ATEN RESEARCH, INC. 486 LOCAL BUS MAINBOARD Processor 80486SX/80486DX/80486DX2 Processor Speed 20/25/33/50(internal)/50/66(internal)MHz Chip Set OPTI Max. Onboard DRAM 64MB Cache 64/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit local bus card slot NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location External battery J2 pins 1 & 4 Speaker J6 Turbo switch J3 Power LED & keylock J7 Reset switch J4 32-bit local bus S1 card Turbo LED J5 USER CONFIGURABLE SETTINGS Function Jumper Position » Battery type select internal J2 pins 2 & 3 closed Battery type select external J2 pins 1 & 4 connected » 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 » VGA card type select ISA JP3 pins 1 & 2 closed JP4 pins 1 & 2 closed VGA card type select local bus JP3 pins 2 & 3 closed with ET 4000 chipset JP4 pins 2 & 3 closed VGA card type select local bus JP3 pins 2 & 3 closed with S3 chipset JP4 pins 1 & 2 closed » I/O Bus speed select ATCLK/4 JP5 open I/O Bus speed select ATCLK/6 JP5 closed » CPU speed select iOSC/2 JP9 pins 2 & 3 closed CPU speed select iOSC/1 JP9 pins 1 & 2 closed CPU CONFIGURATION CPU Type JP6 JP7 JP8 80486DX2 pins 1 & 2 pins 2 & 3 closed closed closed 80486DX pins 1 & 2 pins 2 & 3 closed closed closed 80486SX pins 2 & 3 open open closed SRAM JUMPER CONFIGURATION Size JP10 JP11 JP12 JP13 64KB open open open open 256KB closed closed open closed SRAM CONFIGURATION Size Cache SRAM TAG (U46) TAG (U47) 64KB (8) 8K x 8 (1) 64K x 1 (1) 8K x 8 256KB (8) 32K x 8 (1) 64K x 1 (1) 32K x 8 Note:Locations of U46 and U47 are unknown. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (4) 256K x 9 NONE NONE NONE 2MB (4) 256K x 9 (4) 256K x 9 NONE NONE 3MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 NONE 4MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 5MB (4) 1M x 9 (4) 256K x 9 NONE NONE 6MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 NONE 7MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 NONE NONE 9MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 NONE 10MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 12MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 NONE 13MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 16MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE NONE NONE 20MB (4) 1M x 9 (4) 4M x 9 NONE NONE 24MB (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 NONE 28MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 NONE NONE 36MB (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 NONE 40MB (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 48MB (4) 4M x 9 (4) 4M x 9 (4) 4M x 9 NONE 52MB (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 (4) 4M x 9 64MB (4) 4M x 9 (4) 4M x 9 (4) 4M x 9 (4) 4M x 9