ABIT COMPUTER CORPORATION 486 VESA/486 ISA Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 25/33/40/50(internal)/50/66(internal)MHz Chip Set UNI Max. Onboard DRAM32MB Cache 64/128/256KB BIOS AMI/Award Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2) [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock JW1 Reset switch JW5 Speaker JW2 External battery JP16 Turbo LED JW3 32-bit VESA local bus S1 & S2 slots Turbo switch JW4 USER CONFIGURABLE SETTINGS Function Jumper Position » Factory configured - do not JP1 Closed alter » Factory configured - do not JP2 Closed alter » Factory configured - do not JP3 pins 1 & 2 alter closed » Factory configured - do not JP9 Closed alter » Factory configured - do not JP10 Closed alter » Monitor type select monochrome JP11 pins 1 & 2 closed Monitor type select color JP11 pins 2 & 3 closed » Factory configured - do not JP12 Closed alter » Factory configured - do not JP14 Closed alter » CMOS memory normal operation JP15 pins 2 & 3 closed CMOS memory clear JP15 pins 1 & 2 closed » Factory configured - do not JP17 Closed alter » Factory configured - do not JP18 Closed alter » Factory configured - do not JP19 Closed alter » Factory configured - do not JP20 Closed alter » Factory configured - do not JP21 Closed alter » Factory configured - do not JP22 Closed alter » Factory configured - do not JP23 Closed alter » Factory configured - do not JP24 Closed alter » Factory configured - do not JPX4 Closed alter » Factory configured - do not JPX5 Closed alter 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 32MB (4) 4M x 9 (4) 4M x 9 CACHE CONFIGURATION Size Max Cachable Bank 0 Bank 1 TAG 64KB 8MB (4) 8K x 8 (4) 8K x 8 8K x 8 128KB 16MB (4) 32K x 8 NONE 8K x 8 256KB 32MB (4) 32K x 8 (4) 32K x 8 32K x 8 CACHE JUMPER CONFIGURATION Size JPX10 JPX20 JPX30 64KB Closed Open Open 128KB Open Closed Open 256KB Open Open Closed CPU SPEED CONFIGURATION Speed JP4 JP28 JP29 JP31 JP32 JP33 25MHz 1 & 2 1 & 2 1 & 2 Closed Open Closed 33MHz 1 & 2 1 & 2 1 & 2 Closed Closed Open 40MHz 2 & 3 2 & 3 2 & 3 Open Closed Closed 50iMHz 1 & 2 1 & 2 1 & 2 Closed Open Closed 50MHz 2 & 3 2 & 3 2 & 3 Closed Open Closed 66iMHz 1 & 2 1 & 2 1 & 2 Closed Closed Open NotePins designated should be in the closed position. CPU TYPE CONFIGURATION CPU Type JP5-JP8, JP25 JPX1 JPX2 JPX3 80486SX pins 1 & 2 Open Closed Closed closed 80487SX pins 1 & 2 Open Open Closed closed 80486DX, DX2 pins 1 & 2 Closed Open Open closed VESA WAIT STATE/BUS SPEED CONFIGURATION CPU speed Wait States JP26 JP27 < 33MHz O wait states pins 1 & 2 pins 1 & 2 closed closed > 33MHz 1 wait state pins 2 & 3 pins 2 & 3 closed closed