Re: [hatari-devel] TT emulation

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Hi,

Both demos needs unsupported by Hatari feature - TT-RAM. And in case of Ray's TT-Highres  TT cycle exact mode.
Currently, access to ST-RAM (and hardware I guess) is too fast in case of TT emulation. The TT has 500ns access to ST-RAM (like ST) but under Hatari, Nembench shows that access is about twice faster (Falcon's style?)


Falcon style, or maybe falcon bug too :)
I've tried to render the 68030 instructions as accurate as possible (in 
cpu cycles).
But the new core emulation is far from being totally accurate.

There are still many things to improve, general timings are one of them.

Regards
Laurent



Le 12/07/2012 13:18, Konador, Cyprian a écrit :
> > -----Original Message-----
> > From: Eero Tamminen [mailto:oak@xxxxxxxxxxxxxx]
> > Sent: Wednesday, July 11, 2012 19:13 PM
> > To: hatari-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [hatari-devel] TT emulation
> [...]
> > In general it looks OK to me.  Here are couple of quick comments:
> >
> > * bTTSampleHold is used in Videl drawing code, but it doesn't seem to
> >    be zeroed if user switches to Falcon emulation (which also uses videl
> >    code).  This the only real issue.
> Ok, I'll correct that.
>
>   
> > * Only bTTSampleHold seems need to be global, i.e. it seems that
> >    bTThypermono should be static...
> Ok, I'll move bool bTTHypermono from screen.h to video.c as static bool..
> I thought about that and wasn't sure if its ok. Finally I put both TT special video modes together in one file.
>
>
> > * rest of videl.c code uses different brace ('{}') positioning convention[1]
> >    than your patch.
> >
> > [1] Different files in Hatari sources use different  conventions depending
> >      on their originating project and who has written / maintains them..
> Ok, I'll correct that.
>
>
> > > In additional, I attached test application for SampleHold and TT
> > > Hypermono mode.
> > That seems to work.  Are there any other demos using these modes?
> I don’t think so.
> But as I mentioned before, I'm trying to prepare small TT demo with those features.
>   
>
> > There are actually already several other TT demos (from tscc) that don't work
> > properly in Hatari (as documented in compatibility list), for example:
> > * http://pouet.net/prod.php?which=52339
> > * http://pouet.net/prod.php?which=16426
> Both demos needs unsupported by Hatari feature - TT-RAM. And in case of Ray's TT-Highres  TT cycle exact mode.
> Currently, access to ST-RAM (and hardware I guess) is too fast in case of TT emulation. The TT has 500ns access to ST-RAM (like ST) but under Hatari, Nembench shows that access is about twice faster (Falcon's style?)
>
> Regards
> Cyprian