From Newsgroup: comp.sys.ibm.ps2.hardware

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

------------------------------------------------------------------------------- The information in this article applies to:

- Microsoft Windows 95 -------------------------------------------------------------------------------

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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