Ok. I get that. If I read it right.
All the games could have been as much as 32K (if they had wanted them to
be,) but the system only reads 4K at a time and waits for the program to
tell it which 4K to read next. Right?
>You can bankswitch a single byte in and out if you really want to.
Ok, but is switching out smaller amounts better or worse, or does it depend
on what you are trying to do?
Hope you guys don't mind but I'm going to label this as a new thread. The
subject line didn't seem to fit.
Thanks
Brian
----- Original Message -----
From: "Chris Wilkson" <ecwilkso@xxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Tuesday, February 12, 2002 12:59 AM
Subject: Re: [stella] I live... again!
> On Tue, 12 Feb 2002, MoonlightKnight wrote:
>
> > Since I'm realitivly new to this, I have a question.
> >
> > I know that most of the original Atari games were written in 4K or less,
but
> > my question is this:
> >
> > Is it the game cartridge or the system that does the bankswitching? And
if
> > so so do you have to bankswitch at 8K or is it higher than that?
>
> Hi Brian,
>
> As far as the 6507 is concerned, it's just a single 4K block of memory.
> Only the programmer and the bankswitching cartridge know the difference.
> The cartridge watches the address lines for certain "hot" addresses to
> be accessed and switches the proper bank into addresses $1000-$1fff for
> the next ROM access.
>
> You can bankswitch a single byte in and out if you really want to. Each
> cartridge maker had their own special way of doing it. My cartridges
> support the "standard" Atari format, up to 32K...it just breaks the ROM
> into 4KB banks and switches them in whenever an address in the $1ff4-$1ffa
> range is accessed.
>
> -Chris
>
>
>
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