RE: Informations about JiffyDOS

From: Marko Mäkelä (
Date: 2001-03-16 08:15:36

On Fri, 16 Mar 2001 wrote:

> The main issue I feel is copyright vs patent.  CMD has the copyright to the
> JD code, but has the transmission protocol been patented.

I don't think so.  I searched the patent database at
<URL:> for CMD.  The search returned 31 results for
at least three different companies: Custom Machinery Design, Inc.,
Appleton, WI; CMD Electronics, Inc., Charlotte, NC; CMD Technology, Inc.,
Irvine, CA.  There was nothing about communication protocols.

> If it hasn't then provided one simply didn't copy the C64 or C128
> code, a VIC20 version of JD could be created....

How could one possibly copy the code?  It's for a different hardware.
Copyright doesn't cover ideas or algorithms; it only covers the way they
are presented.

Too bad that the C64 or C128 version of JiffyDOS can't be distributed
freely.  Someone who already has a copy of it must reverse-engineer it
(mainly detect the differences from the original KERNAL) and make the new
version.  Once a JiffyDOS compatible KERNAL for the VIC-20 is finished
(no, I'm not claiming I'd do it), it could be used as a base for
developing a JiffyDOS compatible KERNAL for the plus/4.


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