Qmodem Reboots the Machine in Enhanced Mode (58297)
The information in this article applies to:
- Microsoft Windows 3.0
- Microsoft Windows 3.0a
- Microsoft Windows 3.1
- Microsoft Windows 3.11
This article was previously published under Q58297 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).
| Modification Type: | Minor | Last Reviewed: | 7/7/2005 |
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| Keywords: | KB58297 |
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