Re: A86: Re: _exec_basic and _findAlphaUp
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Re: A86: Re: _exec_basic and _findAlphaUp
Is there any way to know ahead of time how much crap will be on the
stack?
Chris Phelps wrote:
>
> Cuz there is crap on the stack from the call _exec_basic, and anything else you
> have left there.
>
> > Does anyone have any idea as to WHY it crashes in the first place?
> >
> > Andreas Finne wrote:
> > >
> > > Yas, ase and Rascall use this method to run basic programs with some small
> > > differences. Also in the documentation to Rascall it says: "You should NOT
> > > start it with the command Asm(rascall) however, since the shell will then
> > > fail to execute BASIC programs!"
> > >
> > > Andreas Finne
> > > a_finne@hotmail.com
> > >
> > > >From: Cassady Roop <croop@oregontrail.net>
> > > >
> > > >and what happens if the user tries to run the shell from the actual
> > > >assembly program instead of the loader? Chaos? Great.
> > > >
> > > >
> > > >
> > > >Robin Kirkman wrote:
> > > > >
> > > > > It's a basic program that is run instead of the actual assembly code to
> > > > > start the shell.
> > > > >
> > > > > Example:
> > > > >
> > > > > ------------
> > > > > Lbl 1
> > > > > ::::::::
> > > > > Asm(ShelName)
> > > > > If Ans==1:Goto 1
> > > > > Return
> > > > > ------------
> > > > >
> > > > > The shell ShelName can run assembly programs by itself easily. However,
> > > > > to run a basic program, the shell must do some more complicated stuff:
> > > > > 1) Set Ans to 1. Use those funky op routines.
> > > > > 2) Modify the basic program in RAM, so that :::::::: is replaced with
> > > > > the BASIC program (Ex: :::::::: -> BProg:::)
> > > > > 3) Quit. Yes, the shell quits.
> > > > >
> > > > > The shell quits, and since Ans = 1, it jumps to the ::::::::, which is
> > > > > now BProg:::
> > > > > The TIOS runs BProg and -doesn't- crash ;)
> > > > > The shell is started again.
> > > > >
> > > > > For the shell to exit, it just sets Ans to zero and quits.
> > > > > --robin
> > > > >
> > > > > Cassady Roop wrote:
> > > > > >
> > > > > > Hold on, just what exactly does that mean? What is a BASIC loader?
> > > > > >
> > > > > > Kirk Meyer wrote:
> > > > > > >
> > > > > > > The problem with _exec_basic is one that has been known for quite
> > > >some time,
> > > > > > > and this is why any good shell uses a BASIC loader and runs BASIC
> > > >programs
> > > > > > > from BASIC - simply because they won't work otherwise.
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: Cassady Roop <croop@oregontrail.net>
> > > > > > > To: <assembly-86@lists.ticalc.org>
> > > > > > > Sent: Wednesday, December 08, 1999 7:56 PM
> > > > > > > Subject: A86: _exec_basic and _findAlphaUp
> > > > > > >
> > > > > > > > When I use _exec_basic to run a basic program, it runs perfectly
> > > >but for
> > > > > > > > one problem: if the basic program has a STOP command at the end,
> > > > > > > > instead of a RETURN or nothing at all, it crashes the calculator
> > > > > > > > totally. Is this a bug in _exec_basic or am I not passing
> > > >something to
> > > > > > > > the routine that I should be? I am passing in the name to run in
> > > >OP1;
> > > > > > > > I thought that was all it needed. I have ROM 1.3. Can anyone
> > > >duplicate
> > > > > > > > this?
> > > >
> > >
> > > ______________________________________________________
> > > Get Your Private, Free Email at http://www.hotmail.com
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