Re: [hatari-devel] Yanartas demo doesn't work in ST mode

[Troed Sångberg <troed@xxxxxxxxxxx>]

Right, so, the GLUE has no concept of switches ;) It's just a question of what values are in the registers when the state machine reaches a possible state change. I looked into my notes and my recall was incorrect - the position in question is cycle 502. So, if $820a is 60Hz at that cycle on line 33 or 199 the corresponding border will "open"..

And according to my notes this is valid for STE & ST WS1/WS3. For ST WS2/WS4 it's 504. (Tests done on synclocked lines - there are other issues if counting from HBL.) Of course, any RES detection we already know differs between wakestates so this is as expected.

Being back at 50Hz already at cycle 500 (and staying there) shouldn't work according to my own synclocked tests :/

/Troed

On Tue, Feb 3, 2015 at 11:52 PM, Nicolas Pomarède <npomarede@xxxxxxxxxxxx> wrote:

Le 03/02/2015 23:38, Troed Sångberg a écrit :

FYI, I've seen you comment on this before, but nothing in my research
supports top/lower border removal being different between ST and STE.
IIRC it's cycle 508 that's important for the state machine on both.

(However, if you're measuring from the HBL interrupt then some
interesting things happen with regards to ST wakestates. STE is as usual
same as ST WS1 though. This research I haven't documented publicly yet)