Compaq Deskpro 4000

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Technical Reference Guide

Compaq Deskpro 4000 and 6000 Personal Computers

featuring the Pentium II Processor

First Edition – October1997

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 DEVICE INTERFACE CONNECTOR................................ 5-34

5.7 ETHERNET INTERFACE...................................................................................................5-35

5.7.1 NIC CONFIGURATION/CONTROL ........................................................................... 5-36

5.7.2 NIC CONNECTORS.................................................................................................... 5-36

5.8 UNIVERSAL SERIAL BUS INTERFACE........................................................................... 5-37

5.8.1 USB CONFIGURATION.............................................................................................. 5-37

5.8.2 USB CONTROL........................................................................................................... 5-38

5.8.3 USB CONNECTOR ..................................................................................................... 5-38

5.9 ULTRA SCSI ADAPTER .................................................................................................... 5-39

5.9.1 SCSI CONNECTORS ................................................................................................. 5-40

CHAPTER 6 AUDIO SUBSYSTEM ......................................................................................................

6.1 INTRODUCTION.................................................................................................................. 6-1

6.2 FUNCTIONAL DESCRIPTION.............................................................................................6-2

6.2.1 PCM AUDIO PROCESSING.......................................................................................... 6-4

6.2.2 FM SYNTHESIS AUDIO PROCESSING....................................................................... 6-7

6.3 AUDIO SUBSYSTEM PROGRAMMING ............................................................................. 6-8

6.3.1 CONFIGURATION........................................................................................................ 6-8

6.3.2 CONTROL..................................................................................................................... 6-9

6.4 SPECIFICATIONS.............................................................................................................. 6-11

CHAPTER 7 POWER SUPPLY AND DISTRIBUTION.......................................................................

7.1 INTRODUCTION.................................................................................................................. 7-1

7.2 POWER SUPPLY ASSEMBLY/CONTROL.......................................................................... 7-1

7.2.1 POWER SUPPLY ASSEMBLY.....................................................................................7-2

7.2.2 POWER CONTROL.......................................................................................................7-3

7.3 POWER DISTRIBUTION......................................................................................................7-4

7.3.1 3.5/5/12 VDC DISTRIBUTION...................................................................................... 7-4

7.3.2 LOW VOLTAGE DISTRIBUTION................................................................................ 7-5

7.4 SIGNAL DISTRIBUTION..................................................................................................... 7-6

Compaq Deskpro 4000 - Page 7