PRESARIO 400 SERIES Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Compaq
Max. Onboard DRAM	16MB
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

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 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486SX (PGA)	pins 2 & 3 closed	pins 2 & 3 closed	pins 3 & 4 closed
80487SX	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
ODP486SX	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 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

CN6 is used to connect to the internal 14" SVGA monitor on the unit.