Re: Vic Rabbit

From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-09-23 09:31:00

On Sun, 22 Sep 2002, Ethan Dicks wrote:

> Is there a program I can run on your C2N232 when attached to a PET
> that could sniff the format on a save?

Not yet, although it would be rather trivial to add such an option to

I used C-Kermit.  I set the line parameters to 38400,8N1, set
carrier-watch off, log session, connect.  Then I issued the *S command
on the VIC-20, got PRESS RECORD&PLAY ON TAPE, and typed ctrl-A on the
terminal program.  I got the raw data in a file "session.log".

I computed the pulse width histogram with something like "perl -e
'while(<>){s/(.)/$1\n/g;print}' < session.log | sort | uniq -c >
histogram.txt".  That file had to be viewed in Emacs, as the two
narrowest short pulses were non-printable characters, 0x1e and 0x1f
(30 and 31 times 8 microseconds, respectively).

Using the histogram, I determined what kind of pulse widths there are.
Then I translated the data in session.log to printable characters B,
C, D to be able to analyze the data.

If you can produce a raw dump (what I call "session.log" above), I can
analyze the format from it.


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