This is a program to reconstruct the copy protection for Jet Set Willy (1984) for the ZX Spectrum.
It accompanies the paper
J. Aycock and A. Reinhard. Copy protection in Jet Set Willy: Developing methodology for retrogame archaeology. Internet Archaeology, 2017.
The script was written for Python 2.x, although converting the print statements into print functions should
make it runnable under Python 3.x. To run it:
% python jswdecode.py
John Aycock (aycock@ucalgary.ca)