Re: [hatari-devel] ST bus error results

[Troed Sångberg <troed@xxxxxxxxxxx>]

Thanks for this investigation guys - being able to, from software, detect whether the ST has IMP or Ricoh chipsets might be of real interest for hardcore demo coding. 

(... and that would later probably spill into if it needs to be emulated ;)

regards,
Troed


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On April 28, 2018 12:06 PM, Christian Zietz <czietz@xxxxxxx> wrote:

> ​​
> 
> Thomas Huth schrieb:
> 
> > Would be interesting to
> > 
> > know whether Ricoh chips have still been used for Mega-STs, or if all
> > 
> > Megas were already shipped with an IMP chip...
> 
> I think that Megas were also shipped with Ricoh chipset. Browsing the
> 
> Mega ST mainboard photo gallery at
> 
> https://www.exxoshost.co.uk/forum/viewforum.php?f=55, one finds two
> 
> mainboards with Ricoh chips. The parts list in the Mega ST service
> 
> manual also makes reference to the part numbers of the Ricoh chips
> 
> (C02591x). Finally, Atari technical notes [1] mention that some Mega ST
> 
> mainboard revisions need to be modified for IMP chips, implying that
> 
> they were originally designed for Ricoh ones.
> 
> However, I wonder how to integrate this into Hatari. A chipset selection
> 
> option would be too technical for most users, I think.
> 
> PS: Note that the IMP chipset not only differs in terms of bus error
> 
> generation but e.g. also in terms of handling of memory banks by the MMU.
> 
> Regards
> 
> Christian
> 
> [1] http://gossuin.be/images/schemasatari/Notes Technique 2 FR.pdf
> 
> --
> 
> Christian Zietz - CHZ-Soft - czietz@xxxxxxx
> 
> WWW: http://www.chzsoft.de/
> 
> PGP/GnuPG-Key-ID: 0x52CB97F66DA025CA / 0x6DA025CA