Problems When Using LapLink Pro 4.0A in 386 Enhanced Mode

 Last reviewed: November 22, 1994
Article ID: Q91631
The information in this article applies to:
  • Microsoft Windows operating system versions 3.1, 3.11

SUMMARY

The README.TXT file included with LapLink Pro version 4.0A, an MS-DOS-based application manufactured by Traveling Software, recommends not running LapLink under Microsoft Windows. This file also states that LapLink Pro 4.0A can function in 386 enhanced mode if you comment out the lines Device=*VCD and Device=*Combuff in the SYSTEM.INI file to disable the virtual communications driver (VCD) and virtual communications buffer (Combuff). To comment out these line, place a semicolon at the beginning of each line as follows: 

   ;Device=*VCD
   ;Device=*Combuff
Running Windows 3.1 with these lines disabled can cause problems when you are running other applications that use the COM ports. Microsoft does not support this workaround supplied by Traveling Software.

MORE INFORMATION

In 386 enhanced mode, the VCD allows multiple applications to access COM port hardware at the same time. The VCD notifies virtual machines (VMs) when their COM ports require servicing. Combuff buffers data between the communications driver and physical port. This prevents multitasking applications from losing data when they do not currently have CPU time.

If you run LapLink Pro 4.0A in 386 enhanced mode by making the aforementioned changes, your mouse response may become jumpy and your system may stop responding (hang).

LapLink Pro is manufactured by Traveling Software, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

KBCategory: kbreadme kb3rdparty
KBSubcategory: win31
Additional reference words: 3.10 jumps freezes frozen hung enable

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Last reviewed: November 22, 1994
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