Re: PET/CBM Tape Archiving

From: Marko Mäkelä <>
Date: Sat, 6 Oct 2012 19:55:39 +0300
Message-ID: <20121006165539.GA3660@x220>
On Sat, Oct 06, 2012 at 12:39:33PM +0200, A.Fachat wrote:
>Computer option most likely matters, as each cbm had a different speed 
>- pet 1mhz, ntsc c64 and pal c64 are slightly above or below iirc etc.
>Getting the right freq will improve error rate I guess

Right, and it could be good to check a pulse width histogram display to 
see where it is best to set the thresholds for the 3 different pulse 
widths. You can do this on a *.tap file.

The C2N232 connects directly to the digital read/write lines on the 
cassette port. When I worked on the tape routines, I typed SAVE and was 
a bit surprised to see how much the pulse widths varied. The C2N232 will 
hopefully generate cleaner frequencies.

I also wrote a PCM output option for my "c2n" program and tested it by 
recording the audio to a cassette and loading it with a 1530.

One more thing that I seem to remember doing is that I connected the 
C2N232 to the digital lines from a 1530 to sample the tapes.


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Received on 2012-10-06 17:00:05

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