Re: Bidirectional parallel port

[nparker@cie-2.uoregon.edu (Neil Parker)]

In article <869672927.17423@dejanews.com> haubi@geocities.com writes:
>Hi!
>Does anybody know how to *read* from a printer interface, something like
>peeking $C090? Please reply by PM.

With most Apple II parallel interfaces, you can't--reading from the
I/O addresses just returns garbage.

In fact, I once used a parallel interface (the Tymac PPC-100) where reading
from the I/O addresses not only returned garbage, it also transmitted a
copy of that garbage to the printer.  I've never tried it with other cards,
but it wouldn't suprise me if many of them behave the same way.

              - Neil Parker
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