From: firstname.lastname@example.org (Doug Cotton)
Subject: Re: JiffyDOS problem!
Date: Mon, 19 Feb 1996 22:05:18 -0500
> Magnus Nyman <email@example.com> wrote:
> >When Jiffy
> >loads the direcory (@$) it uses the vector bb/bc as a pointer to a
> >temporary buffer. Normally $9f01. The system uses the same vector as a
> >temporary storage for filenames after loading. (/,%,=A3... etc).
> >Load a ML-file from $1000 to $cfff, show the dir, and a part of your code
> >is corrupted!
There are a number of zero page locations used by JiffyDOS. These
locations are also used by the JiffyDOS kernal built into RAMLink and
RAMDrive. It is best to avoid using these locations in your own
programs in order to retain complete JiffyDOS compatibility. At the
very least, you should make sure that your use of them does not
interfere with JiffyDOS' usage.
JiffyDOS 64 Zero Page Variables
Location Variable Name Note
$26 allflag/rsize 2 $27 comsav 2 $9B keybyt 2 $9F cjla 2 $A3 ldflg/qflag 3 $A6 tflag 2 $B0/$B1 keyptr 2 $B0 sprsav 1 $B1 rassav 1 $B2 regsav 1 $BE drvbyt 2 $BF dest 2
$26 allflag/rsize 2 $27 comsav 2 $9F cjla 2 $A3 ldflg/qflag 3 $A6 tflag/togsav 2 $B0 sprsav 1 $B1 rassav 1 $B2 regsav 1 $BE drvbyt 2 $BF dest 2
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