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Groups > comp.sys.apple2.programmer > #214

Re: Best place to hide about 30 bytes in //e RAM

Date 2012-03-04 17:55 -0600
Subject Re: Best place to hide about 30 bytes in //e RAM
From Hugh Hood <hughhood@earthlink.net>
Newsgroups comp.sys.apple2.programmer
Message-ID <CB795D1E.8B4B%hughhood@earthlink.net> (permalink)
References <jite2e$7vc$1@news.xmission.com> <VJSdnWiZfuoI8c_SnZ2dnUVZ_vWdnZ2d@giganews.com>

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Steven,

I don't mean to step on Eagan's thread, but your idea of stealing a few
bytes from the beginning of the stack page is super nifty.

Frankly, I never considered it, until now. Thanks.

I wonder how far into that stack page a guy could go before he ran into
trouble? I guess it 'depends'. Hmmmm.

BTW, your tease about the RamFAST ROM mod just screams for more detail.

Apologies, Eagan.




Hugh Hood
 






in article VJSdnWiZfuoI8c_SnZ2dnUVZ_vWdnZ2d@giganews.com, Steven Hirsch at
snhirsch@gmail.com wrote on 3/3/12 1:10 PM:

> 
> How about the beginning of the stack page?  IIRC, few (if any) programs get
> that close to the end.  I hacked up a modified version of the RamFast ROM that
> copied a small software loop into that location to speed things up when
> running with ZipChip or TransWarp 2e accelerators (where DMA is a
> non-starter).  Never saw a problem with stack collisions.
> 

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Thread

Best place to hide about 30 bytes in //e RAM Egan Ford <datajerk@gmail.com> - 2012-03-03 07:41 -0800
  Re: Best place to hide about 30 bytes in //e RAM Steven Hirsch <snhirsch@gmail.com> - 2012-03-03 14:10 -0500
    Re: Best place to hide about 30 bytes in //e RAM Hugh Hood <hughhood@earthlink.net> - 2012-03-04 17:55 -0600
      Re: Best place to hide about 30 bytes in //e RAM Hugh Hood <hughhood@earthlink.net> - 2012-03-04 17:57 -0600
        Re: Best place to hide about 30 bytes in //e RAM Egan Ford <datajerk@gmail.com> - 2012-03-05 08:55 -0700
  Re: Best place to hide about 30 bytes in //e RAM Antoine Vignau <antoine.vignau@laposte.net> - 2012-03-03 12:53 -0800
  Re: Best place to hide about 30 bytes in //e RAM "ict@ccess" <gids.rs@sasktel.net> - 2012-03-03 18:47 -0800
  Re: Best place to hide about 30 bytes in //e RAM Egan Ford <datajerk@gmail.com> - 2012-03-04 11:33 -0700
    Re: Best place to hide about 30 bytes in //e RAM "ict@ccess" <gids.rs@sasktel.net> - 2012-03-04 19:19 -0800
      Re: Best place to hide about 30 bytes in //e RAM Egan Ford <datajerk@gmail.com> - 2012-03-05 08:56 -0700
        Re: Best place to hide about 30 bytes in //e RAM Antoine Vignau <antoine.vignau@laposte.net> - 2012-03-05 14:25 -0800

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