Compaq EN Series manual - page 8

Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
v
5.5 PARALLEL INTERFACE................................................................................................... 5-20
5.5.1 STANDARD PARALLEL PORT MODE..................................................................... 5-20
5.5.2 ENHANCED PARALLEL PORT MODE..................................................................... 5-21
5.5.3 EXTENDED CAPABILITIES PORT MODE ...............................................................5-21
5.5.4 PARALLEL INTERFACE PROGRAMMING.............................................................. 5-22
5.5.5 PARALLEL INTERFACE CONNECTOR ...................................................................5-26
5.6 KEYBOARD/POINTING DEVICE INTERFACE...............................................................5-27
5.6.1 KEYBOARD INTERFACE OPERATION...................................................................5-27
5.6.2 POINTING DEVICE INTERFACE OPERATION.......................................................5-29
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING .........................5-29
5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR................................ 5-33
5.7 UNIVERSAL SERIAL BUS INTERFACE...........................................................................5-34
5.7.1 USB KEYBOARD CONSIDERATIONS......................................................................5-34
5.7.2 USB CONFIGURATION..............................................................................................5-34
5.7.3 USB CONTROL...........................................................................................................5-35
5.7.4 USB CONNECTOR..................................................................................................... 5-35
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 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......................................................................................................7-5
7.3.1 3.5/5/12 VDC DISTRIBUTION......................................................................................7-5
7.3.2 LOW VOLTAGE DISTRIBUTION................................................................................7-6
7.4 SIGNAL DISTRIBUTION..................................................................................................... 7-7
CHAPTER 8 BIOS ROM.......................................................................................................................
8.1 INTRODUCTION..................................................................................................................8-1
8.2 BOOT/RESET FUNCTIONS................................................................................................. 8-2
8.2.1 BOOT BLOCK...............................................................................................................8-2
8.2.2 QUICKBOOT.................................................................................................................8-2
8.2.3 SILENTBOOT ............................................................................................................... 8-2
8.2.4 RESET ........................................................................................................................... 8-2