ABIT COMPUTER CORPORATION AN4R2/AN4TR2 Processor 80486SX/CX486M7/80486DX/80486DX2/80486DX4 Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/ Speed 100(internal)MHz Chip Set Unidentified Max. 128MB Onboard DRAM Cache 128/256/512KB BIOS AMI/Award Dimensions 330mm x 218mm I/O 32-bit VESA local bus slots (3), green PC connector Options NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Power LED & JW1 External battery JP25 keylock Speaker JW2 Green PC connector JP46 (pins 1, (monitor) 3, 5) Reset switch JW3 Green PC connector JP46 (pins 7 & (power) 8) Turbo switch JW4 32-bit VESA local SL1 - SL3 bus slots Turbo LED JW5 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP3 Open alter » Factory configured - do not JP4 pins 1 & 2 alter closed » Factory configured - do not JP5 Open alter » Factory configured - do not JP6 Open alter » Factory configured - do not JP8 pins 1 & 2 alter closed » Factory configured - do not JP13 Closed alter » Factory configured - do not JP14 pins 1 & 2 alter closed » Factory configured - do not JP15 Open alter » Factory configured - do not JP16 Closed alter » Factory configured - do not JP17 Open alter » CMOS memory normal operation JP21 pins 1 & 2 closed CMOS memory clear JP21 pins 2 & 3 closed » Factory configured - do not JP41 Open alter » Factory configured - do not JP45 Open alter » Factory configured - do not JP49 pins 1 & 2 alter closed DRAM CONFIGURATION Size SIMM 1 - 4 SIMM 5 - 8 SIMM 9 SIMM 10 1MB NONE NONE (1) 256K x NONE 36 1MB (4) 256K x 9 NONE NONE NONE 1MB (4) 256K x 9 NONE NONE NONE 2MB NONE NONE (1) 256K x (1) 256K x 36 36 2MB (4) 256K x 9 NONE NONE (1) 256K x 36 2MB NONE NONE (1) 512K x NONE 36 2MB (4) 256K x 9 (4) 256K x 9 NONE NONE 4MB NONE NONE (1) 1M x 36 NONE 4MB (4) 1M x 9 NONE NONE NONE 4MB NONE NONE (1) 512K x (1) 512K x 36 36 4MB (4) 256K x 9 NONE (1) 512K x (1) 256K x 36 36 4MB (4) 256K x 9 (4) 256K x 9 (1) 512K x NONE 36 5MB NONE NONE (1) 256K x (1) 1M x 36 36 5MB (4) 256K x 9 NONE NONE (1) 1M x 36 6MB (4) 1M x 9 NONE (1) 256K x (1) 256K x 36 36 6MB (4) 256K x 9 NONE (1) 1M x 36 (1) 256K x 36 6MB NONE NONE (1) 512K x (1) 1M x 36 36 6MB (4) 256K x 9 (4) 256K x 9 (1) 1M x 36 NONE 8MB NONE NONE (1) 1M x 36 (1) 1M x 36 8MB (4) 1M x 9 NONE NONE (1) 1M x 36 8MB NONE NONE (1) 2M x 36 NONE 8MB (4) 1M x 9 NONE (1) 512K x (1) 512K x 36 36 8MB (4) 1M x 9 (4) 1M x 9 NONE NONE 10MB (4) 1M x 9 (4) 1M x 9 (1) 256K x (1) 256K x 36 36 10MB (4) 256K x 9 (4) 256K x 9 (1) 1M x 36 (1) 1M x 36 12MB (4) 1M x 9 NONE (1) 1M x 36 (1) 1M x 36 DRAM CONFIGURATION (CON’T) Size SIMM 1 - 4 SIMM 5 - 8 SIMM 9 SIMM 10 12MB (4) 1M x 9 NONE (1) 1M x 36 (1) 1M x 36 12MB (4) 1M x 9 (4) 1M x 9 (1) 512K x (1) 512K x 36 36 12MB (4) 1M x 9 (4) 1M x 9 (1) 1M x 36 NONE 16MB (4) 1M x 9 (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB NONE NONE (1) 4M x 36 NONE 16MB (4) 4M x 9 NONE NONE NONE 16MB NONE NONE (1) 2M x 36 (1) 2M x 36 16MB (4) 1M x 9 (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB (4) 4M x 9 NONE NONE NONE 17MB NONE NONE (1) 256K x (1) 4M x 36 36 17MB (4) 256K x 9 NONE NONE (1) 4M x 36 18MB (4) 4M x 9 NONE (1) 256K x (1) 256K x 36 36 18MB (4) 256K x 9 NONE (1) 4M x 36 (1) 256K x 36 18MB