ABIT COMPUTER CORPORATION 486 VESA AG4 Processor CX486SX/80486SX/80487SX/CX486DX/80486DX/80486DX2/Pentium Overdrive Processor 20/25/33/40(internal)/50(internal)/50/66(internal)/75(internal)/83(internal)/ Speed 100(internal)MHz Chip Set SIS Max. 128MB Onboard DRAM Cache 128/256/512KB BIOS AMI/Award Dimensions 260mm x 220mm I/O 32-bit VESA local bus slots (3), green PC connector Options NPU None Options CONNECTIONS Purpose Location Purpose Location External battery J1 Reset switch J6 Turbo switch J3 Power LED & keylock J7 Turbo LED J4 Green PC connector JP45 Speaker J5 32-bit VESA Local bus SL1 - SL3 slots USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not J2 Open alter » Turbo mode enabled J3 pins 2 & 3 closed Turbo mode disabled J3 pins 1 & 2 closed » CMOS memory normal operation JP16 pins 1 & 2 closed CMOS memory clear JP16 pins 2 & 3 closed » Monitor type select color JP17 Closed Monitor type select monochrome JP17 Open » Enter break switch JP19 pins 1 & 2 closed Leave break switch JP19 pins 2 & 3 closed » Factory configured - do not JP23 pins 1 & 2 alter closed » Suspend mode disabled JP26 Open Suspend mode enabled JP26 Closed » Factory configured - do not JP30 Open alter » Factory configured - do not JP31 Open alter » Factory configured - do not JP42 Closed alter Note: The location of JP23 & JP26 is unidentified. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 1MB NONE NONE (1) 256K x 36 1MB (4) 256K x 9 NONE NONE 2MB NONE (1) 256K x 36 (1) 256K x 36 2MB NONE NONE (1) 512K x 36 2MB (4) 256K x 9 NONE (1) 256K x 36 4MB NONE NONE (1) 1M x 36 4MB NONE (1) 512K x 36 (1) 512K x 36 4MB (4) 1M x 9 NONE NONE 5MB NONE (1) 1M x 36 (1) 256K x 36 5MB (4) 256K x 9 NONE (1) 1M x 36 6MB (4) 1M x 9 (1) 256K x 36 (1) 256K x 36 6MB NONE (1) 1M x 36 (1) 512K x 36 6MB (4) 256K x 9 (1) 1M x 36 (1) 256K x 36 8MB (4) 1M x 9 (1) 512K x 36 (1) 512K x 36 8MB NONE (1) 1M x 36 (1) 1M x 36 8MB NONE NONE (1) 2M x 36 8MB (4) 1M x 9 NONE (1) 1M x 36 10MB (4) 256K x 9 (1) 2M x 36 (1) 256K x 36 12MB (4) 1M x 9 NONE (1) 2M x 36 12MB (4) 1M x 9 (1) 1M x 36 (1) 1M x 36 16MB NONE (1) 2M x 36 (1) 2M x 36 16MB NONE NONE (1) 4M x 36 16MB (4) 1M x 9 (1) 2M x 36 (1) 1M x 36 16MB (4) 1M x 9 (1) 1M x 36 (1) 2M x 36 17MB NONE (1) 4M x 36 (1) 256K x 36 17MB (4) 256K x 9 NONE (1) 4M x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 18MB (4) 4M x 9 (1) 256K x 36 (1) 256K x 36 18MB NONE (1) 4M x 36 (1) 512K x 36 18MB (4) 256K x 9 (1) 4M x 36 (1) 256K x 36 20MB (4) 4M x 9 (1) 512K x 36 (1) 512K x 36 20MB NONE (1) 4M x 36 (1) 1M x 36 24MB (4) 4M x 9 (1) 1M x 36 (1) 1M x 36 24MB (4) 1M x 9 (1) 4M x 36 (1) 1M x 36 32MB NONE (1) 4M x 36 (1) 4M x 36 32MB NONE NONE (1) 8M x 36 32MB (4) 4M x 9 NONE (1) 4M x 36 36MB (4) 4M x 9 (1) 4M x 36 (1) 1M x 36 36MB NONE (1) 8M x 36 (1) 1M x 36 36MB (4) 1M x 9 NONE (1) 8M x 36 36MB (4) 1M x 9 (1) 4M x 36 (1) 4M x 36 40MB (4) 1M x 9 (1) 8M x 36 (1) 1M x 36 48MB NONE (1) 8M x 36 (1) 4M x 36 48MB (4) 4M x 9 NONE (1) 8M x 36 48MB (4) 4M x 9 (1) 4M x 36 (1) 4M x 36 64MB NONE (1) 8M x 36 (1) 8M x 36 64MB NONE NONE (1) 16M x 36 64MB (4) 4M x 9 (1) 4M x 36 (1) 8M x 36 64MB (4) 16M x 9 NONE NONE 64MB (4) 4M x 9 (1) 8M x 36 (1) 4M x 36 64MB (4) 16M x 9 NONE NONE 65MB NONE (1) 16M x 36 (1) 256K x 36 65MB (4) 256K x 9 NONE (1) 16M x 36 68MB NONE (1) 16M x 36 (1) 1M x 36 72MB (4) 16M x 9 (1) 1M x 36 (1) 1M x 36 72MB (4) 1M x 9 (1) 16M x 36 (1) 1M x 36 80MB NONE (1) 16M x 36 (1) 4M x 36 80MB (4) 4M x 9 NONE (1) 16M x 36 96MB (4) 