DELL COMPUTER CORPORATION Precision 486SX/25, Precision 486DX/33 Processor 80486SX/80487SX/80486DX Processor Speed 25/33MHz Chip Set OPTI Max. Onboard DRAM 32MB Cache 64/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location Reset switch J9 Speaker J21 External battery J18 Power LED & keylock J22 Turbo switch J20 Note:Although there is a 4167 socket on the board, it is not supported. (As per the manufacturer) USER CONFIGURABLE SETTINGS Function Jumper Position » Battery select internal W1 Closed Battery select external W1 Open » CMOS memory normal operation W2 pins 1 & 2 closed CMOS memory clear W2 pins 2 & 3 closed » CPU speed select ATCLK/4 W3 pins 2 & 3 closed CPU speed select ATCLK/6 W3 pins 1 & 2 closed » Factory configured - do not alter W8 Open » Factory configured - do not alter W9 Open » Factory configured - do not alter W10 Open » Monitor type select color W12 pins 1 & 2 closed Monitor type select monochrome W12 pins 2 & 3 closed » Factory test disabled W13 Open Factory test enabled W13 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 20MB (4) 4M x 9 (4) 256K x 9 32MB (4) 4M x 9 (4) 1M x 9 CACHE CONFIGURATION Size Bank 0 64KB (8) 8K x 8 256KB (8) 32K x 8 CACHE JUMPER CONFIGURATION Size W8 W9 W18 64KB pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 256KB pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed CPU TYPE CONFIGURATION Type W5 W6 W7 80486SX pins 2 & 3 pins 2 & 3 Open closed closed 80487SX pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 80486DX pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed