Re: Escape from the Homebrew Computer Club goes ProDOS

["Michael J. Mahon" <mjmahon@aol.com>]

David Schmenk wrote:
> Tristan Mumford wrote:
>
> > David Schmenk wrote:
> >
> > > I hacked the loader to use ProDOS MLI calls in order to run HBCC under
> > > ProDOS (and thus CFFAs and hard disks).  It uses the exact same binaries
> > > as version 1.2.  I added a tools directory and source directory for fun.
> >
> >
> >  Just out of curiosity, when it runs on something accelerated, e.g. a 
> > IIgs
> > at full speed or something with a Zip Chip etc. does it run faster or 
> > with
> > a higher framerate?
> >
> > Tristan.
>
> It does run faster, but the joystick code whacks out.  If your 
> accelerator can slow down during joystick address fetches, it should 
> function OK. You can disable the joystick with the J key (CAPS LOCK) and 
> use the keyboard controls. However, the timing is based off a 1 MHz 
> processor, so everything gets accelerated, including the movement of bad 
> guys and time.  It runs at something like 200 Hz on my 9 MHz GS.  Kinda 
> useless.  There really isn't any generic mechanism on the Apple II to 
> establish a consistent timebase.  If everyone had a mouse card it would 
> solve that problem, but not everyone (or every Apple II) does.

Actually, for the //e and later machines, there is the possibility of
establishing the clock rate of the machine (or emulator) by polling
the VBL level, which pulses every 60th of a second of real time.

Once the clock rate is established, the progression of game time
can be set to a standard rate, independent of frame rate.

-michael

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