From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2006-08-27 05:43:30
On Sat, 26 Aug 2006, Glenn Holmer wrote:
> Date: Sat, 26 Aug 2006 09:15:40 -0500
> From: Glenn Holmer <gholmer@ameritech.net>
> Reply-To: cbm-hackers@ling.gu.se
> To: cbm-hackers@ling.gu.se
> Subject: cassette port dongle
>
> I have a piece of software that uses a cassette port dongle (KMMM
> Pascal), and would like to make an unprotected copy of it. What should
> I be looking for in terms of register reads &c. that they would be
> using to detect the dongle?
>
You don't say which computer it is for.
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.
You are looking for a short machine language routine that outputs to the
cassette port, and then waits for a reply.
----------
I have a dongle for a piece of software, where I have scraped the plastic
off the dongle. This damaged the compnents, but I was able to
read the markings and determine what they were, and replace them with
working components.
Correction! I HAD such a dongle. I just went to look for it and cannot
find it. At any rate, I have long since removed the machine language
routine that accessed it.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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