> Hertzfeld is, of course famous in Mac circles as the man responsible
> for much of the Mac?s Operating System and design of the Toolbox.
>
> So, in late December he decided to satisfy his curiosity about the
> QuickDraw graphics routines and how they were coded. This is really
> easy to do, he says.
>
> Just get the Mac II to do the graphics operation in which you?re
> interested, and then randomly hit the interrupt button. This will
> interrupt it statistically in the place it?s executing the most--the
> inner loop.
>
> What Hertzfeld discovered was that the inner loops weren?t optimally
> coded. His initial strategy was to move the entire QuickDraw into
> RAM. He wrote an INIT that moved 60k of the ROM out into RAM where
> he could patch it.

You can read about it here [MacTech][1]

Compatibility
Architecture: 68k

  [1]: http://preserve.mactech.com/articles/mactech/Vol.04/04.06/Hertzfeld/index.html

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