ABIT COMPUTER CORPORATION AN4R2/AN4TR2 REV. 1.1 & REV. 1.2 Processor SL80486SX/80486SX/CX486DX/SL80486DX/80486DX/CX486DX2/AM486DX2/SL80486DX2/80486DX2/80486DX4 Processor 20/25/33/40/50(internal)/66(internal)/75(internal)/83(internal)/100(internal)MHz Speed 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 External battery JP25 Reset switch JW3 Green PC connector JP46 pins 1 - Turbo switch JW4 (monitor) 3 Green PC connector JP46 pins 7 & Turbo LED JW5 8 Power LED & keylock JW1 32-bit VESA local SL1 - SL3 bus slots Speaker JW2 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP3 pins 2 & 3 alter closed » Factory configured - do not JP4 pins 1 & 2 alter closed » Factory configured - do not JP6 N/A alter » 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 » 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 JP49 pins 1 & 2 alter closed » Factory configured - do not JP52 N/A alter » Factory configured - do not JP60 N/A alter » Factory configured - do not JP62 N/A alter 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 256KB (4) 64K x 8 NONE (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 1 & 2 pins 2 & 3 closed closed closed closed 256KB pins 1 & 2 pins 1 & 2 pins 1 & 2 pins 2 & 3 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 JP33 SL80486SX 2 & 3 2 & 3 2 & 3 Open Open 80486SX 2 & 3 2 & 3 2 & 3 Open Open CX486DX 2 & 3 2 & 3 1 & 2 3 & 4 Closed SL80486DX 2 & 3 2 & 3 1 & 2 3 & 4 Closed 80486DX 2 & 3 2 & 3 1 & 2 3 & 4 Closed CX486DX2 1 & 2 1 & 2 1 & 2 3 & 4 Closed AM486DX2 1 & 2 1 & 2 1 & 2 3 & 4 Closed SL80486DX2 2 & 3 2 & 3 1 & 2 3 & 4 Closed 80486DX2 2 & 3 2 & 3 1 & 2 3 & 4 Closed 80486DX4 1 & 2 1 & 2 1 & 2 3 & 4 Closed Note: Pins designated should be in the closed position. The 80486DX4 CPU is only available on the AN4TR2 mainboard. CPU TYPE CONFIGURATION (CON’T) Type JP34 JP35 JP36 JP38 SL80486SX 4 & 5 3 & 4 2 & 3 Open 80486SX 4 & 5 3 & 4 2 & 3 Open CX486DX 2 & 3 2 & 3 1 & 2, 3 & 2 & 3 4 SL80486DX 4 & 5 3 & 4 2 & 3 Open 80486DX 4 & 5 3 & 4 2 & 3 Open CX486DX2 2 & 3 2 & 3 1 & 2 2 & 3 AM486DX2 4 & 5 3 & 4 2 & 3 Open SL80486DX2 4 & 5 3 & 4 2 & 3 Open 80486DX2 4 & 5 3 & 4 2 & 3 Open 80486DX4 4 & 5 3 & 4 2 & 3 Open Note: Pins designated should be in the closed position. The 80486DX4 CPU is only available on the AN4TR2 mainboard. CPU TYPE CONFIGURATION (CON’T) Type JP39 JP43 JP47 JP48 JP63 SL80486SX Open 2 & 3 2 & 3 1 & 2 Open 80486SX Open 2 & 3 2 & 3 1 & 2 Open CX486DX 2 & 3 1 & 2 1 & 2 2 & 3 Open SL80486DX Open 2 & 3 2 & 3 1 & 2 Open 80486DX Open 2 & 3 2 & 3 1 & 2 Open CX486DX2 2 & 3 1 & 2 1 & 2 2 & 3 Open AM486DX2 Open 2 & 3 2 & 3 1 & 2 1 & 2 SL80486DX2 Open 2 & 3 2 & 3 1 & 2 Open 80486DX2 Open 2 & 3 2 & 3 1 & 2 Open 80486DX4 Open 2 & 3 2 & 3 1 & 2 Open Note: Pins designated should be in the closed position. The 80486DX4 CPU is only available on the AN4TR2 mainboard. CPU SPEED CONFIGURATION (AVASEM AV9107) Speed JP8 JP10 JP11 JP26 JP27 JP28 JP29 20MHz 2 & Open Open Closed Open 1 & 2 Closed 3 25MHz 2 & Open Open Open Closed 1 & 2 Closed 3 33MHz 2 & Open Open Closed Closed 1 & 2 Open 3 40MHz 2 & Open Open Open Open 1 & 2 Closed 3 50iMHz 2 & Open Open Open Closed 1 & 2 Closed 3 66iMHz 2 & Open Open Closed Closed 1 & 2 Open 3 75iMHz 2 & Open 1 & 2 Open Closed Open Closed 3 83iMHz 2 & Closed Open Closed Closed Open Open 3 100iMHz 2 & Open 1 & 2 Closed Closed Open Open 3 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION (MX8315) Speed JP8 JP10 JP11 JP26 JP27 JP28 JP29 20MHz 1 & Open Open Open Open 1 & 2 Open 2 25MHz 1 & Open Open Open Closed 1 & 2 Open 2 33MHz 1 & Open Open Closed Closed 1 & 2 Closed 2 40MHz 1 & Open Open Closed Closed 1 & 2 Open 2 50iMHz 1 & Open Open Open Closed 1 & 2 Open 2 66iMHz 1 & Open Open Closed Closed 1 & 2 Closed 2 75iMHz 1 & Open 1 & 2 Open Closed Open Closed 2 83iMHz 1 & Closed Open Closed Closed Open Closed 2 100iMHz 1 & Open 1 & 2 Closed Closed Open Closed 2 Note: Pins designated should be in the closed position. CPU VOLTAGE CONFIGURATION Voltage JP53 JP54 JP55 JP56 3.3v pins 1 & 2 Open Open Open closed 3.45v Open pins 1 & 2 Open Open closed 3.6v Open Open pins 1 & 2 Open closed 4v Open Open Open pins 1 & 2 closed BUS SPEED CONFIGURATION CPU speed JP7 <= 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed