Re: [hatari-devel] IMP chipset (in)compatibility

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Hi Christian,

This Team Suzuki (preview) version works fine with Hatari MegaST emulation:

Which I think should be mentioned in the compatibility note.

And the version of Team Suzuki you linked, works also with Hatari MegaSTE emulation (which should also be noted), not just ST & STE emulation. It bus errors only with MegaST emulation.

Whereas G-Loc doesn't work either with MegaST or MegaSTE.

=> Are you sure IMP is the issue with both of the games?

	- Eero

On 10.3.2021 21.21, Christian Zietz wrote:
over in a German forum [1], a user wondered why two games (G-Loc and
Team Suzuki) wouldn't run on his (real) MegaST. And he was able to
confirm this with Hatari: Runs on emulated ST, doesn't run on emulated

Wild theories were discussed (regarding Blitter and RTC), but in the
end, this turned out to be a chipset issue, both in Hatari as in the
real HW. I checked both games: they reset the (STE-only) 'linewidth'
register $FF820E/FF820F. This is harmless on an ST/MegaST with Ricoh
chipset but causes a bus error on an IMP chipset, as confirmed by your

This explains the user's observation, as Hatari emulates the MegaST with
an IMP chipset, but the ST with a Ricoh chipset. Furthermore, the user
confirms that his real MegaST indeed has an IMP chipset. Note that I'm
therefore *not* saying Hatari is wrong here (you had to make a choice).
  I'm proposing a patch (attached) to compatibility.html.


Christian Zietz  -  CHZ-Soft  -  czietz@xxxxxxx
PGP/GnuPG-Key-ID: 0x52CB97F66DA025CA / 0x6DA025CA

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