NONE NONE (1) 512K x (1) 4M x 36 36 18MB (4) 256K x 9 (4) 256K x 9 (1) 4M x 36 NONE 20MB NONE NONE (1) 1M x 36 (1) 4M x 36 20MB (4) 1M x 9 NONE NONE (1) 4M x 36 20MB (4) 4M x 9 NONE (1) 512K x (1) 512K x 36 36 24MB (4) 4M x 9 NONE (1) 1M x 36 (1) 1M x 36 24MB (4) 1M x 9 NONE (1) 4M x 36 (1) 1M x 36 24MB (4) 1M x 9 (4) 4M x 9 (1) 512K x (1) 512K x 36 36 24MB (4) 1M x 9 (4) 1M x 9 (1) 4M x 36 NONE 32MB NONE NONE (1) 4M x 36 (1) 4M x 36 32MB (4) 4M x 9 NONE NONE (1) 4M x 36 32MB NONE NONE (1) 8M x 36 NONE 32MB (4) 4M x 9 (4) 4M x 9 NONE NONE 36MB (4) 4M x 9 NONE (1) 1M x 36 (1) 4M x 36 36MB (4) 1M x 9 NONE (1) 4M x 36 (1) 4M x 36 36MB (4) 4M x 9 (4) 4M x 9 (1) 512K x (1) 512K x 36 36 36MB (4) 1M x 9 NONE (1) 8M x 36 NONE 36MB (4) 1M x 9 (4) 4M x 9 (1) 4M x 36 NONE 40MB (4) 4M x 9 (4) 4M x 9 (1) 1M x 36 (1) 1M x 36 40MB (4) 1M x 9 NONE (1) 8M x 36 (1) 1M x 36 40MB (4) 1M x 9 (4) 1M x 9 (1) 8M x 36 NONE 40MB (4) 1M x 9 (4) 1M x 9 (1) 4M x 36 (1) 4M x 36 48MB (4) 4M x 9 NONE (1) 4M x 36 (1) 4M x 36 48MB (4) 4M x 9 NONE (1) 4M x 36 (1) 4M x 36 48MB (4) 4M x 9 NONE (1) 8M x 36 NONE 48MB (4) 4M x 9 (4) 4M x 9 (1) 4M x 36 NONE 64MB (4) 4M x 9 (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 64MB NONE NONE (1) 16M x 36 NONE 64MB (4) 16M x 9 NONE NONE NONE 64MB NONE NONE (1) 8M x 36 (1) 8M x 36 64MB (4) 4M x 9 NONE (1) 8M x 36 (1) 4M x 36 DRAM CONFIGURATION (CON’T) Size SIMM 1 - 4 SIMM 5 - 8 SIMM 9 SIMM 10 64MB (4) 4M x 9 (4) 4M x 9 (1) 8M x 36 NONE 64MB (4) 4M x 9 (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 64MB (4) 16M x 9 NONE NONE NONE 65MB NONE NONE (1) 256K x (1) 16M x 36 36 65MB (4) 256K x 9 NONE NONE (1) 16M x 36 68MB NONE NONE (1) 1M x 36 (1) 16M x 36 68MB (4) 1M x 9 NONE NONE (1) 16M x 36 68MB (4) 1M x 9 (4) 16M x 9 NONE NONE 72MB (4) 16M x 9 NONE (1) 1M x 36 (1) 1M x 36 72MB (4) 1M x 9 NONE (1) 16M x 36 (1) 1M x 36 72MB (4) 1M x 9 (4) 1M x 9 (1) 16M x 36 NONE 80MB NONE NONE (1) 4M x 36 (1) 16M x 36 80MB (4) 4M x 9 NONE NONE (1) 16M x 36 80MB (4) 4M x 9 (4) 16M x 9 NONE NONE 96MB (4) 16M x 9 NONE (1) 4M x 36 (1) 4M x 36 96MB (4) 4M x 9 NONE (1) 16M x 36 (1) 4M x 36 96MB (4) 4M x 9 (4) 4M x 9 (1) 16M x 36 NONE 128MB NONE NONE (1) 16M x 36 (1) 16M x 36 128MB (4) 16M x 9 NONE NONE (1) 16M x 36 128MB (4) 16M x 9 (4) 16M x 9 NONE NONE DRAM JUMPER CONFIGURATION Bank 0 Bank 1 Bank 2 Bank 3 JP18 JP19 JP20 JP22 SIMM 1 SIMM 5 SIMM 9 SIMM 1 & 2 1 & 2 Open 1 & 2 - 4 - 8 10 SIMM 1 SIMM 5 SIMM 9 NONE 1 & 2 1 & 2 Open 1 & 2 - 4 - 8 SIMM 1 SIMM 9 NONE NONE 1 & 2 Open Open 1 & 2 - 4 SIMM 1 SIMM SIMM 9 NONE 1 & 2 Open Open 1 & 2 - 4 10 SIMM 9 SIMM SIMM 1 SIMM 5 2 & 3 2 & 3 Open 2 & 3 10 - 4 - 8 SIMM 9 SIMM NONE NONE Open Open Closed 2 & 3 10 SIMM 1 SIMM SIMM 9 NONE 1 & 2 Open Open 1 & 2 - 4 10 SIMM 9 SIMM SIMM 1 SIMM 5 2 & 3 2 & 3 Open 2 & 3 10 - 4 - 8 Note: Pins designated should be in the closed position. DRAM JUMPER CONFIGURATION (CON’T) Bank 0 Bank 1 Bank 2 Bank 3 JP23 JP24 JP50 JP51 SIMM 1 SIMM 5 SIMM 9 SIMM Open 1 & 2 Open Open - 4 - 8 10 SIMM 1 SIMM 5 SIMM 9 NONE 1 & 2 Open Open Open - 4 - 8 SIMM 1 SIMM 9 NONE NONE 2 & 3 Open Open Open - 4 SIMM 1 SIMM SIMM 9 NONE 1 & 2 2 & 3 Open Open - 4 10 SIMM 9 SIMM SIMM 1 SIMM 5 Open 2 & 3 Closed 2 & 3 10 - 4 - 8 SIMM 9 SIMM NONE NONE 2 & 3 Open Open 1 & 2 10 SIMM 1 SIMM SIMM 9 NONE 1 & 2 2 & 3 Open Open - 4 10 SIMM 9 SIMM SIMM 1 SIMM 5 Open 2 & 3 Open Open 10 - 4 - 8 Note: Pins designated should be in the closed position. CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 512KB (4) 128K x 8 NONE (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP1 JP2 JP42 JP44 128KB pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed closed 256KB pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed closed 512KB pins 1 & 2 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed closed CPU TYPE CONFIGURATION Type JP9 JP12 JP30 JP31 JP32 80486SX 2 & 3 2 & 3 2 & 3 Open 2 & 3 SL80486SX 2 & 3 2 & 3 2 & 3 Open 2 & 3 CX486M7 2 & 3 2 & 3 1 & 2 2 & 3 2 & 3 80486DX/DX2 2 & 3 2 & 3 1 & 2 2 & 3 2 & 3 SL80486DX/DX2 2 & 3 2 & 3 1 & 2 2 & 3 2 & 3 80486DX4 1 & 2 1 & 2 1 & 2 2 & 3 2 & 3 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP33 JP34 JP35 JP36 JP37 80486SX Closed Open Open Open Open SL80486SX Open 4 & 5 3 & 4 2 & 3 Open CX486M7 Closed 2 & 3 2 & 3 1 & 2, 3 Open & 4 80486DX/DX2 Closed 4 & 5 3 & 4 2 & 3 Open SL80486DX/DX2 Closed 4 & 5 3 & 4 2 & 3 Open 80486DX4 Closed 4 & 5 3 & 4 2 & 3 Open Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP38 JP39 JP43 JP47 JP48 80486SX 1 & 2 Open 2 & 3 2 & 3 1 & 2 SL80486SX Open Open 2 & 3 2 & 3 1 & 2 CX486M7 2 & 3 2 & 3 1 & 2 1 & 2 2 & 3 80486DX/DX2 Open Open 2 & 3 2 & 3 1 & 2 SL80486DX/DX2 Open Open 2 & 3 2 & 3 1 & 2 80486DX4 Open Open 2 & 3 2 & 3 1 & 2 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION (AVASEM AV9107 CLOCK GENERATOR) Speed JP10 JP11 JP26 JP27 20MHz Open Open Closed Open 25MHz Open Open Open Closed 33MHz Open Open Closed Closed 40MHz Open Open Open Open 50iMHz Open Open Open Closed 50MHz Open Open Closed Open 66iMHz Open Open Closed Closed 75iMHz Open pins 1 & 2 Open Closed closed 80iMHz Closed Open Closed Closed 100iMHz Open pins 1 & 2 Closed Closed closed CPU SPEED CONFIGURATION (AVASEM AV9107 CLOCK GENERATOR, CON’T) Speed JP28 JP29 JP40 20MHz Closed Closed Open 25MHz Closed Closed Open 33MHz Closed Open Open 40MHz Closed Closed Open 50iMHz Closed Closed Open 50MHz Closed Open Open 66iMHz Closed Open Open 75iMHz Open Closed pins 2 & 3 closed 80iMHz Open Open pins 2 & 3 closed 100iMHz Open Open pins 1 & 2 closed CPU SPEED CONFIGURATION (MXIC MX8315 CLOCK GENERATOR) Speed JP10 JP11 JP26 JP27 20MHz Open Open Open Open 25MHz Open Open Open Closed 33MHz Open Open Closed Closed 40MHz Open Open Closed Closed 50iMHz Open Open Open Closed 50MHz Open Open Closed Open 66iMHz Open Open Closed Closed 75iMHz Open pins 1 & 2 Open Closed closed 80iMHz Closed Open Closed Closed 100iMHz Open pins 1 & 2 Closed Closed closed CPU SPEED CONFIGURATION (MXIC MX8315 CLOCK GENERATOR, CON’T) Speed JP28 JP29 JP40 20MHz Closed Open Open 25MHz Closed Open Open 33MHz Closed Closed Open 40MHz Closed Open Open 50iMHz Closed Open Open 50MHz Closed Open Open 66iMHz Closed Closed Open 75iMHz Open Closed pins 2 & 3 closed 80iMHz Open Closed pins 2 & 3 closed 100iMHz Open Closed pins 1 & 2 closed BUS SPEED CONFIGURATION CPU speed JP7 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed