Re: [cc65] Problems with Atari zeropage variables

From: Greg King <gngking1erols.com>
Date: 2005-07-22 21:26:28
From: Fatih AygŁn; on Date: July 22, 2005, at 06:45 AM -0400
>
> While working on Atari TGI drivers, I noticed that the
> addresses of the runtime zeropage variables in the
> module don't match with the addresses in the main program.
> There is a 6-byte "shift".
>
> It seems that the cause is the file "read.s". In that
> file, some zeropage variables are defined. I think that
> they should be linked AFTER the runtime zeropage
> variables, otherwise the zeropage mapping logic with
> the modules won't work. Or, maybe they can be mapped
> to standard runtime variables.

Several of the platforms have that problem.  They solve it by putting their
extra zero-page variables into another segment called "EXTZP".

I think that it's backwards!  I think that the compiler's pseudo-registers
should be the objects that are put into a specially named segment
(.segment "CC65ZP":zp).  Then, .zeropage can be used for whatever other
zero-page variables a programmer wants to put into a library or program --
".zeropage" is easier for us to remember than the spelling of some special
name.
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Received on Fri Jul 22 21:26:40 2005

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