GIGA-BYTE TECHNOLOGY CO., LTD. GA-486AM/AMS (REV. 2), GA-486AM/AMS (REV. 2.1) Processor CX486/AM486/UMC/SL80486SX/80486SX/SL80486DX/80486DX/ SL80486DX2/80486DX2/P24D/AM486DX4/80486DX4/Pentium Overdrive Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz Speed Chip Set UMC Max. 128MB Onboard DRAM Cache 128/256/512/1024KB BIOS Award Dimensions 250mm x 220mm I/O 32-bit PCI slots (3), floppy drive interface, green PC connector, Options IDE interfaces (2), parallel port, serial ports (2) NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location IDE interface 1 CN1 Speaker J3 IDE interface 2 CN2 Power LED & keylock J4 Floppy drive interface CN3 IDE interface LED JP1 Parallel port CN4 Turbo LED JP2 Serial port 2 CN5 Green PC connector JP3 Serial port 1 CN6 Green PC LED JP4 Reset switch J1 Green PC connector JP25 Turbo switch J2 32-bit PCI slots PC1 - PC3 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP14 Pins 1 & 2 alter closed » Factory configured - do not JP18 Pins 2 & 3 alter closed » Factory configured - do not JP19 Closed alter » Cache type select write through JP20 Closed Cache type select write back JP20 Open DRAM CONFIGURATION Size Bank 0 Bank 1 2MB (2) 256K x 36 NONE 4MB (2) 256K x 36 (2) 256K x 36 6MB (2) 512K x 36 (2) 256K x 36 8MB (2) 1M x 36 NONE 10MB (2) 1M x 36 (2) 256K x 36 12MB (2) 1M x 36 (2) 512K x 36 16MB (2) 2M x 36 NONE 18MB (2) 2M x 36 (2) 256K x 36 20MB (2) 2M x 36 (2) 512K x 36 24MB (2) 2M x 36 (2) 1M x 36 32MB (2) 4M x 36 NONE 34MB (2) 4M x 36 (2) 256K x 36 36MB (2) 4M x 36 (2) 512K x 36 40MB (2) 4M x 36 (2) 1M x 36 48MB (2) 4M x 36 (2) 2M x 36 64MB (2) 8M x 36 NONE 66MB (2) 8M x 36 (2) 256K x 36 68MB (2) 512K x 36 (2) 8M x 36 72MB (2) 8M x 36 (2) 1M x 36 80MB (2) 8M x 36 (2) 2M x 36 96MB (2) 8M x 36 (2) 4M x 36 128MB (2) 8M x 36 (2) 8M x 36 CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 128KB (4) 32K x 8 NONE (1) 8K x 8 256KB (A) (4) 32K x 8 (4) 32K x 8 (1) 16K x 8 256KB (B) (4) 64K x 8 NONE (1) 16K x 8 512KB (A) (4) 64K x 8 (4) 64K x 8 (1) 32K x 8 512KB (B) (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 JP24 JP26 128KB Open Pins 3 & 5 closed 256KB (A) Pins 1 & 2 closed Pins 1 & 3 closed 256KB (B) Pins 1 & 2 closed Pins 3 & 5 closed 512KB (A) Pins 1 & 2, 3 & 4 Pins 2 & 4 closed closed 512KB (B) Pins 1 & 2, 3 & 4 Pins 3 & 5 closed closed 1MB Pins 1 & 2, 3 & 4, 5 & Pins 4 & 6 closed 6 closed CPU TYPE CONFIGURATION Type RN1 RN2 RN3 RN4 RN5 Cyrix Installed Not Not Installed Not installed installed installed AMD Not Installed Not Not Installed installed installed installed UMC Not Not Installed Not Not installed installed installed installed Intel Not Installed Not Not Installed installed installed installed CPU TYPE CONFIGURATION Type JP8 All CPU types Pins 1 & 2 closed Intel S-series Pins 3 & 4 closed AMD S-series Pins 3 & 4 closed CPU TYPE CONFIGURATION Type JP9 All CPU types Closed AMD Open UMC Open CPU TYPE CONFIGURATION Type JP11 80486SX Pins 2 & 3 closed 80486DX Pins 1 & 2 closed CPU TYPE CONFIGURATION Type JP13 All CPU types Closed 80486DX4 Open CPU TYPE CONFIGURATION Type JP5 Cyrix Pins 1 & 2, 3 & 4 closed AMD Pins 3 & 4, 5 & 6 closed UMC Pins 5 & 6, 7 & 8 closed Intel Pins 3 & 4, 5 & 6 closed CPU SPEED CONFIGURATION Speed JP15 25MHz Pins 1 & 2 closed 33MHz Pins 1 & 2, 3 & 4, 5 & 6 closed 40MHz Pins 1 & 2, 3 & 4 closed 50iMHz Pins 1 & 2 closed 50MHz Pins 5 & 6 closed 66iMHz Pins 1 & 2, 3 & 4, 5 & 6 closed 75iMHz Pins 1 & 2 closed 100iMHz Pins 1 & 2, 3 & 4, 5 & 6 closed CPU SPEED CONFIGURATION (P24D & AM486DX4 ONLY) Speed JP12 2x Pins 2 & 3 closed 3x Pins 1 & 2 closed CPU SPEED CONFIGURATION (80486DX4 ONLY) Speed JP10 2x Closed 3x Open CPU VOLTAGE CONFIGURATION Processor Type Voltage JP22 JP23 Intel/AMD 3.3v Open Pins 1 & 2 closed Cyrix 3.3v Open Pins 2 & 3 closed Cyrix 4v Closed Pins 2 & 3 closed Intel/AMC/Cyrix/UMC 5v Open Pins 1 & 2 closed