Re: A86: _exec_basic

To: assembly-86@lists.ticalc.org
Subject: Re: A86: _exec_basic
From: Kirk Meyer <kmeyer@Mines.EDU>
Date: Thu, 2 Mar 2000 08:14:27 -0700 (MST)
In-Reply-To: <20000301.181824.-112039.0.rabidcow@juno.com>
Reply-To: assembly-86@lists.ticalc.org


It seems it should work, but it doesn't. _parseinp seems to mess with the
stack so that it bypasses the usual return. The syntax error is caused by
the PC for entry being changed by calling the _parseinp function. Clem's
post to the list may work to fix this (haven't tried it yet), but _jforce
isn't a bad aidea, for shells at least...

  Kirk

On Wed, 1 Mar 2000 rabidcow@juno.com wrote:

> 
> _PARSEINP uses __bank_call, which should return the proper rom page,
> right?
> _PARSEOFF does the same thing as _PARSEINP, except it doesn't reset some
> flags first.  does this one work?
> what causes the syntax error?
> 
> -josh
> 
> On Wed, 1 Mar 2000 17:35:03 -0700 "Kirk Meyer" <kirkmeyer@bigfoot.com>
> writes:
> > 
> > The mystery is finally solved. We were using the wrong ROM call. The 
> > call on
> > the 83+ is _parseinp (according to TI), so I searched TI's official
> > includes. There it was, _parseinp, location $4C57. Now we knew about 
> > $4C57
> > before, but it didn't switch back to ROM page $0D, so we thought it 
> > caused a
> > crash. So, just use this code to execute a BASIC program if the name 
> > is in
> > OP1:
> > 
> >      call $4c57
> >      ld   a,$0D
> >      out  (5),a
> > 
> > Also, you should flush the menus before executing if you haven't 
> > already:
> > 
> >      call $49dc
> > 
> > And you MUST exit your program through jforce:
> > 
> >      jp   $409c
> > 
> > (If you don't, nothing TOO bad should happen, but you will get an 
> > ERROR 07
> > SYNTAX)
> > 
> > I tested this with various programs, compiled and uncompiled, and it 
> > seems
> > to work all the time.
> > 
> > Kirk
> > 
> > 
> 
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References:

Re: A86: _exec_basic

From: rabidcow@juno.com