Re: [hatari-devel] Re: Screen in Protracker

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 21/02/2017 à 19:00, Anders Eriksson a écrit :
> On Tue, 21 Feb 2017, Nicolas Pomarède wrote:
>
> > Le 21/02/2017 à 16:57, Anders Eriksson a écrit :
> > > Just for the record, I've used Hatari to make many Protracker videos
> > > over the years, it works fine. It's a PAL program so don't use american
> > > TOS, although I suppose forcing it to 50 Hz with a small program ahead
> > > of launching Protracker will work as well.
> >
> > Hi
> >
> > In fact, the program keeps the video freq that was used at start under
> > gem (50 or 60 Hz) and try to remove the border in both cases.
> > So, with US TOS if you switch gem to 50 Hz before running protracker,
> > it should work too.
>
> I tested Protracker with US TOS in both 60 and 50 Hz.
>
> It have a slight bug in 60 Hz, some garbage pixels on the lower border
> line and it also reduces the pattern view to lesser lines than in 50 Hz
> mode.
>
> Switching to 50 Hz before starting the tracker makes it behave like a
> euro TOS. It would be nice if Hatari somehow displayed which refreshrate
> it is currently emulating.

I confirm the bottom display is not 100 % correct either on my STF FR 
when I start in 60 Hz. There's a flickering black line just after the 
1st pixel line of row "01". This is because the switch to 50 Hz lasts 
sometimes too long and will create a blank line (tested in WS2, but 
should be the case in all WS)

But I don't get the yellow pixels that can be seen under Hatari, so 
there's a slight bug to fix here anyway.

Also Hatari seems to display too much lines in the bottom border ; on my 
STF + CRT, display stops after the 1st pixel line of row "05" (but this 
could be a limitation of my CRT). Under Hatari 8 additional lines are 
displayed.

According to Alien and Troed docs, 60 Hz screen + bottom should be 224 
visible lines before vblank, which would match my STF.

Nicolas