[A83] Re: Explaining the stack for registers

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[A83] Re: Explaining the stack for registers


Ahh I understand much better now!!!
I thought that every register that can be pushed had it's own stack, so I 
was a bit confused when it appeared that the content of one register could 
somehow be loaded in another register, but I understand very well now, thank 
you very much for your explanation!


>From: "Michael Vincent" <hookman@worldnet.att.net>
>Reply-To: assembly-83@lists.ticalc.org
>To: <assembly-83@lists.ticalc.org>
>Subject: [A83] Re: Explaining the stack for registers
>Date: Thu, 16 Aug 2001 10:12:18 -0700
>
>
>First, "if you push af and then pop bc" the contents will be in BC, not AF.
>The reason for this is when you push a register, the values in it are put 
>on
>the stack, not the name. So if you push af then the value of A and the 
>flags
>byte are on the stack. You can then pop whatever you want. If you pop bc
>then the 2 bytes on the stack from the push af will be put in BC. (B will
>have what was in A, and C will have what was in F).
>
>There is no limit to how many times a register can be pushed, except on the
>TI-83 Plus (and I think 83) the stack is only 400 bytes. After that you 
>will
>corrupt RAM. The TI-OS uses a few bytes, but you have like 100 pushes or
>more you could do before you overflowed the stack.
>
>
>Michael Vincent
>Detached Solutions - www.detacheds.com
>Radical Software - www.radicalsoft.org
>
>----- Original Message -----
>From: "TypeR unknown" <typerfuture@hotmail.com>
>To: <assembly-83@lists.ticalc.org>
>Sent: Thursday, August 16, 2001 10:00 AM
>Subject: [A83] Explaining the stack for registers
>
>
> >
> > After reading the FAQ in AsmGuru there is a question about the stack 
>with
> > registers. It says that (if I remember correctly) "if you push af and 
>then
> > pop bc, the contents of bc will be in af"
> >
> > WHY ???
> >
> > I see no logic in that, and unfortunatly it isn't explained in AsmGuru
> > either, so here I am :)
> >
> > Also I would like to know how many times a register can be pushed.
> >
> >
> >
> >
> > _________________________________________________________________
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>
>


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