[A83] Re: Stacking

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[A83] Re: Stacking


My calc (well, vti) crashes, yes.
However, after resetting the ram, the archive (VAT) is still there.
It shouldn't be, should it?

>If by it doesn't work, you mean it crashes, it's because you changed the
>stack pointer but then you're returning. You need to restore the stack
>pointer after you change it. But if you intend to crash the calculator, you
>might as well just do something simple...
>
>-----Original Message-----
>From: assembly-83-bounce@lists.ticalc.org
>[mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Ronald Teune
>Sent: Monday, July 16, 2001 11:06 AM
>To: assembly-83@lists.ticalc.org
>Subject: [A83] Re: Stacking
>
>
>
>.nolist
>#include "ion.inc"
>.list
>#ifdef TI83P
>        .org    progstart-2
>          .db     $BB,$6D
>#else
>        .org    progstart
>#endif
>        ret
>        jr      nc,begin
>
>        .db     "DeztroyThaVAT",0
>Begin:
> ld b,$FF
> ld hl,$0000
> ld sp,VAT
>loop:
> push hl
> djnz loop
> ret
>.end
>END
>
>
>How Evil Is This >:->
>However, it doesn't seem to work.
>
>>Good point, I had written the message before I thought well.
>>Point of concern is that you must remember to put the stack pointer at the
>>END of the memory block, in the example case:
>>ld sp,plotsscreen+300h
>>
>>If you don't, then PUSHES :-) will corrupt other data.
>>
>>Thanks for the correction.
>>--(Peter-Martijn)
>>
>>>
>>> Popping doesn't corrupt data anyway, only pushing does.  And if your
code
>>> doesn't manage it's pushes and pops properly, it's likely to crash no
>matter
>>> where the stack pointer is.
>>>
>>>
>>> In a message dated 7/14/2001 10:38:20 AM Eastern Daylight Time,
>>> hyper@hysoft-automation.com writes:
>>>
>>>
>>> > Well, I meant that if you need to be careful, since if you pop a
little
>too
>>> > often, you end up corrupting data.
>>> > Also, I might have misinterpreted some previous posts about using the
>stack
>>> > pointer, and I actually added the statement to point out that I do
know
>>> > about
>>> > the dangers.
>>> >
>>> >
>>>
>>>
>>>
>>>
>>> ----
>>> Jonah Cohen
>>> <ComAsYuAre@aol.com>
>>> http://jonah.ticalc.org
>>>
>>>
>>>
>>
>>
>>
>
>
>
>
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