ATEN RESEARCH, INC. 486DX/486SX CACHE MAINBOARD Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal)MHz Chip Set UNI Max. Onboard DRAM 128MB Cache 32/64/128/256KB BIOS Award Dimensions 330mm x 218mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery JP1 Turbo LED JP16 Reset switch JP14 Speaker JP17 Turbo switch JP15 Power LED & keylock JP18 USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP2 pins 1 & 2 closed CMOS memory clear JP2 pins 2 & 3 closed » CPU speed (external) select JP3 pins 1 & 2 16/20/25/33/40MHz closed CPU speed (external) select 50MHz JP3 pins 2 & 3 closed » Monitor type select color JP12 open Monitor type select monochrome JP12 closed CPU TYPE CONFIGURATION Jumper JP7 JP9 JP13 80486DX2 pins 1 & 2 pins 1 & 2 and 3 & 4 pins 1 & 2 closed closed closed 80486DX pins 1 & 2 pins 1 & 2 and 3 & 4 pins 1 & 2 closed closed closed 80487SX pins 2 & 3 pins 1 & 2 and 3 & 4 pins 1 & 2 closed closed closed 80486SX open pins 2 & 3 closed pins 2 & 3 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) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 64MB (4) 16M x 9 NONE 128MB (4) 16M x 9 (4) 16M x 9 SRAM JUMPER CONFIGURATION Jumper 32KB 64KB 128KB 256KB JP22 pins 2 & 3 pins 2 & 3 pins 2 & 3 pins 1 & 2 closed closed closed closed JP23 pins 2 & 3 pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed closed JP25 pins 1 & 2 pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed closed JP26 pins 2 & 3 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed closed JP27 closed open open open JP28 open closed open open JP29 open open closed open JP30 open open open closed SRAM CONFIGURATION Size Cache SRAM Location TAG 32KB (4) 8K x 8 Bank 0 (1) 8K x 8 64KB (8) 8K x 8 Banks 0 & 1 (1) 8K x 8 128KB (4) 32K x 8 Bank 0 (1) 32K x 8 256KB (8) 32K x 8 Banks 0 & 1 (1) 32K x 8