ABIT COMPUTER CORPORATION PI4/PI4T PCI Processor 80486SX/SL80486SX/CX486M7/AM486DX/AM486DXL PLUS/80486DX/ SL80486DX2/AM486DX2/80486DX2/AM486DX4/80486DX4/P24D/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/ Speed 100(internal)MHz Chip Set Unidentified Max. 128MB Onboard DRAM Cache 128/256/512/1024KB BIOS AMI/Award Dimensions 330mm x 218mm I/O 32-bit PCI bus slots (3), green PC connector, IDE interfaces (2) Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location External battery J3 Speaker J10 IDE interface (primary) J4 Power LED & keylock J11 IDE interface J5 IDE interface LED JP10 (secondary) Green PC connector J6 IDE interface LED JP11 Turbo LED J7 Green PC connector JP38 Reset switch J8 32-bit PCI bus slots SL1 - SL3 Turbo switch J9 USER CONFIGURABLE SETTINGS Function Jumper Position » CX486S2 CPU not installed JP1 Open CX486S2 CPU installed JP1 Closed » Cache type select write back JP2 pins 1 & 2 (P24D only) closed Cache type select write through JP2 pins 2 & 3 (P24D only) closed » Cache type select write back JP3 pins 1 & 2 (P24T only) closed Cache type select write through JP3 pins 2 & 3 (P24T only) closed » Primary IDE IRQ14 enabled JP12 Closed Primary IDE IRQ14 disabled JP12 Open » Secondary IDE IRQ15 enabled JP13 Closed Secondary IDE IRQ15 disabled JP13 Open » Factory configured - do not JP14 pins 2 & 3 alter closed » Factory configured - do not JP26 pins 2 & 3 alter closed » Factory configured - do not JP27 pins 2 & 3 alter closed » Factory configured - do not JP28 pins 2 & 3, 4 & alter 5 closed » Factory configured - do not JP40 pins 1 & 2 alter closed » Factory configured - do not JP43 pins 2 & 3 alter closed » Monitor type select color JP44 Closed Monitor type select monochrome JP44 Open Note: The location of the factory configured jumpers is unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB (1) 1M x 36 NONE NONE NONE 5MB (1) 256K x (1) 1M x 36 NONE NONE 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 8MB (1) 2M x 36 NONE NONE NONE 12MB (1) 512K x (1) 512K 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 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) 256K x (1) 4M x 36 NONE NONE 36 20MB (1) 512K x (1) 512K x (1) 4M x 36 NONE 36 36 20MB (1) 1M x 36 (1) 4M x 36 NONE NONE 24MB (1) 512K x (1) 512K x (1) 1M x 36 (1) 4M x 36 36 36 24MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 NONE 24MB (1) 2M 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 36MB (1) 512K x (1) 512K x (1) 4M x 36 (1) 4M 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 40MB (1) 1M x 36 (1) 1M x 36 (1) 4M x 36 (1) 4M x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 40MB (1) 1M x 36 (1) 1M x 36 (1) 8M x 36 NONE 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 48MB (1) 4M x 36 (1) 8M x 36 NONE NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 64MB (1) 16M x 36 NONE NONE NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 8M x 36 NONE 64MB (1) 8M x 36 (1) 8M x 36 NONE NONE 65MB (1) 256K x (1) 16M x NONE NONE 36 36 68MB (1) 1M x 36 (1) 16M x NONE NONE 36 68MB (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 NONE 72MB (1) 1M x 36 (1) 1M x 36 (1) 16M x NONE 36 72MB (1) 1M x 36 (1) 1M x 36 (1) 8M x 36 (1) 8M x 36 80MB (1) 4M x 36 (1) 16M x NONE NONE 36 80MB (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 NONE 96MB (1) 4M x 36 (1) 4M x 36 (1) 16M x NONE 36 96MB (1) 4M x 36 (1) 4M x 36 (1) 8M x 36 (1) 8M x 36 96MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 NONE 128MB (1) 16M x 36 (1) 16M x NONE NONE 36 128MB (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 (1) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 NONE (1) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 256KB (4) 64K x 8 NONE (1) 32K x 8 512KB (4) 64K x 8 (4) 64K x 8 (1) 32K x 8 512KB (4) 128K x 8 NONE (1) 32K x 8 1MB (4) 128K x 8 (4) 128K x 8 (1) 64K x 8 CACHE JUMPER CONFIGURATION Size JP23 JP24 JP25 JP36 JP37 128KB 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2, 3 & 4 256KB 2 & 3 1 & 2 2 & 3 1 & 2 2 & 3, 4 & 5 256KB 2 & 3 1 & 2 1 & 2 1 & 2 1 & 2, 3 & 4 512KB 2 & 3 2 & 3 2 & 3 1 & 2 2 & 3, 4 & 5 512KB 2 & 3 2 & 3 1 & 2 1 & 2 1 & 2, 3 & 4 1MB 2 & 3 2 & 3 2 & 3 1 & 2 2 & 3, 4 & 5 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type JP4 JP7 JP8 JP9 JP15 80486SX 1 & 2, 3 Open Open 2 & 3 Open & 4 SL80486SX 1 & 2, 3 3 & 4 Open 2 & 3 Open & 4 CX486M7 (3v) Open 2 & 3 2 & 3 1 & 2, 3 & 4 3 & 4 CX486M7 (5v) 1 & 2, 3 2 & 3 2 & 3 1 & 2, 3 & 4 & 4 3 & 4 AM486DX/DX2 (5v) 1 & 2, 3 Open Open 1 & 2, 3 & 4 & 4 3 & 4 AM486DX2/DX4 (3v) Open Open Open 1 & 2, 3 & 4 3 & 4 AM486DXL PLUS 1 & 2, 3 3 & 4 Open 1 & 2, 3 & 4 & 4 3 & 4 80486DX/DX2 1 & 2, 3 Open Open 1 & 2, 3 & 4 & 4 3 & 4 SL80486DX/DX2 1 & 2, 3 3 & 4 Open 1 & 2, 3 & 4 & 4 3 & 4 80486DX4 Open 3 & 4 Open 1 & 2, 3 & 4 3 & 4 P24D 1 & 2, 3 1 & 2, 3 Open 1 & 2, 3 & 4 & 4 & 4 3 & 4 P24T 1 & 2, 3 3 & 4 1 & 2 1 & 2, 2 & 3 & 4 3 & 4 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP16 JP17 JP18 JP19 80486SX 2 & 3 Open Open Open SL80486SX 2 & 3 Open 1 & 2 Open CX486M7 (3v) 1 & 2 Open 1 & 2 Open CX486M7 (5v) 1 & 2 Open 1 & 2 Open AM486DX/DX2 (5v) Open Open Open Open AM486DX2/DX4 (3v) Open Open Open Open AM486DXL PLUS 2 & 3 Open 1 & 2 2 & 3 80486DX/DX2 2 & 3 Open Open Open SL80486DX/DX2 2 & 3 Open 1 & 2 Open 80486DX4 2 & 3 Open 1 & 2 Open P24D 1 & 2 1 & 2 1 & 2 1 & 2 P24T 1 & 2 1 & 2 1 & 2 Open Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP20 JP21 JP22 JP39 80486SX Open Open Open 1 & 2 SL80486SX 2 & 3 1 & 2 4 & 5 1 & 2 CX486M7 (3v) 1 & 2 Open 2 & 3 1 & 2 CX486M7 (5v) 1 & 2 Open 2 & 3 1 & 2 AM486DX/DX2 (5v) Open Open Open 1 & 2 AM486DX2/DX4 (3v) Open Open Open 1 & 2 AM486DXL PLUS 2 & 3 4 & 5 4 & 5 1 & 2 80486DX/DX2 Open Open Open 1 & 2 SL80486DX/DX2 2 & 3 1 & 2 4 & 5 1 & 2 80486DX4 2 & 3 1 & 2 4 & 5 Open P24D 2 & 3 2 & 3 4 & 5 1 & 2 P24T 2 & 3 Open 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP46 JP47 JP48 JP49 JP50 AM486DX2 Open Closed Open Closed Closed CX486DX2-50 Closed Open Open Open Open CX486DX2-66 Open Open Closed Open Open CX486DX2-80 Open Open Open Closed Open AM486DX/DX4 Open Closed Open Closed Open 80486DX4-75 Closed Open Open Open Open 80486DX4-100 Open Closed Open Closed Open Note: Pins designated should be in the closed position. These settings used only if JP4 is open. CPU SPEED CONFIGURATION Speed JP30 JP31 JP32 JP33 25MHz Open Open Open pins 1 & 2 closed 33MHz Open Closed Closed pins 1 & 2 closed 40MHz Open Open Closed pins 2 & 3 closed 50iMHz Open Open Open pins 1 & 2 closed 50MHz Open Closed Open pins 2 & 3 closed 66iMHz Open Closed Closed pins 1 & 2 closed 75iMHz Open Open Open pins 1 & 2 closed 80iMHz Open Open Closed pins 2 & 3 closed 100iMHz Open Closed Closed pins 1 & 2 closed CMOS DISCHARGE CONFIGURATION Setting JP6 JP35 CMOS memory normal pins 1 & 2 closed pins 1 & 2 closed operation CMOS memory clear pins 2 & 3 closed pins 2 & 3 closed