ABIT COMPUTER CORPORATION PM4T (REV. 1.0) Processor 80486SX/SL80486SX/AM486DX/CX486DX/80486DX/SL80486DX/CX486DX2/ CX486DX2V/AM486DX2/(SL)AM486DX2/80486DX2/SL80486DX2/AM486DX4/ 80486DX4/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)MHz Speed Chip Set Unidentified Max. 256MB Onboard DRAM Cache 128/256KB BIOS Award Dimensions 330mm x 218mm I/O 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE Options interfaces (2), parallel port, PS/2 mouse port, serial ports (2) NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location IDE interface 1 CN1 Speaker JW2 IDE interface 2 CN2 Turbo LED JW3 Parallel port CN3 Turbo switch JW4 Floppy drive interface CN4 Reset switch JW5 Serial port 1 J3 IDE interface LED JW6 Serial port 2 J4 IDE interface LED JW7 External battery JP42 PS/2 mouse port MS1 Green PC connector JP43 32-bit PCI slots PC1 - PC4 Power LED & keylock JW1 Note: The location of JP42 is unidentified. USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP1 N/A alter » CPU type select non 5v CPU JP18 pins 3 & 5, 4 & 6 closed CPU type select 5v CPU JP18 pins 1 & 3, 2 & 4 closed » Factory configured - do not JP23 Open alter » Factory configured - do not JP25 Open alter » Factory configured - do not JP27 N/A alter » Factory configured - do not JP30 N/A alter » Factory configured - do not JP31 N/A alter » Factory configured - do not JP33 N/A alter » CMOS memory normal operation JP37 pins 1 & 2 closed CMOS memory clear JP37 pins 2 & 3 closed » Factory configured - do not JP51 Open alter 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 2MB (1) 512K x NONE NONE NONE 36 3MB (1) 512K x (1) 256K x NONE NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 36 36 4MB (1) 512K 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 4MB (1) 512K x (1) 512K x NONE NONE 36 36 5MB (1) 1M x 36 (1) 256K x NONE NONE 36 5MB (1) 512K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x NONE 36 36 6MB (1) 512K x (1) 1M x 36 NONE NONE 36 6MB (1) 512K x (1) 512K x (1) 512K x NONE 36 36 36 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 8MB (1) 2M x 36 NONE NONE NONE 8MB (1) 512K x (1) 512K x (1) 512K x (1) 512K x 36 36 36 36 9MB (1) 2M x 36 (1) 256K x NONE NONE 36 10MB (1) 2M x 36 (1) 256K x (1) 256K x NONE 36 36 10MB (1) 512K x (1) 1M x 36 (1) 1M x 36 NONE 36 10MB (1) 512K x (1) 2M x 36 NONE NONE 36 11MB (1) 2M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 12MB (1) 1M x 36 (1) 2M x 36 NONE NONE 12MB (1) 2M x 36 (1) 1M x 36 NONE NONE 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 14MB (1) 512K x (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 36 16MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 2M x 36 (1) 2M x 36 NONE NONE 16MB (1) 4M x 36 NONE NONE NONE 17MB (1) 4M x 36 (1) 256K x NONE NONE 36 18MB (1) 4M x 36 (1) 256K x (1) 256K x NONE 36 36 18MB (1) 512K x (1) 2M x 36 (1) 2M x 36 NONE 36 18MB (1) 512K x (1) 4M x 36 NONE NONE 36 19MB (1) 4M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 20MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 NONE 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE 20MB (1) 2M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE 24MB (1) 2M x 36 (1) 4M x 36 NONE NONE 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 24MB (1) 4M x 36 (1) 2M x 36 NONE NONE 24MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 NONE 26MB (1) 512K x (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 36 28MB (1) 1M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 32MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 NONE 32MB (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 32MB (1) 8M x 36 NONE NONE NONE 33MB (1) 8M x 36 (1) 256K x NONE NONE 36 34MB (1) 8M x 36 (1) 256K x (1) 256K x NONE 36 36 34MB (1) 512K x (1) 4M x 36 (1) 4M x 36 NONE 36 34MB (1) 512K x (1) 8M x 36 NONE NONE 36 35MB (1) 8M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 36MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 NONE 36MB (1) 1M x 36 (1) 8M x 36 NONE NONE 36MB (1) 8M x 36 (1) 1M x 36 NONE NONE 40MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 NONE DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 40MB (1) 2M x 36 (1) 8M x 36 NONE NONE 40MB (1) 4M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 40MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 NONE 40MB (1) 8M x 36 (1) 2M x 36 NONE NONE 44MB (1) 8M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 48MB (1) 4M x 36 (1) 8M x 36 NONE NONE 48MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 NONE 48MB (1) 8M x 36 (1) 4M x 36 NONE NONE 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 50MB (1) 512K x (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 36 52MB (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 56MB (1) 2M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 56MB (1) 8M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 64MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 