MICRONICS COMPUTERS, INC. ZIF SOCKET SYSTEM BOARD Processor 80486SX/80486DX/80486DX2/Pentium Overdrive Processor Speed 25/33/50(internal)66/(internal)MHz Chip Set Intel Max. Onboard DRAM 64MB Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, serial ports (2) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Floppy drive CN1 Speaker J33 interface IDE interface CN2 Power LED & keylock J34 External battery J8 IDE interface LED W11 External keyboard J10 Reset switch W12 connector Serial port 1 J12 Turbo LED W13 Parallel port J15 Turbo switch W14 Serial port 2 J16 32-bit VESA Local bus SL1 & SL2 slots USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not SW1/2 On alter » Factory configured - do not SW1/3 Off alter » Factory configured - do not SW1/4 Off alter » Clock type select Motorola W1 Open 126818 Clock type select Dallas W1 Closed » Parallel port unidirectional W5 pins 1 & 2 (printer) closed Parallel port bidirectional W5 pins 2 & 3 closed » Monitor type select color W6 Closed Monitor type select monochrome W6 Open » Factory configured - do not W7 Open alter » CMOS memory normal operation W8 pins 2 & 3 closed CMOS memory clear W8 pins 1 & 2 closed » Factory configured - do not W20 Closed alter » Factory configured - do not W28 Closed alter » Battery normal operation W31 Open (Dallas) Battery memory clear (Dallas) W31 Closed » Local bus parity enabled W40 Closed Local bus disabled W40 Open » Factory configured - do not W61 Open alter » Factory configured - do not W62 Open alter » CPU type select W70 pins 2 & 3 80486DX/DX2/Pentium Overdrive closed CPU type select 80486SX W70 pins 1 & 2 closed » CPU type select PQFP installed W71 pins 1 & 2 with PGA Pentium Overdrive closed CPU type select PQFP installed W71 pins 2 & 3 with PGA 80486DX/DX2 closed Note: The location of jumpers W20, W28, W61 & W62 are unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 256K x (1) 256K x NONE NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 4MB (1) 1M x 36 NONE NONE NONE 5MB (1) 256K x (1) 1M x 36 NONE NONE 36 6MB (1) 256K x (1) 256K x (1) 1M x 36 NONE 36 36 7MB (1) 256K x (1) 256K x (1) 256K x (1) 1M x 36 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 9MB (1) 256K x (1) 1M x 36 (1) 1M x 36 NONE 36 10MB (1) 256K x (1) 256K x (1) 1M x 36 (1) 1M x 36 36 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 13MB (1) 256K x (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 36 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE NONE NONE 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 NONE 28MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 NONE 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 52MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 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) 32K x 8 CACHE JUMPER CONFIGURATION Size W64 W65 W66 W67 W68 64KB 1 & 2 1 & 2 2 & 3 2 & 3 1 & 2 128KB 2 & 3 1 & 2 1 & 2 1 & 2 2 & 3 256KB 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed SW1/1 25MHz On 33MHz Off 50iMHz On 66iMHz Off