Path: utzoo!attcan!uunet!samsung!munnari.oz.au!metro!macuni!sunc!ddavidso
From: ddavidso@sunc.mqcc.mq.oz.au (Dean Davidson)
Newsgroups: comp.lang.pascal
Subject: Re: I/O Port weirdness
Message-ID: <576@macuni.mqcc.mq.oz>
Date: 3 Oct 90 15:10:09 GMT
References: <14401@hydra.gatech.EDU>
Sender: news@macuni.mqcc.mq.oz
Organization: Macquarie University, Sydney
Lines: 29

In article <14401@hydra.gatech.EDU> bb16@prism.gatech.EDU (Scott Bostater) writes:
>I've run into a problem/bug with TP IDE and the use of I/O ports.  I'm trying
>to read from an I/O port. Sometimes it works, sometimes it doesn't. 
>
>Program Test;
>
>var
>  a: Byte;
>
>Begin
>  a := Port[$300];
>  Writeln( 'a = ', a);
>End.
>
I've had this sort of problem - in particular using Turbo Asynch in the IDE

I put it down to the fact that there is probably a clash of interupts
or interupts are disabled and not re-enabled or something

It was particularly noticable if you traced right into the routine

I just learned to live with it !


--
Dean Davidson                                 ddavidso@mqccsuna.mqcc.mq.oz.au
User Support                                  Phone 61 2 805 7436
Macquarie University                          Fax   61 2 805 7433
NSW 2109 Australia                            VK2 ZID