AIM MOTHERBOARD COMPANY 486 VESA Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal)MHz Chip Set UNI Max. Onboard DRAM128MB Cache 32/64/128/256KB BIOS AMI Dimensions 254mm x 218mm I/O Options 32-bit VESA local bus slots (3) NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J4 Turbo switch JP17 Power LED & keylock J5 32-bit VESA Local S1 bus slots Speaker J6 32-bit VESA Local S2 bus slots Reset switch JP18 32-bit VESA Local S3 bus slots Turbo LED JP16 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color JP1 Closed Monitor type select monochrome JP1 Open » CMOS memory normal operation JP2 pins 1 & 2 closed CMOS memory clear JP2 pins 2 & 3 closed » Factory configured - do not JP20 Closed alter » V-L bus clock select - normal JP43 pins 2 & 3 closed V-L bus clock select - adjusted JP43 pins 1 & 2 closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 5MB (4) 1M x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 17MB (4) 4M x 9 (4) 256K x 9 20MB (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 65MB (4) 16M x 9 (4) 256K x 9 68MB (4) 16M x 9 (4) 4M x 9 80MB (4) 16M x 9 (4) 4M x 9 128MB (4) 16M x 9 (4) 16M x 9 CPU TYPE CONFIGURATION Type JP4 JP19 JP44 80486SX pins 5 & 6 closed Open pins 2 & 3 closed 80487SX pins 2 & 3, 4 & 5, Open pins 2 & 3 6 & 7 closed closed 80486DX/33 pins 1 & 2, 4 & 5, Open pins 2 & 3 6 & 7 closed closed 80486DX/50 pins 1 & 2, 4 & 5, Closed pins 1 & 2 6 & 7 closed closed 80486DX2 pins 1 & 2, 4 & 5, Open pins 2 & 3 6 & 7 closed closed CPU SPEED CONFIGURATION Speed JP29 JP30 JP31 20MHz Open Closed Closed 25Mhz Closed Open Closed 33MHz Closed Closed Open 50i MHz Open Closed Open 50MHz Closed Open Closed 66i MHz Closed Closed Open CACHE JUMPER CONFIGURATION Size JP6 JP7 JP9 JP11 32KB Open Open Open pins 2 & 3 closed 64KB Open Closed Open pins 1 & 2 closed 128KB Open Closed Closed pins 1 & 2 and 3 & 4 closed 256KB Closed Closed Closed pins 1 & 2 and 4 & 5 closed VESA CONFIGURATION Setting JP40 JP41 JP42 V-L bus master Open Open Open V-L bus slave Closed Closed Closed