Groups > comp.sys.apple2.programmer > #4816

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

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From	Brian Patrie <bpatrie@bellsouth.spamisicky.net>
Newsgroups	comp.sys.apple2.programmer
Subject	Re: Reading the state of VBL on a IIc,IIc+.
Date	Tue, 9 Oct 2018 13:19:44 -0500
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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).

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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