Differences Between Using APM 1.0 and APM 1.1 (119599)


The information in this article applies to:

  • Microsoft Windows 95
This article was previously published under Q119599

SUMMARY

Windows 95 is designed to function with advanced power management (APM) enabled computers. Some computers conform to the APM specification 1.0; others use APM 1.1. Although Windows 95 works with both specifications, there are advantages to using APM 1.1.

MORE INFORMATION

Windows 95's functionality improves with APM 1.1 because version 1.1 is designed to give the operating system more control over power management than APM 1.0 permitted. For example:
  • If a computer is using APM 1.1, the operating system can force the BIOS to wait (essentially indefinitely) until it has prepared the running programs and drivers for suspend mode.
  • If a computer is using APM 1.1, the operating system can reject the request for suspend mode.
The operating system does not have this control in APM 1.0. These features help stabilize the suspend function in a Windows 95/APM 1.1 environment.

Enhancements in APM 1.1 allow applications and system components to become more actively involved in the suspend/resume process. Windows 95 also queries the APM BIOS more thoroughly than previous versions of Windows by obtaining more accurate information regarding the power state and the remaining battery life. This is possible because APM 1.1 provides more accurate reporting of the remaining battery power and documents the specification more legibly than APM 1.0, helping to make power management more reliable.
Modification Type:MajorLast Reviewed:12/17/2000
Keywords:KB119599
©2002 Microsoft Corporation. All rights reserved.