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Q128804: XGA/1 or XGA/2 Video Adapter Cannot Play Full-Screen .AVI File

Article: Q128804
Product(s): Microsoft Windows 95.x Retail Product
Version(s): 
Operating System(s): 
Keyword(s): 
Last Modified: 17-DEC-2000

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The information in this article applies to:

- Microsoft Windows 95 
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SYMPTOMS
========

When you start Windows 95 you do not see the Windows 95 logo screen, and you
cannot play full-screen .AVI files.

CAUSE
=====

The XGA/1 or XGA/2 video adapter that you are using does not support mode-X
video. The Windows logo screen and full-screen .AVI files are displayed using
mode X.


STATUS
======

This situation is most likely caused by design changes in Windows 95. Microsoft
has confirmed that it is not caused by a problem in Windows 95. For more
information about resolving this issue, contact the manufacturer of your video
adapter.

MORE INFORMATION
================

With mode-13h video, the addressing of pixels is done in a linear fashion. That
is, when you are accessing video memory with mode 13h, increasing a given
address by one byte results in the address of the next pixel in sequence. While
this type of addressing can be very effective for less complex tasks, it is not
as useful for more complex graphics applications.

In particular, you can address only one video page using mode 13h. As a result,
you can access only about 64K of video memory, which is not practical when you
are programming for modern display adapters that typically have 256K or more of
memory installed. To avoid this problem and other problems associated with mode
13h, programmers often use mode X instead. Mode X involves direct programming of
the VGA registers, which allows for greater flexibility and the ability to
address more memory.


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Keywords          :  
Technology        : kbWin95search kbZNotKeyword3

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