GIGA-BYTE TECHNOLOGY CO., LTD. GA-486IM Processor CX486/AM486/UMC/80486SX/80486DX/80486DX2/80486DX4/P24D/ 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 32/64/128/256/512/1024KB BIOS Award Dimensions 254mm x 218mm I/O 32-bit VESA local bus slots (2), 32-bit PCI slots (4), green PC Options connector NPU None Options [Image] CONNECTIONS Purpose Location Purpose Location Reset switch J2 Turbo LED JP24 Turbo switch J3 Green PC LED JP27 Speaker J4 Green PC connector JP28 Power LED & keylock J5 32-bit PCI slots PC1 - PC4 Green PC connector JP12 32-bit VESA local bus SL1 & SL2 slots USER CONFIGURABLE SETTINGS Function Jumper Position » P24D cache type select write JP6 pins 2 & 3 through closed P24D cache type select write JP6 pins 1 & 2 back closed » Factory configured - do not JP17 N/A alter » Factory configured - do not JP22 N/A alter DRAM CONFIGURATION Size Bank 0 Bank 1 2MB (2) 256K x 36 NONE 4MB (2) 512K x 36 NONE 4MB (2) 256K x 36 (2) 256K x 36 6MB (2) 256K x 36 (2) 512K x 36 6MB (2) 512K x 36 (2) 256K x 36 8MB (2) 512K x 36 (2) 512K x 36 8MB (2) 1M x 36 NONE 10MB (2) 256K x 36 (2) 1M x 36 10MB (2) 1M x 36 (2) 256K x 36 12MB (2) 512K x 36 (2) 1M x 36 12MB (2) 1M x 36 (2) 512K x 36 16MB (2) 1M x 36 (2) 1M x 36 16MB (2) 2M x 36 NONE 18MB (2) 256K x 36 (2) 2M x 36 18MB (2) 2M x 36 (2) 256K x 36 20MB (2) 512K x 36 (2) 2M x 36 20MB (2) 2M x 36 (2) 512K x 36 24MB (2) 1M x 36 (2) 2M x 36 24MB (2) 2M x 36 (2) 1M x 36 32MB (2) 2M x 36 (2) 2M x 36 32MB (2) 4M x 36 NONE 34MB (2) 256K x 36 (2) 4M x 36 34MB (2) 4M x 36 (2) 256K x 36 36MB (2) 512K x 36 (2) 4M x 36 36MB (2) 4M x 36 (2) 512K x 36 40MB (2) 1M x 36 (2) 4M x 36 40MB (2) 4M x 36 (2) 1M x 36 48MB (2) 2M x 36 (2) 4M x 36 48MB (2) 4M x 36 (2) 2M x 36 64MB (2) 4M x 36 (2) 4M x 36 64MB (2) 8M x 36 NONE 66MB (2) 256K x 36 (2) 8M x 36 66MB (2) 8M x 36 (2) 256K x 36 68MB (2) 512K x 36 (2) 8M x 36 68MB (2) 8M x 36 (2) 512K x 36 72MB (2) 1M x 36 (2) 8M x 36 72MB (2) 8M x 36 (2) 1M x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 80MB (2) 2M x 36 (2) 8M x 36 80MB (2) 8M x 36 (2) 2M x 36 96MB (2) 4M x 36 (2) 8M 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 (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 JP19 JP20 JP21 JP26 128KB Open Open Closed pins 2 & 3 closed 256KB Open Closed Closed pins 1 & 2 closed 256KB Open Closed Closed pins 2 & 3 closed 512KB Closed Closed Closed pins 2 & 3 closed CPU TYPE CONFIGURATION Type JP3 JP16 Cyrix pins 1 & 2 closed N/A AMD pins 1 & 2 closed N/A UMC pins 1 & 2 closed N/A 80486SX N/A pins 2 & 3 closed 80486DX N/A pins 1 & 2 closed Intel pins 1 & 2 closed N/A Intel S-series pins 3 & 4 closed N/A CPU TYPE CONFIGURATION Type RN1 RN2 RN3 RN4 RN5 Cyrix Installed Not Not Installed Not installed installed installed AMD Not 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 JP1 JP13 Cyrix pins 1 & 2, 3 & 4 Open closed AMD pins 5 & 6, 7 & 8 Open closed UMC pins 5 & 6, 7 & 8 Open closed Intel pins 3 & 4, 5 & 6 Closed closed CPU SPEED CONFIGURATION Speed JP2 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 (80486DX4 ONLY) Speed JP4 JP23 2x Closed pins 2 & 3 closed 3x Open pins 2 & 3 closed BUS SPEED CONFIGURATION CPU speed JP25 <= 33MHz Open > 33MHz Closed VESA DELAY CONFIGURATION Setting JP7 JP15 Normal card installed pins 1 & 2 closed pins 1 & 2 closed Card installed needs address pins 2 & 3 closed pins 2 & 3 closed setup time