BIOSTAR MICROTECH INTERNATIONAL CORPORATION MB-1420/1425/1433V Processor 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 20/25/33/50(internal)/50/66(internal)MHz Chip Set VLSI Max. Onboard DRAM32MB Cache None BIOS Award Dimensions 230mm x 218mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Speaker J1 Turbo switch J5 Power LED & keylock J2 5v DC ground J6 Turbo LED J3 External battery CN2 Reset switch J4 USER CONFIGURABLE SETTINGS Function Jumper Position » Keyboard type select BTC keyboard JP1 Closed Normal operation JP1 Open » AT bus clock mode select JP2 pins 1 & 2 asynchronous closed AT bus clock mode select JP2 pins 2 & 3 synchronous closed » Monitor type select monochrome JP3 Open Monitor type select color JP3 Closed » 8042 turbo control pin select pin JP4 pins 1 & 2 30 closed closed 8042 turbo control pin select pin JP4 pins 2 & 3 23 closed closed » CMOS memory normal operation JP5 pins 1 & 2 closed CMOS memory clear JP5 pins 3 & 4 closed » On board keyboard fuse enabled JP9 Open On board keyboard fuse disabled JP9 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 32MB (4) 4M x 9 (4) 4M x 9 CPU TYPE CONFIGURATION (PQFP CPU INSTALLED) Type JP7 JP8 JP14 JP15 80486SX (PQFP) & 1 & 2 2 & 3 1 & 2 1 & 2 upgrade to DX/DX2 80486SX (PQFP) & open 1 & 2 2 & 3 2 & 3 upgrade to Overdrive Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (PGA ONLY CPU INSTALLED) Type JP7 JP8 JP14 JP15 80487SX pins 1 & 2 pins 2 & 3 pins 2 & 3 Open closed closed closed 80486DX/DX2 pins 1 & 2 pins 2 & 3 pins 1 & 2 Open closed closed closed Note: The PQFP CPU is optional and may not be present. If there is no PQFP, use the above settings.