DELL COMPUTER CORPORATION DIMENSION 486SX/25, 486DX/33, 486DX2/50 Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 25/33/50(internal)/50/66(internal) Chip Set OPTI Max. Onboard DRAM 64MB SRAM Cache 64/256KB (optional module) BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, bus mouse port parallel port, serial port (2), VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse J1 IDE interface LED J23 IDE interface J5 Reset switch J24 Floppy drive interface J6 Speaker J25 Parallel port J8 Power LED & keylock J26 Serial port (COM B) J9 VGA port J27 Serial port (COM A) J10 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color W1 pins 1 & 2 closed Monitor type select monochrome W1 pins 2 & 3 closed » CMOS memory normal operation W2 pins 1 & 2 closed CMOS memory clear W2 pins 2 & 3 closed » I/O bus speed select SYSCLK/2 W3 pins 2 & 3 closed I/O bus speed select SYSCLK/1 W3 pins 1 & 2 closed » On-board VGA enabled W10 pins 1 & 2 closed On-board VGA disabled W10 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 256K x NONE NONE NONE 36 2MB (1) 256K x (1) 256K x NONE NONE 36 36 3MB (1) 256K x (1) 256K x (1) 256K x NONE 36 36 36 4MB (1) 256K x (1) 256K x (1) 256K x (1) 256K x 36 36 36 36 4MB (1) 1M x 36 NONE NONE NONE 5MB (1) 1M x 36 (1) 256K x NONE NONE 36 6MB (1) 1M x 36 (1) 256K x (1) 256K x NONE 36 36 8MB (1) 1M x 36 (1) 1M x 36 NONE NONE 9MB (1) 1M x 36 (1) 1M x 36 (1) 256K x NONE 36 10MB (1) 1M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 12MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 NONE 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 16MB (1) 4M x 36 NONE NONE NONE 17MB (1) 4M x 36 (1) 256K x NONE NONE 36 18MB (1) 4M x 36 (1) 256K x (1) 256K x NONE 36 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 32MB (1) 4M x 36 (1) 4M x 36 NONE NONE 33MB (1) 4M x 36 (1) 4M x 36 (1) 256K x NONE 36 34MB (1) 4M x 36 (1) 4M x 36 (1) 256K x (1) 256K x 36 36 36MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 NONE 40MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 48MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 NONE 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 CPU TYPE CONFIGURATION CPU Jumper W6 Jumper W7 Jumper W8 80486DX2 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 80486DX pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 80487SX pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 80486SX pins 2 & 3 pins 2 & 3 open closed closed SRAM JUMPER CONFIGURATION Size Jumper W4 Jumper W5 Jumper W9 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 VIDEO SWITCH CONFIGURATION (SW1) Mode switch switch switch switch switch 5 1 2 3 4 56Hz vertical open open N/A N/A N/A refresh 60Hz vertical open closed N/A N/A N/A refresh 72Hz vertical closed open N/A N/A N/A refresh Enable interlaced N/A N/A open open N/A 60Hz non-interlaced N/A N/A open closed N/A 72Hz non-interlaced N/A N/A closed open N/A 31.5KHz horizontal N/A N/A N/A N/A open scan rate 40KHz horizontal N/A N/A N/A N/A closed scan rate VRAM CONFIGURATION Size VRAM SW1/switch 6 512KB (2) 256K x 4 closed 1MB (4) 256K x 4 open