Compaq 850 manual Parallel Interface Connector

Technical Reference Guide

CHAPTER 4 SYSTEM SUPPORT
4.1	INTRODUCTION		4-1
4.2	PCI BUS OVERVIEW		4-2
4.2.1		PCI BUS TRANSACTIONS	4-3
4.2.2 PCI BUS MASTER ARBITRATION			4-6
4.2.3		OPTION ROM MAPPING	4-7
4.2.4		PCI INTERRUPTS	4-7
4.2.5 PCI POWER MANAGEMENT SUPPORT			4-7
4.2.6		PCI SUB-BUSSES	4-7
4.2.7		PCI CONFIGURATION	4-8
4.2.8		PCI CONNECTOR	4-9
4.3	AGP BUS OVERVIEW		4-10
4.3.1		BUS TRANSACTIONS	4-10
4.3.2		AGP CONFIGURATION	4-13
4.3.3		AGP CONNECTOR	4-14
4.4	SYSTEM RESOURCES		4-15
4.4.1		INTERRUPTS	4-15
4.4.2		DIRECT MEMORY ACCESS	4-19
4.5	SYSTEM CLOCK DISTRIBUTION		4-20
4.6	REAL-TIME CLOCK AND CONFIGURATION MEMORY		4-20
4.6.1		CLEARING CMOS	4-21
4.6.2 CMOS ARCHIVE AND RESTORE			4-22
4.6.3		STANDARD CMOS LOCATIONS	4-22
4.7	SYSTEM MANAGEMENT		4-31
4.7.1		SECURITY FUNCTIONS	4-31
4.7.2		POWER MANAGEMENT	4-32
4.7.3		SYSTEM STATUS	4-33
4.7.4 TEMPERATURE SENSING AND COOLING			4-34
4.8	REGISTER MAP AND MISCELLANEOUS FUNCTIONS		4-35
4.8.1		SYSTEM I/O MAP	4-35
4.8.2 82801 ICH GENERAL PURPOSE FUNCTIONS			4-36
4.8.3		I/O CONTROLLER FUNCTIONS	4-37
CHAPTER 5 INPUT/OUTPUT INTERFACES
5.1	INTRODUCTION		5-1
5.2	ENHANCED IDE INTERFACE		5-1
5.2.1		IDE PROGRAMMING	5-1
5.2.2		IDE CONNECTOR	5-3
5.3	DISKETTE DRIVE INTERFACE		5-4
5.3.1		DISKETTE DRIVE PROGRAMMING	5-5
5.3.2		DISKETTE DRIVE CONNECTOR	5-7
5.4	SERIAL INTERFACE		5-8
5.4.1		RS-232 INTERFACE	5-8
5.4.2		SERIAL INTERFACE PROGRAMMING	5-9
5.5	PARALLEL INTERFACE		5-11
5.5.1 STANDARD PARALLEL PORT MODE			5-11
5.5.2 ENHANCED PARALLEL PORT MODE			5-12
5.5.3 EXTENDED CAPABILITIES PORT MODE			5-12
5.5.4		PARALLEL INTERFACE PROGRAMMING	5-13
5.5.5		PARALLEL INTERFACE CONNECTOR	5-15

ivCompaq Deskpro EXS and Workstation 300 Personal Computers Featuring the Intel Pentium 4 Processor

First Edition –- December 2000