Re: cassette port dongle

From: Cameron Kaiser (
Date: 2006-08-28 03:29:46

> > 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.

I'm curious -- what was the nature of the program? They sure wanted to
get it running quite badly, it sounds.

--------------------------------- personal: ---
  Cameron Kaiser * Floodgap Systems * *
-- I can't type any long sentiments in this .sig file because it's not wide enou

       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail pre-2.1.8.