Path: utzoo!attcan!uunet!husc6!uwvax!oddjob!ncar!gatech!purdue!decwrl!hplabs!cae780!leadsv!esl!dew
From: dew@esl.UUCP (Douglas Wood)
Newsgroups: comp.sys.atari.st
Subject: Re: Memory Access in Modula 2
Message-ID: <728@esl.UUCP>
Date: 1 Jul 88 19:25:36 GMT
References: <3188@druhi.ATT.COM>
Reply-To: dew@esl.UUCP (Douglas Wood)
Organization: ESL, Inc., Sunnyvale, CA.
Lines: 16

In article <3188@druhi.ATT.COM> terrell@druhi.UUCP (TerrellE) writes:
>Reading and writing from/to an absolute memory address in Modula 2:
>I know of a "dirty trick" to accomplish this in Pascal, which will probably work
>with Modula 2 as well.  It's based on the fact that variant records
>allow Pascal's normally strong typing to be circumvented.
...
<delete more comments and small program>

This is good, but there is one additional piece of information needed.
The original poster asked to access location $4ab.  One needs to be
in supervisor mode to do that.  In TDI Modula-2, one can not pass
parameters to a superexec'ed procedures, they must be global to the
procedure.  But, essentially, all that is needed is to peek and poke
while in supervisor mode with a structure essentially as written by terrel.

ames!esl!dew