Microsoft KB Archive/74655

= Tandy 1000 TX Video Memory Uses the High Memory Area (HMA) =

Article ID: 74655

Article Last Modified on 11/16/2006

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APPLIES TO


 * Microsoft MS-DOS 5.0 Standard Edition
 * Microsoft MS-DOS 5.0a
 * Microsoft MS-DOS 6.0 Standard Edition
 * Microsoft MS-DOS 6.2 Standard Edition
 * Microsoft MS-DOS 6.21 Standard Edition
 * Microsoft MS-DOS 6.22 Standard Edition

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This article was previously published under Q74655



SYMPTOMS
When you try to load HIMEM.SYS on a Tandy 1000 TX, you receive the following error message:

VDISK Memory Allocator Already Installed: XMS Driver Not Installed.



CAUSE
The Tandy 1000 TX, an 80286 machine, uses the high memory area (HMA) for video memory. According to the Tandy Corporation, video memory is hard-wired to the A20 line. As a result, HIMEM.SYS does not load.

Third-party XMS memory managers also encounter a similar message.



MORE INFORMATION
The Tandy 1000 TX is manufactured by Tandy Corporation, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Additional query words: 6.22 5.00 5.00a 6.00 6.20 3rdparty 1000TX

Keywords: KB74655

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