ABIT COMPUTER CORPORATION PB4 (REV.1.1) Processor 80486SX/SL AM486DX/80486DX/CX486DX2/AM486DX2/80486DX2/ CX486DX4/80486DX4/CX M1/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)/ Speed 120(internal)MHz Chip Set Unidentified Max. 64MB Onboard DRAM Cache 128/256KB BIOS Award Dimensions 220mm x 220mm I/O 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE Options interfaces (2), parallel port, serial ports (2), PISA slot NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Floppy drive interface CN1 Power LED & keylock JW1 Parallel port CN2 Speaker JW2 IDE interface 2 CN3 Turbo LED JW3 IDE interface 1 CN4 Turbo switch JW4 Serial port 2 J3 Reset switch JW5 Serial port 1 J4 32-bit PCI slots PC1 - PC3 IDE interface LED JP16 PISA slot SL1 External battery JP18 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP12 pins 1 & 2 alter closed » Factory configured - do not JP13 Open alter » Factory configured - do not JP14 Open alter » CMOS memory normal operation JP17 pins 1 & 2 closed CMOS memory clear JP17 pins 2 & 3 closed Note: The location of jumpers JP12 and JP14 are unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (1) 256K x 36 NONE 2MB (1) 512K x 36 NONE 2MB (1) 256K x 36 (1) 256K x 36 3MB (1) 256K x 36 (1) 512K x 36 3MB (1) 512K x 36 (1) 256K x 36 4MB (1) 1M x 36 NONE 4MB (1) 512K x 36 (1) 512K x 36 5MB (1) 256K x 36 (1) 1M x 36 5MB (1) 1M x 36 (1) 256K x 36 6MB (1) 512K x 36 (1) 1M x 36 6MB (1) 1M x 36 (1) 512K x 36 8MB (1) 2M x 36 NONE 8MB (1) 1M x 36 (1) 1M x 36 9MB (1) 256K x 36 (1) 2M x 36 9MB (1) 2M x 36 (1) 256K x 36 10MB (1) 512K x 36 (1) 2M x 36 10MB (1) 2M x 36 (1) 512K x 36 12MB (1) 1M x 36 (1) 2M x 36 12MB (1) 2M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE 16MB (1) 2M x 36 (1) 2M x 36 17MB (1) 256K x 36 (1) 4M x 36 17MB (1) 4M x 36 (1) 256K x 36 18MB (1) 512K x 36 (1) 4M x 36 18MB (1) 4M x 36 (1) 512K x 36 20MB (1) 1M x 36 (1) 4M x 36 20MB (1) 4M x 36 (1) 1M x 36 24MB (1) 2M x 36 (1) 4M x 36 24MB (1) 4M x 36 (1) 2M x 36 32MB (1) 8M x 36 NONE 32MB (1) 4M x 36 (1) 4M x 36 33MB (1) 256K x 36 (1) 8M x 36 33MB (1) 8M x 36 (1) 256K x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 34MB (1) 512K x 36 (1) 8M x 36 34MB (1) 8M x 36 (1) 512K x 36 36MB (1) 1M x 36 (1) 8M x 36 36MB (1) 8M x 36 (1) 1M x 36 40MB (1) 2M x 36 (1) 8M x 36 40MB (1) 8M x 36 (1) 2M x 36 48MB (1) 4M x 36 (1) 8M x 36 48MB (1) 8M x 36 (1) 4M x 36 64MB (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 TAG 128KB (4) 32K x 8 (1) 16K or (1) 32K x 8 256KB (4) 64K x 8 (1) 16K or (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP3 128KB pins 1 & 2 closed 256KB pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP5 JP8 JP9 80486SX Open Open Open SL AM486DX pins 2 & 3 Open pins 1 & 2 closed closed 80486DX Open Open Open CX486DX2 pins 1 & 2 Open pins 2 & 3 closed closed AM486DX2 Open Closed Open 80486DX2 Open Open Open CX486DX4 pins 1 & 2 Open pins 2 & 3 closed closed AM486DX4 Open Open Open 80486DX4 Open Open Open CX M1 pins 2 & 3 Open pins 1 & 2 closed closed P24D pins 2 & 3 Open pins 1 & 2 closed closed P24T Open Open Open CPU TYPE CONFIGURATION Type RJ1 RJ2 RJ3 80486SX pins 1 - 8 Installed Not installed closed SL AM486DX pins 3 - 10 Installed Not installed closed 80486DX pins 1 - 8 Installed Not installed closed CX486DX2 pins 1 - 8 Not installed Installed closed AM486DX2 pins 1 - 8 Installed Not installed closed 80486DX2 pins 1 - 8 Installed Not installed closed CX486DX4 pins 1 - 8 Not installed Installed closed AM486DX4 pins 1 - 8 Installed Not installed closed 80486DX4 pins 1 - 8 Installed Not installed closed CX M1 pins 1 - 8 Installed Not installed closed P24D pins 3 - 10 Installed Not installed closed P24T pins 7 - 14 Installed Not installed closed Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP4 JP11 25MHz Open Open 33MHz Closed Closed 40MHz Closed Open 50iMHz Open Open 66iMHz Closed Closed 75iMHz Open Open 80iMHz Closed Open 100iMHz Closed Closed 120iMHz Closed Open CPU VOLTAGE CONFIGURATION Voltage JP1 JP2 3.45v pins 1 & 2 closed pins 2 & 3 closed 3.6v pins 2 & 3 closed pins 2 & 3 closed 4v pins 4 & 5 closed pins 2 & 3 closed 5v pins 1 & 2 closed pins 1 & 2 closed