Compaq Deskpro EP 6233 - Page 7

Technical Reference Guide
Compaq Deskpro EP Series Personal Computers
First Edition – April 1998
v
5.4.1 RS-232 INTERFACE ................................................................................................... 5-15
5.4.2 SERIAL INTERFACE PROGRAMMING.................................................................... 5-16
5.5 PARALLEL INTERFACE................................................................................................... 5-21
5.5.1 STANDARD PARALLEL PORT MODE ..................................................................... 5-21
5.5.2 ENHANCED PARALLEL PORT MODE..................................................................... 5-22
5.5.3 EXTENDED CAPABILITIES PORT MODE............................................................... 5-22
5.5.4 PARALLEL INTERFACE PROGRAMMING.............................................................. 5-23
5.5.5 PARALLEL INTERFACE CONNECTOR ...................................................................5-27
5.6 KEYBOARD/POINTING DEVICE INTERFACE ...............................................................5-28
5.6.1 KEYBOARD INTERFACE OPERATION ................................................................... 5-28
5.6.2 POINTING DEVICE INTERFACE OPERATION .......................................................5-30
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING ......................... 5-30
5.6.4 KEYBOARD/POINTING DFEVICE INTERFACE CONNECTOR.............................. 5-34
5.7 UNIVERSAL SERIAL BUS INTERFACE........................................................................... 5-35
5.7.1 USB KEYBOARD CONSIDERATIONS...................................................................... 5-35
5.7.2 USB CONFIGURATION.............................................................................................. 5-35
5.7.3 USB CONTROL........................................................................................................... 5-36
5.7.4 USB CONNECTOR ..................................................................................................... 5-36
CHAPTER 6 POWER AND SIGNAL DISTRIBUTION.......................................................................
6.1 INTRODUCTION.................................................................................................................. 6-1
6.2 POWER SUPPLY ASSEMBLY/CONTROL..........................................................................6-1
6.2.1 POWER SUPPLY ASSEMBLY...................................................................................... 6-2
6.2.2 POWER CONTROL....................................................................................................... 6-3
6.3 POWER DISTRIBUTION...................................................................................................... 6-5
6.3.1 3/5/12 VDC DISTRIBUTION......................................................................................... 6-5
6.3.2 LOW VOLTAGE DISTRIBUTION................................................................................6-6
6.4 GENERAL SIGNAL DISTRIBUTION ..................................................................................6-7
CHAPTER 7 BIOS ROM .......................................................................................................................
7.1 INTRODUCTION.................................................................................................................. 7-1
7.2 BOOT FUNCTIONS..............................................................................................................7-2
7.2.1 BOOT BLOCK............................................................................................................... 7-2
7.2.2 QUICKBOOT.................................................................................................................7-2
7.2.3 SILENTBOOT ............................................................................................................... 7-2
7.3 MEMORY DETECTION AND CONFIGURATION..............................................................7-3
7.4 CLIENT MANAGEMENT SUPPORT................................................................................... 7-4
7.4.1 SYSTEM ID/REVISION/SERIAL NO. .......................................................................... 7-6
7.4.2 SYSTEM INFORMATION TABLE............................................................................... 7-6
7.4.3 EDID RETRIEVE........................................................................................................ 7-12
7.4.4 DRIVE FAULT PREDICTION..................................................................................... 7-12
7.4.5 SYSTEM MAP RETRIEVAL....................................................................................... 7-13
7.4.6 FLASH ROM FUNCTIONS......................................................................................... 7-14
7.4.7 POWER BUTTON FUNCTIONS................................................................................. 7-14
7.4.8 ACCESSING CMOS.................................................................................................... 7-16