Description of Plug and Play Components within the HKEY_LOCAL_MACHINE\Enum\Bios Subkey (250534)


The information in this article applies to:

  • Microsoft Windows Millennium Edition
  • Microsoft Windows 98
  • Microsoft Windows 98 Second Edition
  • Microsoft Windows 95
This article was previously published under Q250534

SUMMARY

This article describes the Plug and Play subkey and the components of the following registry key in a Windows Me/98/95-based computer:

HKEY_LOCAL_MACHINE\Enum\Bios

MORE INFORMATION

The following subkey contains entries for Plug and Play components of the Basic Input/Output System (BIOS), including timers, controllers, DMA chips, and so on:

HKEY_LOCAL_MACHINE\Enum\Bios

The following list includes a value name, followed by an appropriate description: 

PNP0000-PNP0004	   Interrupt controllers

PNP0100-PNP0102	   System timers

PNP0200-PNP0202	   DMA controllers

PNP0300-PNP0313	   Keyboard controllers

PNP0400-PNP0401	   Printer ports

PNP0500-PNP0501	   Communication ports

PNP0600-PNP0602	   Hard disk controllers

PNP0700            Standard floppy disk controller

PNP0800            System speaker

PNP0900-PNP0915	   Display adapters
PNP0930-PNP0931
PNP0940-PNP0941

PNP0A00-PNP0A04	   Expansion buses

PNP0B00	           CMOS real-time clock

PNP0C01	           System board extension for Plug and Play BIOS

PNP0C02	           Reserved

PNP0C04	           Numeric data processor

PNP0E00-PNP0E02	   PCMCIA controllers

PNP0F01	           Serial Microsoft mouse

PNP0F00-PNP0F13	   Mouse ports

PNP8xxx	           Network adapters

PNPA030  	   Mitsumi CD-ROM controller

PNPB0xx	           Miscellaneous adapters


Plug and Play codes are grouped in classes according to their four-digit code. You can view and modify the device configuration used on your computer with Device Manager.

Detection and enumeration are the two processes that Windows uses to configure devices. Detection is the process Windows uses during its search for legacy or non-Plug and Play devices on a computer. Detection is used during Windows Setup and any time you use the Add New Hardware Wizard to search for new hardware installed in your computer. Detection does not run each time you start Windows. During the detection process, Windows creates a log file named Detlog.txt in the root folder of the boot drive. This file is commonly referenced when troubleshooting problems with hardware detection.

Enumeration is the process Windows uses to identify Plug and Play devices in your computer, including those devices on Plug and Play buses, such as ISAPNP, PCI, and PC Card (PCMCIA) devices. Enumeration occurs each time Windows starts and whenever Windows receives notification that a change has occurred in the computer hardware configuration, such as when you remove a PC Card.
Modification Type:MinorLast Reviewed:12/20/2004
Keywords:kbenv kbinfo KB250534
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