2 and 3 & 4 closed Pentium Overdrive pins 1 & 2 closed pins 1 & 2 and 3 & 4 closed CPU SPEED CONFIGURATION Speed JP21 JP22 JP23 JP27 25MHz Closed Open Closed Open 33MHz Closed Closed Open Open 40MHz Open Open Closed Closed 50i MHz Closed Open Closed Open 50MHz Open Closed Open Closed 66i MHz Closed Closed Open Open VESA BUS SPEED CONFIGURATION Mode JP19 JP20 JP25 JP26 JP29 JP30 (V2) (V1) (V3) (V2 & V3) Synchronous pins 1 pins 1 pins 1 pins 1 pins 1 pins 1 & 2 & 2 & 2 & 2 & 2 & 2 Asynchronous pins 2 pins 2 pins 2 pins 2 pins 2 pins 2 & 3 & 3 & 3 & 3 & 3 & 3 Note:Pins designated should be in the closed position. When V2 & V3 are used at the same time, JP25 must be left open.