2009 meets 1978 - need cassette port testing program.

[Ralph <rwhyre@gmail.com>]

I'm working on an platinum Apple //e (named "Doc", if anyone is
curious), trying to get ADTPro going on it so I can archive more
floppies.

I wasn't having with the audio bootstrap method, so I found a 30-year
old GE recorder, and paired it with a
10-year old audio cassette (new in packaging).   It seems to record
cassette port audio from the Apple just fine, but I'm not having much
luck reading audio.

In other words, SAVE works, and saves to a cassette tape.  However,
when I rewind, and playback, LOAD doesn't seem to do anything, even
with the cassette player volume cranked up.  (It doesn't produce any
error messages).

I have a CFFA card, and CiderPress on a computer with internet access,
so I can run other software.  I just need to find a 'cassette port'
diagnostics program, preferably in BASIC that can POKE the 6502
instructions into memory, and run them.  My 6502 coding skills are
rusty, but something reading address $C060 (casette input) detecting
the zero-crossing, then reading from C020 (the build-in speaker), to
make it click, should be all I need.

I'm thinking there's already an "Apple diagnostics" image out there
somewhere, which might be helpful in testing other parts of the
computer.

Thanks for any advice you can offer.

- Ralph