Subject:
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Re: Zero Page Variables?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 29 Feb 1996 20:38:49 GMT
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Original-From:
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Fred G. Martin <fredm@^antispam^media.mit.edu>
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Viewed:
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2394 times
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David,
I believe that IC never actually supported zero page variables; it was
documented as a feature but never implemented.
Your solution of using the indexed registers is what I was going to
suggest.
-Fred
--
This message was composed using Articulate Systems' PowerSecretary,
a Macintosh-based speech-to-text dictation system.
Please forgive any sloppiness in the formatting. Thanks. -Fred
In your message you said:
> IC gurus,
> I am trying to port some of my IR routines to IC and I am having trouble.
> I use some bit operations on variables, but this means that the variables
> must be in the ZP. I converted the variables to be anywhere in the RAM but
> then I have to add extra code.
>
> For example I went from having:
>
> BRSET myvariable $80 Jumplocation
>
> to:
> LDY #myvariable
> BRSET 0,Y $80 Jumplocation
>
> Now, although this is doable, I would rather not have to do this everytime
> I have a bit operation on a variable. Now I tried to make ZP variables but
> then IC choked on the .icb file saying something like the .s19 file was not
> contiguous. I had:
>
> ORG ZERO_PAGE_START
>
> variable1 FCB 0
>
> ORG MAIN_START
>
> variable2 FCB 0
>
> But IC did not like the compiled version. So although I have a workaround,
> is there a way to make ZP variables? I am curious.
>
> -Dave Negro
> dln2@cornell.edu
>
>
>
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Message is in Reply To:
 | | Zero Page Variables?
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| IC gurus, I am trying to port some of my IR routines to IC and I am having trouble. I use some bit operations on variables, but this means that the variables must be in the ZP. I converted the variables to be anywhere in the RAM but then I have to (...) (29 years ago, 29-Feb-96, to lugnet.robotics.handyboard)
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