Re: [hatari-devel] Re: Some findings from "SYNC - The LoSTE screens" development

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

On 18/09/2013 22:45, Troed Sångberg wrote:
> Nicolas, #2 below is the answer to the question about RESET and the
> floppy problem ("Possible 1.7 regression") ;) Glad you found it! I was
> wondering how come a problematic image suddenly started working just as
> I was about to release the demo - now I know :)

I'm slowly unstacking some pending mails I had during the holidays, I 
should have read this one more carefully before answering about the 
problem with disk image using reset :)

As for reset affecting the shifter, I never heard about it, but as the 
STE had many STF separate parts mixed in a single chip, it's possible 
the reset signal has some different effect than on stf (where the 
shifter has no reset pin)

> Also, with regards to #3, I think Hatari does the same as STeem and
> assumes a specific location for a 60/50 switch as causing +2 lines, for
> both ST and STE. See this post for more information on why those two are
> very different:
> http://www.atari-forum.com/viewtopic.php?f=16&t=24855&start=337

It's possible some border removal timings are sometimes fixed to a 
single location, instead of allowing a wider range as it should

That's part of the things I intend to rewrite for the shifter emulation, 
but so far many things were coded in a pragmatic way to allow most demos 
to work, not to emulate things that should work but were never used in 
real demos/games. So current emulation is sometimes not as permissive as 
the real HW would be.



Nicolas