[A83] Re: im 2

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: im 2
From: "Henk Poley" <HPoley@DDS.nl>
Date: Sun, 9 Sep 2001 17:31:29 +0200
Reply-To: assembly-83@lists.ticalc.org


> Van: David Phillips <david@acz.org>
> 
> > > Because the calc wasn't designed for us programmers :)  They always
> > > use IM 1(which is only usable on the 86).  Having an IM 2 mode that
> > > works is just luck.
> >
> > Oh hey, so IM2 just can't work on the Ti86 you say? (on normal asm(
> startup
> > memory banks). I thought I've seen Ti-86 IM2 interrupt programs (one
that
> > don't use the TIOS hooks).
> 
> No, IM 1 only works on the 86.  IM 2 works as well, as on the other
> calculators.  IM 1 has the advantage of not taking up memory, and being
safe
> (no program can accidentally overwrite your vector table and crash the
> calc).

So you try to say with "IM 1 only works on the 86", that on the Ti86 you
can install a hook that is exected every time the TIOS-interrupt (IM1)
runs, and that the Ti86 is the only Ti-calc that has this kind of hook (or
is the TIOS-int just skipped when the 'hook' is installed)?

Hasn't the Ti83+ got such capabilities too?

	Henk Poley <><

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