BIOSTAR MICROTECH INTERNATIONAL CORPORATION MB-1425/33/40/50UCV-B/C/D/E Processor CX486S/80486SX/80487SX/80486DX/ODP486SX/80486DX2/80486DX4/ Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set Unidentified Max. 64MB Onboard DRAM Cache 32/64/128/256KB BIOS AMI Dimensions 254mm x 218mm I/O 32-bit VESA local bus slots (3), green PC connector Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Daughter board BC20 Turbo LED JP15 pins 10 - connector 11 External battery JP8 Reset switch JP15 pins 12 - 13 Green PC connector JP14 Turbo switch JP15 pins 14 - (Ver. D & E) 16 Speaker JP15 pins 1 - +5v ground JP15 pins 17 - 4 18 Power LED & keylock JP15 pins 5 - 32-bit VESA SL1 - SL3 9 local bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » Password normal operation JP3 Open Password memory clear JP3 Closed » CMOS memory normal operation JP8 pins 2 & 3 closed CMOS memory clear JP8 pins 3 & 4 closed Battery type select external JP8 Closed » Power good signal detect from JP11 pins 1 & 2 power supply closed Power good signal detect from JP11 pins 2 & 3 board closed » CPU type select PQFP or PGA JP12 pins 1 & 2 closed CPU type select PGA enabled & JP12 pins 2 & 3 PQFP disabled closed » Monitor type select color (Ver. JP14 pins 2 & 3 B & C only) closed Monitor type select monochrome JP14 pins 1 & 2 (Ver. B & C only) closed » VGA card select normal card JP28 pins 1 & 2 closed VGA card select Weitek Power JP28 pins 2 & 3 9000 VGA card only closed » Cyrix CPU type select CX486DX JP34 Open Cyrix CPU type select CX486DX2 JP34 Closed » Factory configured - do not JP36 Open alter » Mouse COM port select COM2 JP39 pins 1 & 2 closed Mouse COM port select COM1 JP39 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 1MB (4) 256K x 9 NONE NONE 2MB (4) 256K x 9 (1) 256K x 36 NONE 3MB (4) 256K x 9 (1) 256K x 36 (1) 256K x 36 4MB (4) 256K x 9 (1) 256K x 36 (1) 512K x 36 5MB (4) 256K x 9 (1) 1M x 36 NONE 6MB (4) 256K x 9 (1) 1M x 36 (1) 256K x 36 8MB (4) 1M x 9 (1) 1M x 36 NONE 10MB (4) 1M x 9 (1) 1M x 36 (1) 512K x 36 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB (4) 1M x 9 (1) 1M x 36 (1) 2M x 36 20MB (4) 4M x 9 (1) 1M x 36 NONE 24MB (4) 4M x 9 (1) 1M x 36 (1) 1M x 36 32MB (4) 4M x 9 (1) 4M x 36 NONE 36MB (4) 4M x 9 (1) 1M x 36 (1) 4M x 36 48MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 64MB (4) 16M x 9 NONE NONE Note: If this board uses 30-pin and 72-pin modules, use this table. 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 NONE 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 Note: If this board does not use 72-pin sockets, use this table. Depending on board revision, it will have either this setup or the above setup. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 32KB (4) 8K x 8 NONE (1) 8K x 8 64KB (4) 8K x 8 (4) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (A) (4) 32K x 8 (4) 32K x 8 (1) 16K x 8 256KB (B) (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP5 JP6 JP7 JP9 JP10 32KB 2 & 3 Open Open Open Open 64KB 1 & 2 Open Open Closed Open 128KB 2 & 3 2 & 3 Closed Closed Open 256KB (A) 1 & 2 1 & 2 Closed Closed 2 & 3 256KB (B) 1 & 2 1 & 2 Closed Closed 1 & 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 ODP486SX pins 2 & 3 closed pins 1 & 2, 3 & 4 closed 80487SX pins 2 & 3 closed pins 1 & 2, 3 & 4 closed 80486DX pins 1 & 2 closed pins 1 & 2, 3 & 4 closed 80486DX2 pins 1 & 2 closed pins 1 & 2, 3 & 4 closed 80486DX4 pins 1 & 2 closed pins 1 & 2, 3 & 4 closed Pentium Overdrive pins 1 & 2 closed pins 1 & 2, 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 50iMHz Closed Open Closed Open 50MHz Open Closed Open Closed 66iMHz Closed Closed Open Open 75iMHz Closed Open Closed Open 100iMHz Closed Closed Open Open CPU SPEED CONFIGURATION (80486DX4 ONLY) Speed JP41 2x pins 2 & 3 closed 3x pins 1 & 2 closed CPU VOLTAGE CONFIGURATION Voltage JP42 JP44 3.3v Open Open 5v pins 3 & 5, 4 & 6 pins 1 & 2, 3 & 4 closed closed VESA BUS CLOCK CONFIGURATION (SLOT 1) Setting JP26 Synchronous pins 1 & 2 closed Asynchronous pins 2 & 3 closed VESA BUS CLOCK CONFIGURATION (SLOT 2) Setting JP25 Synchronous pins 1 & 2 closed Asynchronous pins 2 & 3 closed VESA BUS CLOCK CONFIGURATION (SLOT 3) Setting JP29 Synchronous pins 1 & 2 closed Asynchronous pins 2 & 3 closed VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AB) CPU speed JP19 JP20 25MHz pins 2 & 3 closed pins 1 & 2 closed 33MHz pins 2 & 3 closed pins 1 & 2 closed 40MHz pins 1 & 2 closed pins 1 & 2 closed 50MHz pins 1 & 2 closed pins 1 & 2 closed VGA CARD CONFIGURATION (CIRRUS LOGIC VER. AC) CPU speed JP19 JP20 25MHz pins 2 & 3 closed pins 1 & 2 closed 33MHz pins 2 & 3 closed pins 1 & 2 closed 40MHz pins 1 & 2 closed pins 2 & 3 closed 50MHz pins 1 & 2 closed pins 2 & 3 closed