Qmodem Reboots the Machine in Enhanced Mode

Last reviewed: November 23, 1994
Article ID: Q58297
The information in this article applies to:
  • Microsoft Windows operating system versions 3.0, 3.0a, 3.1, 3.11

SYMPTOMS

When you are using the Forbin Project Qmodem versions 4.0 and 4.5 MS-DOS communications program under Microsoft Windows 3.0 or 3.1 in 386 enhanced mode, the system reboots.

CAUSE

This problem occurs because Qmodem 4.0 and 4.5 attempt to use expanded memory, but do not check for an error return when obtaining the LIM 3.2 expanded memory page frame address. On machines where no LIM 3.2 compatible page frame is available, Windows returns an error. Qmodem ignores the error, and attempts to map data into a nonexistent expanded memory page frame address.

WORKAROUND

To work around the problem, do one of the following:

  • Create a .PIF file that specifies a 0 (zero) limit for EMS memory in the Advanced Options dialog box; this disables EMS for the MS-DOS command prompt under Windows, which allows Qmodem to run properly.
  • Rearrange hardware adapters in the machine to free a 64K contiguous area in the upper memory area (UMA) (the area from A000 to EFFF hexadecimal).


KBCategory: kb3rdparty
KBSubcategory: win30 win31
Additional reference words: 3.00 3.0 3.0a 3.00a 3.1 lite light 3.10 3.11
Win30 win31


THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: November 23, 1994
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.