| Re: [hatari-devel] Hatari freezing when running FIX24.PRG |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Hatari freezing when running FIX24.PRG
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Tue, 9 Oct 2018 18:36:15 +0200
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Nicolas Pomarède schrieb:
> In fact, I wonder if the content of $42e (phystop, incorrectly called
> memtop in fix24.s) might not be wrong, which would cause content at $738
> to be overwritten.
>
> When TT ram is added, $42e contains E00000 if I start with 14 MB of RAM.
>
> But should $42e contain the end of TT RAM space instead ? For example
> $2000000 when 16 MB of TT RAM are present ?
>
> what does TOS do on real HW with TT-RAM ?
I could test on a real TT later if you want. But I'm already very
certain that $42e is supposed to only contain ST-RAM:
phystop LONG 0x42e Pointer to the first byte above the physical
end of the ST-compatible RAM region (physical top of ST-compatible RAM)
The end of TT-RAM is in...
ramtop LONG 0x5a4 Pointer to the end of the Fast-RAM in Atari TT
(not officially documented).
<http://toshyp.atari.org/en/003004.html>
I think the problem here is that Hatari allows you to run with 14 MB of
*ST*-RAM and FIX24.PRG does not take this possibility into account. Real
TTs -- at least with Atari's RAM boards -- could have 10 MB ST-RAM maximum.
Regards
Christian
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: http://www.chzsoft.de/
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