POSITIVE CORPORATION PERSONAL COMPUTER SYTEMS SYSTEM BOARD Processor 80386SX/80486SX/80487SX (depends on CPU board installed) Processor Speed 20/33MHz Chip Set Unidentified Max. Onboard DRAM 32MB Cache 32/128KB (depends on CPU board installed) BIOS Unidentified Dimensions 254mm x 218mm I/O Options Parallel port, serial ports (2), VGA port, VGA feature connector, floppy drive interface, IDE interface, riser slot, CPU slot NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location VGA port J2 External battery J17 Serial port 1 J3 Turbo LED J25 Serial port 2 J4 IDE interface LED J26 Parallel port J5 Auxiliary speaker J27 VGA feature connector J7 Reset switch S1 Floppy drive interface J11 Riser Card SL1 IDE interface J12 CPU slot SL2 Speaker J16 USER CONFIGURABLE SETTINGS Function Jumper Position » 256KB - 640KB memory enabled J6 pins 1 & 2 closed 256KB - 640KB memory disabled J6 pins 1 & 2 open » 512KB - 640KB memory enabled J6 pins 3 & 4 closed 512KB - 640KB memory disabled J6 pins 3 & 4 open » Security disabled J6 pins 5 & 6 closed Security enabled J6 pins 5 & 6 open » VGA mode select PS/2 J10 pins 5 & 6 closed VGA mode select AT J10 pins 5 & 6 open » Monitor timing select any J10 pins 7 & 8 open monitor timing Monitor timing select Multi Sync J10 pins 7 & 8 1 timing closed » Factory configured - do not J13 N/A alter » Factory configured - do not J28 N/A alter DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 512KB (2) 256K x 9 NONE NONE NONE 1MB (2) 256K x 9 (2) 256K x 9 NONE NONE 1.5MB (2) 256K x 9 (2) 256K x 9 (2) 256K x 9 NONE 2MB (2) 256K x 9 (2) 256K x 9 (2) 256K x 9 (2) 256K x 9 2MB (2) 1M x 9 NONE NONE NONE 2.5MB (2) 1M x 9 (2) 256K x 9 NONE NONE 3MB (2) 256K x 9 (2) 256K x 9 (2) 1M x 9 NONE 3.5MB (2) 256K x 9 (2) 256K x 9 (2) 1M x 9 (2) 256K x 9 4MB (2) 1M x 9 (2) 1M x 9 NONE NONE 4.5MB (2) 1M x 9 (2) 1M x 9 (2) 256K x 9 NONE 5MB (2) 1M x 9 (2) 1M x 9 (2) 256K x 9 (2) 256K x 9 6MB (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 NONE 6.5MB (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 (2) 256K x 9 8MB (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 8MB (2) 4M x 9 NONE NONE NONE 8.5MB (2) 4M x 9 (2) 256K x 9 NONE NONE 9MB (2) 256K x 9 (2) 256K x 9 (2) 4M x 9 NONE 10MB (2) 4M x 9 (2) 1M x 9 NONE NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 12MB (2) 4M x 9 (2) 1M x 9 (2) 1M x 9 NONE 14MB (2) 1M x 9 (2) 1M x 9 (2) 4M x 9 (2) 1M x 9 16MB (2) 4M x 9 (2) 4M x 9 NONE NONE 16.5MB (2) 4M x 9 (2) 4M x 9 (2) 256K x 9 NONE 17MB (2) 4M x 9 (2) 4M x 9 (2) 256K x 9 (2) 256K x 9 18MB (2) 4M x 9 (2) 4M x 9 (2) 1M x 9 NONE 20MB (2) 4M x 9 (2) 4M x 9 (2) 1M x 9 (2) 1M x 9 24MB (2) 4M x 9 (2) 4M x 9 (2) 4M x 9 NONE 32MB (2) 4M x 9 (2) 4M x 9 (2) 4M x 9 (2) 4M x 9 VRAM CONFIGURATION Size Bank 0 Bank 1 512KB 512KB NONE 1MB 512KB 512KB [Image] CACHE CONFIGURATION Size Bank 0 Bank 1 32KB (2) 8K x 8 (2) 8K x 8 128KB (2) 32K x 8 (2) 32K x 8 CACHE JUMPER CONFIGURATION Size JP1 32KB pins 1 & 2 closed 128KB pins 3 & 4 closed [Image] USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP1 N/A alter [Image] CPU TYPE CONFIGURATION Type JP1 JP2 80486SX-20 Open Closed 80486SX-33 Closed Open 80487SX-20 Closed Open