8M x 36 (1) 8M x 36 NONE NONE 64MB (1) 16M x 36 NONE NONE NONE 65MB (1) 16M x 36 (1) 256K x NONE NONE 36 66MB (1) 16M x 36 (1) 256K x (1) 256K x NONE 36 36 66MB (1) 512K x (1) 8M x 36 (1) 8M x 36 NONE 36 66MB (1) 512K x (1) 16M x 36 NONE NONE 36 67MB (1) 16M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 68MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 NONE 68MB (1) 1M x 36 (1) 16M x 36 NONE NONE 68MB (1) 16M x 36 (1) 1M x 36 NONE NONE 72MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 NONE 72MB (1) 2M x 36 (1) 16M x 36 NONE NONE 72MB (1) 16M x 36 (1) 1M x 36 (1) 1M x 36 NONE 72MB (1) 16M x 36 (1) 2M x 36 NONE NONE 76MB (1) 16M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 80MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 NONE 80MB (1) 4M x 36 (1) 16M x 36 NONE NONE 80MB (1) 8M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 80MB (1) 16M x 36 (1) 2M x 36 (1) 2M x 36 NONE 80MB (1) 16M x 36 (1) 4M x 36 NONE NONE 88MB (1) 16M x 36 (1) 2M x 36 (1) 2M x 36 (1) 2M x 36 96MB (1) 8M x 36 (1) 16M x 36 NONE NONE 96MB (1) 16M x 36 (1) 4M x 36 (1) 4M x 36 NONE 96MB (1) 16M x 36 (1) 8M x 36 NONE NONE 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 NONE 98MB (1) 512K x (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 36 100MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 104MB (1) 2M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 112MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 112MB (1) 16M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 128MB (1) 16M x 36 (1) 8M x 36 (1) 8M x 36 NONE 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 128MB (1) 16M x 36 (1) 16M x NONE NONE 36 130MB (1) 512K x (1) 16M x (1) 16M x NONE 36 36 36 132MB (1) 1M x 36 (1) 16M x (1) 16M x NONE 36 36 136MB (1) 2M x 36 (1) 16M x (1) 16M x NONE 36 36 144MB (1) 4M x 36 (1) 16M x (1) 16M x NONE 36 36 160MB (1) 8M x 36 (1) 16M x (1) 16M x NONE 36 36 160MB (1) 16M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 192MB (1) 16M x 36 (1) 16M x (1) 16M x NONE 36 36 194MB (1) 512K x (1) 16M x (1) 16M x (1) 16M x 36 36 36 36 196MB (1) 1M x 36 (1) 16M x (1) 16M x (1) 16M x 36 36 36 200MB (1) 2M x 36 (1) 16M x (1) 16M x (1) 16M x 36 36 36 208MB (1) 4M x 36 (1) 16M x (1) 16M x (1) 16M x 36 36 36 224MB (1) 8M x 36 (1) 16M x (1) 16M x (1) 16M x 36 36 36 256MB (1) 16M x 36 (1) 16M x (1) 16M x (1) 16M x 36 36 36 Note: Board will accept x 32 SIMMs also. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 NONE (1) 8K or (1) 16K x 8 256KB (A) (4) 32K x 8 (4) 32K x 8 (1) 16K or (1) 32K x 8 256KB (B) (4) 64K x 8 NONE (1) 16K or (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP2 JP3 JP6 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 256KB (A) pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 256KB (B) pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed CPU TYPE CONFIGURATION Type RN6 RN10 RN14 RN16 RN17 80486SX Not 1 - 8 Not Not 9 - installed installed installed 16 SL80486SX Not 1 - 8 Not Not 9 - installed installed installed 16 AM486DX Not 1 - 8 1 - 8 Not 5 - installed installed 12 CX486DX 1 - 8 Not 1 - 8 Not 1 - installed installed 8 80486DX Not 1 - 8 1 - 8 Not 5 - installed installed 12 SL80486DX Not 1 - 8 1 - 8 Not 5 - installed installed 12 CX486DX2 1 - 8 Not 1 - 8 Not 1 - installed installed 8 CX486DX2V 1 - 8 Not 1 - 8 Not 1 - installed installed 8 AM486DX2 Not 1 - 8 1 - 8 Not 5 - installed installed 12 (SL)AM486DX2 Not 1 - 8 1 - 8 Not 5 - installed installed 12 80486DX2 Not 1 - 8 1 - 8 Not 5 - installed installed 12 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type RN6 RN10 RN14 RN16 RN17 SL80486DX2 Not 1 - 8 1 - 8 Not 5 - 12 installed installed AM486DX4 Not 1 - 8 1 - 8 Not 5 - 12 installed installed 80486DX4 Not 1 - 8 1 - 8 Not 5 - 12 installed installed P24D Not 1 - 8 1 - 8 1 - 8 Not installed installed P24T Not 3 - 3 - 9 - 16 Not installed 10 10 installed Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP13 JP24 JP32 80486SX Open Open Open SL80486SX Open Open Open AM486DX pins 1 & 2 Open Open closed CX486DX Open Open Open 80486DX Open Open Open SL80486DX Open Open Open CX486DX2 Open Open Open CX486DX2V Open Open Open AM486DX2 pins 1 & 2 Open Open closed (SL)AM486DX2 pins 1 & 2 Open Closed closed 80486DX2 Open Open Open SL80486DX2 Open Open Open AM486DX4 pins 1 & 2 Open Open closed 80486DX4 Open Open Open P24D Open pins 1 & 2 Open closed P24T Open Open Open CPU SPEED CONFIGURATION Speed JP12 JP14 25MHz Open Open 33MHz Closed Closed 40MHz Open Closed 50iMHz Open Open 66iMHz Closed Closed 75iMHz Open Open 80iMHz Open Closed 100iMHz Closed Closed CPU VOLTAGE CONFIGURATION Voltage JP18 JP19 JP20 JP21 JP22 3.3v pins 3 & 5, Closed Open Open Open 4 & 6 closed 3.45v pins 3 & 5, Open Closed Open Open 4 & 6 closed 3.6v pins 3 & 5, Open Open Closed Open 4 & 6 closed 4v pins 3 & 5, Open Open Open Closed 4 & 6 closed 5v pins 1 & 3, N/A N/A N/A N/A 2 & 4 closed