COMPAQ COMPUTER CORPORATION PRESARIO 400 SERIES Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set Compaq Max. Onboard 16MB DRAM Cache None BIOS AMI Dimensions 330mm x 218mm I/O Options Riser card, floppy drive interface, game port, IDE interface, parallel port, PS/2 mouse port, serial port NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location PS/2 mouse port CN1 Power LED & keylock J2 Serial port CN2 Floppy drive interface J3 Parallel port CN3 Speaker J13 Game port CN4 External battery J16 Modem ports CN5 Riser Card SL1 IDE interface J1 USER CONFIGURABLE SETTINGS Function Jumper Position » CPU type select PGA P2 pins 2 & 3 closed CPU type select PQFP P2 pins 1 & 2 closed » CMOS memory normal operation P6 Open CMOS memory clear P6 Closed » Modem ROM select internal P7 pins 1 & 2 closed Modem ROM select external P7 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (1) 256K x 36 NONE 2MB (1) 256K x 36 (1) 256K x 36 2MB (1) 512K x 36 NONE 3MB (1) 256K x 36 (1) 512K x 36 4MB (1) 512K x 36 (1) 512K x 36 4MB (1) 1M x 36 NONE 5MB (1) 256K x 36 (1) 1M x 36 6MB (1) 512K x 36 (1) 1M x 36 8MB (1) 1M x 36 (1) 1M x 36 8MB (1) 2M x 36 NONE 9MB (1) 256K x 36 (1) 2M x 36 10MB (1) 512K x 36 (1) 2M x 36 12MB (1) 1M x 36 (1) 2M x 36 16MB (1) 2M x 36 (1) 2M x 36 CPU TYPE CONFIGURATION Type P3 P4 P5 80486SX (PQFP) pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 80486SX (PGA) pins 2 & 3 pins 2 & 3 pins 3 & 4 closed closed closed 80487SX pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed ODP486SX pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 80486DX pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 80486DX2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed CPU SPEED CONFIGURATION Speed P1 25MHz pins 1 & 2 closed 33MHz pins 2 & 3 closed 50iMHz pins 1 & 2 closed 66iMHz pins 2 & 3 closed MISCELLANEOUS TECHNICAL NOTE The purpose of CN6 is unknown.