Re: [hatari-devel] How to detect Hatari?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 04/02/2017 à 12:00, Christian Zietz a écrit :
> Nicolas Pomarède schrieb:
>
> > You need to enable natfeats extension, then you can call the nf_name
> > method for example. But by default natfeats is not enabled, so you can't
> > expect other people to have it too in case you want your program to
> > detect Hatari or not.
>
> As far as I know, Steem can be detected using the interface first
> introduced a long time ago by PaCifiST:
> <http://toshyp.atari.org/en/00e005.html>. Support for this of course
> requires the emulator to intercept calls to the Vsync XBIOS call. I
> don't know if Hatari wants to do this.

This is not really different from natfeats, but the whole question is : 
should this be enabled by default or not ? In the case of steem it uses 
address $ffc1xx for a few "hidden" registers

They are unlikely to be used by any "normal" ST programs, but in case 
you access them anyway I think it's better if the default behaviour of 
the emulator is to disable these features and return the expected 
content of theses registers on real HW.

Maybe we could add a more complex scenario to trigger emulator specific 
functions, something that no program is supposed to do by luck (for 
example, read $ff8240 then read ffa000 then read ff8210, everything in 
less than 100 cycles : then enable natfeats even if it was disabled before)

Nicolas