On 2022-04-14, Oliver Schmidt  wrote:   
   >   
   > Maybe I don't get your use case right, but in general my code in   
   > https://github.com/cc65/cc65/blob/master/libsrc/apple2/waitvsync.s is   
   > supposed to be "the" correct solution. Even 4am (!) adopted its //c logic   
   > for Total Replay after an in depth discussion.   
      
   thanks, I've dropped your code in and it works (at least in the emulator,   
   I don't have a IIc).  It has the same effect that the other code I had   
   (which I was worrying about) which was starting in an odd place for my   
   cycle counting code, but now suspect that your code is right and that   
   I have the sense of the VBLANK reversed in my IIe/IIgs code.   
      
   Vince   
      
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