Re: cassette port dongle

From: Marko Mäkelä (
Date: 2006-08-27 16:42:49

On Sun, Aug 27, 2006 at 03:43:30AM +0000, William Levak wrote:
> Dongles have a capacitor and transistor across several of the lines, so 
> that a signal output on one line that will appear a short tome later 
> (determined by the capacitor) on a different line (determined by the 
> transistor). The actual lines are different for each dongle.

The dongle for the Leaderboard golf game really only consists of a
card edge connector and a resistor connected across two lines.  I'd
assume that the lines are SENSE and GND, but it was 20 years ago.

I have one dongle, used by a compiled BASIC program on the PET.
I removed the protection with the help of VICE.  It wasn't trivial,
because the compiled BASIC code was a mess.  Also, the program computed
a checksum over itself.  Anyway, I succeeded, and I got the PET, printer
and disk drive for my effort.  The company now uses the program on a PC
running VICE.


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