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When last we left the Apple /// emulation, we had world’s-first app compatibility but general unease over seemingly random instability in the System Utilities, and the Selector /// installer failed every time. After taking a dive into the schematics, I realized that the instruction modification trick was actually far, far simpler than I’d been giving it credit for (this is a computer released in 1980). I rewrote it according to my understanding of the schematics, which cut the size of the relevant code to about 25% of what it was before, kept compatibility high, and cured the instability.