Microsoft KB Archive/71567

= OVLDOS21.OBJ Programs Can Also Run Under MS-DOS 3.x and 4.x =

Article ID: 71567

Article Last Modified on 8/16/2005

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APPLIES TO


 * Microsoft BASIC Professional Development System 7.1
 * Microsoft BASIC Professional Development System 7.0

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This article was previously published under Q71567



SUMMARY
The special file OVLDOS21.OBJ allows a Basic PDS program to make use of overlays under MS-DOS version 2.10 or later. If you don't link overlayed programs with OVLDOS21.OBJ, the overlays will work only under MS-DOS 3.00 or later.

This information is taken from page 18 of the &quot;Microsoft Basic 7.0: Getting Started&quot; manual.

The methods for loading overlays under MS-DOS 2.10 are different than the methods used under MS-DOS 3.00 or later. The file OVLDOS21.OBJ allows the Overlay Manager to handle these differences under MS-DOS 2.10, in addition to handling overlays under MS-DOS version 3.00 or later.

Additional query words: BasicCom

Keywords: KB71567

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