16M x 9 (1) 4M x 36 (1) 4M x 36 128MB NONE (1) 16M x 36 (1) 16M x 36 128MB (4) 16M x 9 NONE (1) 16M x 36 DRAM JUMPER CONFIGURATION Bank 0 Bank 1 Bank 2 JP33 JP34 JP35 SIMM 1-4 SIMM 6 SIMM 5 Open 1 & 2 Open (S) (S) SIMM 1-4 SIMM 6 SIMM 5 Open 1 & 2 Closed (D) (S) SIMM 1-4 SIMM 6 SIMM 5 2 & 3 1 & 2 Open (S) (D) SIMM 6 (S) SIMM 5 SIMM 1-4 1 & 2 2 & 3 Open (S) SIMM 6 (D) SIMM 5 SIMM 1-4 1 & 2 2 & 3 Open (D) SIMM 6 (D) SIMM 5 NONE 1 & 2 2 & 3 Open (S) SIMM 6 (D) SIMM 5 SIMM 1-4 1 & 2 2 & 3 Open (D) Note:Pins designated should be in the closed positon. DRAM JUMPER CONFIGURATION (CON’T) Bank 0 Bank 1 Bank 2 JP36 JP37 JP38 SIMM 1-4 SIMM 6 SIMM 5 2 & 3 Open 2 & 3 (S) (S) SIMM 1-4 SIMM 6 SIMM 5 2 & 3 2 & 3 Open (D) (S) SIMM 1-4 SIMM 6 SIMM 5 2 & 3 Open 2 & 3 (S) (D) SIMM 6 (S) SIMM 5 SIMM 1-4 1 & 2 1 & 2 1 & 2 (S) SIMM 6 (D) SIMM 5 SIMM 1-4 1 & 2 1 & 2 1 & 2 (D) SIMM 6 (D) SIMM 5 NONE 1 & 2 1 & 2 1 & 2 (S) SIMM 6 (D) SIMM 5 SIMM 1-4 1 & 2 1 & 2 1 & 2 (D) Note:Pins designated should be in the closed positon. 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) 64K x 8 (4) 64K x 8 (1) 32K x 8 512KB (4) 128K x 8 NONE (1) 32K x 8 CACHE JUMPER CONFIGURATION Size JP1 JP2 JP4 JP40 JP41 128KB 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 256KB 2 & 3 2 & 3 1 & 2 2 & 3 1 & 2 256KB 1 & 2 2 & 3 1 & 2 1 & 2 1 & 2 512KB 2 & 3 2 & 3 2 & 3 2 & 3 2 & 3 512KB 1 & 2 2 & 3 2 & 3 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type JP8 JP9 JP10 JP11 JP12 JP13 JP14 JP15 CX486SX 2 & Open 2 & Open 2-3, Open 1-2, 2 & 3 3 3 4-5 3-4 486SX 2 & Open 2 & Open Open Open Open Open 3 3 486SL 1 & Closed 2 & 2 & 3 & Open 2 & 4 & 5 2 3 3 4 3 CX486DX 1 & Closed 2 & 2 & 2 & Open 1-2, 2 & 3 2 3 3 3 3-4 486DX/DX2 1 & Closed 2 & 2 & Open Open Open Open 2 3 3 486DX4 1 & Closed 2 & 2 & 3 & Open 2 & 4 & 5 2 3 3 4 3 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION (CON’T) Type JP21 JP22 JP24 JP25 JP46 JP48 JP50 CX486SX 1 & 2 2 & 3 2 & 3 2 & 3 1 & 2 2 & 3 2 & 3 486SX 2 & 3 1 & 2 1 & 2 Open 2 & 3 2 & 3 2 & 3 486SL 2 & 3 1 & 2 Open Open 2 & 3 2 & 3 2 & 3 CX486DX 1 & 2 2 & 3 2 & 3 2 & 3 1 & 2 2 & 3 2 & 3 486DX/DX2 2 & 3 1 & 2 1 & 2 Open 2 & 3 2 & 3 2 & 3 486DX4 2 & 3 1 & 2 Open Open 2 & 3 1 & 2 1 & 2 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION Speed JP5 JP6 JP7 JP20 JP32 JP47 JP49 JP51 20MHz Closed Open Closed 1 & Closed Open Open Open 2 25MHz Closed Closed Open 1 & Closed Open Open Open 2 33MHz Open Closed Closed 1 & Closed Open Open Open 2 40MHz Closed Open Open 2 & Closed Open Open Open 3 50iMHz Closed Closed Open 1 & Closed Open Open Open 2 50MHz Open Open Closed 1 & Closed Open Open Open 2 66iMHz Open Closed Closed 1 & Closed Open Open Open 2 Note: Pins designated should be in the closed position. CPU SPEED CONFIGURATION (DX4 ONLY) Speed JP5 JP6 JP7 JP20 JP32 JP47 JP49 JP51 25/75MHz Closed Closed Open 1 & Open 2 & 1 & Open 2 3 2 33/83MHz Open Closed Closed 1 & Open 2 & Open Closed 2 3 33/100MHz Open Closed Closed 1 & Open 1 & 1 & Open 2 2 2 50/100MHz Open Open Closed 1 & Open 1 & 2 & Open 2 2 3 Note: Pins designated should be in the closed position. VESA WAIT STATE CONFIGURATION Wait states JP28 0 wait states pins 1 & 2 closed 1 wait state pins 2 & 3 closed VESA BUS SPEED CONFIGURATION CPU speed JP29 < = 33MHz pins 1 & 2 closed > 33MHz pins 2 & 3 closed GREEN PC CONFIGURATION Description JP45 Control video HSYNC pin 1 Ground pin 2 Control video VSYNC pin 3 Ground pin 4 Control ENVIDEO pin 5 Ground pin 6 Monitor AC power pin 7 Ground pin 8