Thank you for the Answers. You totally confirmed any assumptions I may
have had. It really helps to picture Stella as a whole.
I've got to say that I'm getting excited about this stuff.
I'm a Visual Basic Programmer by profession, it's fantastic to find
something I can do that is so far from programming Visual Basic.
Thanks again for all your help, y'all never let me down.
----- Original Message -----
From: "Manuel Polik" <cybergoth@xxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Friday, November 02, 2001 8:05 AM
Subject: Re: [stella] Zero-Page Memory Addressing.. (Still a newbie, but
getting there.)
> HiJoel!
>
> >to me now... Absolute Addressing is 1 click slower
> right?
>
> Depending on what you're doing, in most cases: yes!
>
> >My question is about Zero-Page Addressing. Any thing
> in zero-page is
> >accessed with single bytes, that's easy. But where is
> this Zero-Page stuff
> >located??
>
> It is, as the name indicates the first page, i.e. the
> bytes from $00 to $FF (or from $0000 to $00FF to be more
> precise)
>
> > Is it allready built into the Atari somewhere, instead
> of on the
> >cart??
>
> Yup!
>
> > What is the size of the Zero-Page I've seen variables
> > defined
> > usually set in the &80 range..
>
> The zero page is splitted in two equal parts.
>
> The first from $00 - $7F is where the TIA registers are
> located. (Check out VCS.H to find out where is which.)
>
> The second half is the famous 128 byte RAM. As you
> already found out, it's ranging from $80 - $FF.
>
> So all RAM access is actually in the zeropage, which
> means there's very fast access here. (Any serious C64
> coder would sell his grandma for 128 Bytes free zeropage
> RAM, BTW :-))
>
> >Thanks,
>
> HTH
>
> > I'm sorry again if this is a total repeat.
>
> Uhm, well... :-)
>
> Greetings,
> Manuel
>
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