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This was an interest article found in TPUG magazine. Which stood for the Toronto PET User Group. I don’t know how many issues there were, but I have 25 issues from Feb 1984 to Aug-Sept 1986.
To Copy Protect, or Not to Copy Protect
This was an article from GeoWorld Magazine Issue #20
ASCII & Screen Codes
plus Partner 128 and Deluxe Pain II by Electronic Arts
For The Beginner – Leroy Cheatsheet
Commodore 1541 Parallel Cable with ZoomFloppy & Burst Nibbler Demo
This is my Commodore 1541 with a parallel cable installed in it.
This video show that and how the cable works with a ZoomFloppy
and with a Commodore 64.
Silent Service uses the below ship ID from the manual for a format of copy protection.
When you start a mission you are given this screen to ID the ship: