Microsoft KB Archive/197538

= Full-screen DOS Window Is Split with Some Number 9 Video Cards =

Article ID: 197538

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q197538



SYMPTOMS
Starting a full-screen command prompt on some Number Nine video adapters may result in a split-screen doubling of the full screen.



CAUSE
Vga.sys needs to set the character cell height for the MS-DOS mode. Character cell height is held in the lower 5 bits of the VGA register CR9. However, Vga.sys destroys the upper 3 bits of CR9 when writing the character cell height into the lower 5 bits of the register. The state of one of those upper three bits is required by the flat-panel MS-DOS mode.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack

If obtaining the service pack at this time is not a viable alternative, you can contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

The English version of this fix should have the following file attributes or later:

  Date      Time                 Size    File Name     Platform -  10/27/98  11:08a                14,704 Vga.sys       (x86) 10/27/98 11:08a                22,832 Vga.sys       (Alpha)



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Additional query words: 4.00 #9 Number 9 video card display adapter

Keywords: kbbug kbfix kbqfe KB197538

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