Full Screen MS-DOS Application Runs Slowly (103406)
The information in this article applies to:
- Microsoft Windows NT Server 3.1
- Microsoft Windows NT Workstation 3.1
- Microsoft Windows NT Advanced Server 3.1
This article was previously published under Q103406 SYMPTOMS
At times, your graphical, MS-DOS-based application runs very slowly
in full-screen mode. You may notice this behavior is triggered by
switching the application between an icon and full screen state. Also,
if you press a key, the application speeds up for a short time.
CAUSE
The Windows NT virtual MS-DOS machine (VDM) enabled idle time
detection while the application was in full-screen mode. Because
Windows NT does not trap video activity while an MS-DOS - based
application is running in full-screen mode, it assumes the application
is idle and reduces its execution priority. The reason the application
speeds up when you press a key is that Windows NT detects keystrokes
at all times; when the activity is noted, the status of the
application is changed from idle to active.
RESOLUTION
If you experience this behavior, use PIF Editor to create a program
information file (PIF) for your application. In the Advanced Options
dialog box, disable Detect Idle Time under Multitasking Options.
| Modification Type: | Major | Last Reviewed: | 4/9/2004 |
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| Keywords: | kb3rdparty kbinterop KB103406 |
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