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

This article was previously published under Q197538
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Starting a full-screen command prompt on some Number Nine video adaptersmay result in a split-screen doubling of the full screen.
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 thecharacter cell height into the lower 5 bits of the register. The state ofone of those upper three bits is required by the flat-panel MS-DOS mode.
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 theMicrosoft 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, youcan contact Microsoft Product Support Services to obtain the fix. For acomplete list of Microsoft Product Support Services phone numbers andinformation on support costs, please go to the following address on theWorld Wide Web:

The English version of this fix should have the following file attributesor 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)				

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.
4.00 #9 Number 9 video card display adapter

Article ID: 197538 - Last Review: 11/02/2013 22:04:00 - Revision: 3.0

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

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