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Microsoft KB Archive/104542

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Knowledge Base

MemMaker Doesn't Load ATDOSHC2.SYS or ATDOSXL.SYS High

Article ID: 104542

Article Last Modified on 11/21/1999


  • Microsoft MS-DOS 6.2 Standard Edition
  • Microsoft MS-DOS 6.21 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q104542


If you use a Hardcard (and the device driver ATDOSHC2.SYS or ATDOSXL.SYS), MS-DOS 6.2 and later MemMaker may not optimize your memory as well as MS- DOS 6.0 MemMaker does.


The MS-DOS 6.2 and later MEMMAKER.INF file supports the caret (^) character, which indicates MemMaker should move the program following the caret to the top of the CONFIG.SYS file. This program is then loaded into memory before HIMEM.SYS and EMM386.EXE (and therefore not loaded into upper memory).

The MS-DOS 6.2 and later MEMMAKER.INF file includes ^ATDOSHC2 and ^ATDOSXL, which prevent the ATDOSHC2.SYS and ATDOSXL.SYS drivers from being loaded in upper memory.


If you don't boot your system from the Hardcard, you can safely load ATDOSHC2.SYS or ATDOSXL.SYS into upper memory. To do this:

  1. Use a text editor (such as MS-DOS Editor) to edit your MEMMAKER.INF file and remove the caret symbols from the ^ATDOSHC2 and ^ATDOSXL lines.
  2. Save the MEMMAKER.INF file and exit the text editor.
  3. Run MemMaker.

Additional query words: 6.22 6.20 hard card

Keywords: KB104542