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Article #24868

#24868

From: JEMCCABE
Date: Mon, 09 Feb 1987 05:19

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Date: 9 February 87 00:16-EST
From: JEMCCABE@MTUS5
To: INFO-ATARI16@SCORE.STANFORD.EDU
Subject: BITNET mail follows

Real Subject: OSS Personal Pascal problems...

You may remember my posting a while back about having problems finding
a PEEK routine for Pascal.  Well, I found it but now, no matter what I
try with Personal Pascal, it won't let me access certain memory
locations.   The program stops when I try to access $FFFA01, even though
I am in supervisor mode.  I even have the pointer checking set off.
This problem is really beginning to bug me...  All I wanted to do was
monitor the DCD line...

I'm considering making an interrupt to set a flag when the DCD is there,
but I'd also need another interrupt that is executed BEFORE that one
that sets the flag to false, just in case that the DCD is low...
That would insure that the flag is always right.  The flag is set to
false by default, and then if the DCD is high the interrupt would
set the flag to true again.  I know how to set up my interrupt (MFP
interrupt 1) but I need another one that is always executed before
that one.

(But then again, if there is an easier way than an interrupt or
PEEKing $FFFA01, someone please tell me!)

                                 A depressed thanks...

                                         Jim McCabe
                                         JEMCCABE@MTUS5.BITNET

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