Floating Bus quirks

[Jonathan Schattke <wizwom@ripco.com>]

I was reading the October, 1982 issue of SofTalk, wherein Bob Bishop has
a nice little article that starts with a quick little program that
displays text in the upper half of the screen, and graphics in the lower
half.

It's a pretty neat trick, although it needed a little tweaking on my
Apple //e to work properly.  However, this trick will not work on
emulators.

So, since I'm working on AppleWin anyway, I think I will make it conform
to the actual floating bus concept, primarily by setting the video code
free from the processor code (since the Apple ][ effectively
multi-processed the CPU and video logic), then having a global variable
which would be the "last data", which would be the contents of the
memory that the video code was looking at.  Then any read which was from
a null-i/o would have that data set.
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