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Re: Reading the state of VBL on a IIc,IIc+.

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On 2018-10-08 15:18, Michael J. Mahon wrote:
> Brian Patrie <bpatrie@bellsouth.spamisicky.net> wrote:
>> Thanks, Antoine, and Frank.
>>
>> (FWIW, my main use-case is pacing a timeout in a key input subroutine.)
>>
> 
> This reminds me of a discussion I had several years ago, when I was
> building the graphical interface for a 4x4x4 3D Tic-Tac-Toe game.
> 
> The game code was pretty processor intensive, and so would benefit from a
> Zip Chip-style speedup, but the animations were for user interaction, so I
> wanted the video to run at standard speed (as occurs with any Apple II
> accelerator).
> 
> Since I anticipated that the game would often be played on an emulator, I
> asked whether any emulators with acceleration kept the video speeds
> standard.
> 
> At the time, I was told that emulator acceleration was “across the board”,
> and that nothing equivalent to a hardware A2 accelerator was provided.
> Needless to say, that precluded any “real time” (as opposed to accelerated)
> animation.
> 
> It seems that your desire to use VBL sensing for a “real time” timeout
> might run afoul of the same problem if run under accelerated emulation.
> 
> I still think it would be a great idea for emulators to provide a Zip-style
> processor acceleration in addition to the usual “everything speeds up”
> modes.

As Kent says in another reply, KEGS and its descendants do.  AppleWin, 
does not (which can be good or bad, depending upon the needs of the moment).

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Thread

Reading the state of VBL on a IIc,IIc+. Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2018-10-06 09:02 -0500
  Re: Reading the state of VBL on a IIc,IIc+. Antoine Vignau <antoine.vignau@laposte.net> - 2018-10-06 07:30 -0700
  Re: Reading the state of VBL on a IIc,IIc+. "Frank M." <frank_o_rama@hotmail.com> - 2018-10-06 07:43 -0700
    Re: Reading the state of VBL on a IIc,IIc+. Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2018-10-07 17:29 -0500
      Re: Reading the state of VBL on a IIc,IIc+. Michael J. Mahon <mjmahon@aol.com> - 2018-10-08 15:18 -0500
        Re: Reading the state of VBL on a IIc,IIc+. kegs@provalid.com (Kent Dickey) - 2018-10-08 19:32 -0500
        Re: Reading the state of VBL on a IIc,IIc+. Brian Patrie <bpatrie@bellsouth.spamisicky.net> - 2018-10-09 13:19 -0500
          Re: Reading the state of VBL on a IIc,IIc+. Michael J. Mahon <mjmahon@aol.com> - 2018-10-09 15:48 -0500
            Re: Reading the state of VBL on a IIc,IIc+. TomCh <tomcharlesworth26@gmail.com> - 2018-10-10 14:32 -0700
              Re: Reading the state of VBL on a IIc,IIc+. Michael J. Mahon <mjmahon@aol.com> - 2018-10-11 00:19 -0500

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