Re: [hatari-devel] Manual update |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Manual update
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Thu, 2 Jan 2020 11:42:07 +0100
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Eero Tamminen schrieb:
> (Except that I just noticed that I missed
> blitter for MegaST.)
Also, in the table, the "X" for RTC was incorrectly placed in the STE
column, instead of the MegaST one.
> Btw. System dialog section mentions that
> the emulated ST add-on blitter is Ricoh,
> but Mega-ST one is IMP one.
If it was worded like this in the manual, it would certainly be wrong.
The difference between Ricoh and IMP does *not* refer to the Blitter but
to the (rest of the) chipset. There are observable differences in the
Glue (regarding which addresses cause a bus error) and in the MMU
(regarding handling of certain memory bank combinations).
Blitters, in particular, were never even made by Ricoh. Known Blitter
manufacturers are ST (SGS Thomson), GE/RCA, National Semiconductors and
IMP. Atari also contacted further manufacturers about the Blitter, but
they never appeared in the wild -- if they were ever produced. Until
now, between the manufacturers no difference relevant to emulation is
known. (Afair, Hatari doesn't emulate some weird Blitter corner cases
correctly, anyway.)
Regards
Christian
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: http://www.chzsoft.de/
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