Subj : DosRead - access denied?
To   : Rob Basler
From : Vitus Jensen
Date : Tue Jun 13 2000 04:57 pm

Moin Rob,

12.06.00 22:45, Rob Basler wrote a message to Vitus Jensen:

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

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

You said "you can't open COM3".  This would be OK but I *can* open the port
successfully.  It's the read which fails!


Tsch��,
   Vitus

PS: it's a rockt port board from comtrol.
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