Weak Bits were a really big thing on the Apple II, going back to 1982 or before. It’s worth checking some of the 4am crack logs (like this one: The Kingdom of Facts) for the details. It seems that Datasoft did it with a modified C64 drive attached to an Apple II.
Way-back-when, In the days where copying was just a thing, I had a piece of hardware that could replicate most of the protection schemes. It was 8 bit and amazing The Copy-2-PC Option board