Subj : DosRead - access denied?
To   : Vitus Jensen
From : Rob Basler
Date : Mon Jun 12 2000 03:45 pm

VJ>Could someone name any reason why a DosRead() from a serial
VJ>port will return error code 5 (access denied)?  It's listed
VJ>as possible error code but i would connect it with
VJ>DosOpen().

This can fail if the port's assigned IRQ is in use by something else,
for example, with the default installation, COM1 and COM3 share the same
interrupt, so if you have a mouse on COM1, you can't open COM3.  Same
for COM2 and COM4.

Rob.
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