Spare Change is an odd little Apple II game from 1983, where the player tries to thwart mischievous creatures who escaped from an arcade game, who are trying to steal quarters from the machines. One of Broderbund’s earlier hits, although it never gained the recognition of Lode Runner.
Spare Change, in addition to its various little features like animated intermissions and customizable difficulty, also had a pretty strong copy protection scheme. These schemes served to prevent casual copying at the time (although cracks of all the popular titles inevitably started making the rounds on BBSes), but also serve to work against software preservation. Spare Change is 40 years old now, and disks fail frequently. There is an available crack, but it’s said to be missing an important feature: it fails to save their high scores to disk.
4am is the famed preserver of classic Apple II software, performed by dint of figuring out their protection and removing it as unobtrusively as possible. His account on Twitter (I refuse to call it X, I don’t even like saying Xbox) made for great reading for people of a technical mind. He isn’t on Twitter any more for, I dunno, some reason, but he still posts his cracks, and his explanations for how they work, to the Internet Archive, under the 4am tag.
All this is to say his crack of Spare Change makes for entertaining reading to one of the right mindset. One of you may have it, so here it is.