A86: Re: Exiting a Program

To: assembly-86@lists.ticalc.org
Subject: A86: Re: Exiting a Program
From: jdaomteys@juno.com (James Doty)
Date: Tue, 11 Aug 1998 22:10:32 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <029601bdde95$0fd73f60$5b10e6a5@sammy.rutgers.edu>
Reply-To: assembly-86@lists.ticalc.org

No, the ret crashed my calc. For the shell problems,  I used one of the
undocumented rom calls (ti86und.inc) that exits and resets the stack, and
that was having the shell problems.
I did the "ld ix, sp" thing posted earlier, and it workes fine  with the
ret now. I'll check my source again, though, for un-popped pushes.

--James

On Sat, 12 Sep 1998 21:20:18 -0500 David Phillips <electrum@tfs.net>
writes:
>
>Your sprite routines *shouldn't* be corrupting the stack.  If they 
>return
>without crashing, then they are fine.  The reason is that if they were
>corrupting the stack, the RET at the end would return to some bogus 
>address
>and crash.
>
>If it only crashes when you return to the OS, then your problem is
>somewhere in your main loop, not inside a subroutine.  If you corrupt 
>the
>stack in a subroutine, it will crash instead of RETurning.  You are 
>most
>likely restoring a counter at the top of a loop, and not clearing it 
>from
>the stack when the loop ends.

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Re: A86: Re: Exiting a Program

From: Andy Johnson <prjohnson@utahlinx.com>

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