DELL COMPUTER CORPORATION System 486D Processor 80486SX/80487SX/80486DX Processor Speed 16/20/25/33 Chip Set VLSI Max. Onboard DRAM 64MB Cache None BIOS AMI Dimensions 329mm x 334mm I/O Options Bus mouse, floppy interface, IDE interface, parallel port, serial ports (2), VGA port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port CN1 External battery JBAT Parallel port CN2 Cooling fan JFAN Serial port 2 CN3 VGA pass-through JFEAT Serial port 1 CN4 Primary floppy drive JFLOP interface Bus mouse port CN5 IDE interface JIDE Board ground GND Front panel status JVIEW points LCD IDE interface LED JLED USER CONFIGURABLE SETTINGS Function Jumper Position » Boot EEPROM select normal CLRB Open operation Boot EEPROM clear CLRB Closed » VGA interrupt request select none JP5 pins 1 & Open 2 VGA interrupt request select IRQ9 JP5 pins 1 & Closed 2 » Factory configured - do not alter JP5 pins 3 & Open 4 » Monitor type select color JP5 pins 5 & Closed 6 Monitor type select monochrome JP5 pins 5 & Closed 6 » Factory configured - do not alter JP5 pins 7 & Open 8 » Password check disabled JP5 pins 9 & Open 10 Password check enabled JP5 pins 9 & Closed 10 » Monitor type select standard VGA JP5 pins 11 Open & 12 Monitor type select Multifrequency JP5 pins 11 Closed (MultiSync) VGA & 12 » IOCHRDY wait state(s) disabled JP5 pins 17 Closed & 18 IOCHRDY wait state(s) enabled JP5 pins 17 Open & 18 » Boot source select normal (floppy JP5 pins 19 Open or hard drive) & 20 Boot source select Boot EEPROM on JP5 pins 19 Closed AT bus & 20 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 7MB (1) 1M x 36 (1) 256K x (1) 256K x (1) 256K x 36 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 13MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K x 36 16MB (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 DRAM CONFIGURATION (CON’T) Size Bank 0 Bank 1 Bank 2 Bank 3 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 19MB (1) 4M x 36 (1) 256K x (1) 256K x (1) 256K x 36 36 36 20MB (1) 4M x 36 (1) 1M x 36 NONE NONE 21MB (1) 4M x 36 (1) 1M x 36 (1) 256K x NONE 36 22MB (1) 4M x 36 (1) 1M x 36 (1) 256K x (1) 256K x 36 36 24MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 NONE 25MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 256K x 36 28MB (1) 4M x 36 (1) 1M x 36 (1) 1M x 36 (1) 1M x 36 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 37MB (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 (1) 256K x 36 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 49MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 256K x 36 52MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 1M x 36 64MB (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 (1) 4M x 36 CPU SPEED CONFIGURATION Speed JP1 JP2 JP3 JP4 16MHz Open Open Open Closed 20MHz Open Open Closed Open 25MHz Open Closed Open Open 33MHz Closed Open Open Open IOCHRDY CONFIGURATION Setting JP5 pins 13 & 14 Signal disabled to IDE drive(s) Closed Signal enabled to IDE drive(s) Open