These are reference charts to trouble shoot your Commodore C-64 and 1541.
I have version Reference #4 and Reference #6
Grave Yard is a different kind of football game.
For the disk copy protection you are asked for a STAT out of the manual.
Commodore 64 Cartridge Port Repair.
My main C64 would NOT play a number of cartridges, especially Atarisoft cartridges like Centipede, Dig-Dug, Robotron and Pac-Man. So I filmed the process of replacing the port. Hope the video can help someone else with cartridge problems.
Here is an Accolade Copier I found on the back of my 21-Second Backup disk
GEOS – Leroy Cheatsheet
This is a nice one with a ton of info for you.
The PDF is here: Geos-card
The Jpeg is below: