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The Mac from that era had a built-in hardware debugger. Literally pressing the button on the front of the case dropped you straight into Macsbugs. Something I used extensively to crack software copy protection.

If you knew Macsbugs, ResEdit and Codewarrior you had complete control of your software and hardware.

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>>Literally pressing the button on the front of the case dropped you straight into Macsbugs.

Or better yet, TMON[1]! What an amazing debugger. I spent many hours in there, trying to figure out why the 64K ROM was stepping all over registers that were supposed to be protected by particular ROM traps. (to be fair, there were not too many of these, and they were all eventually patched by system updates)

[1] https://www.macintoshrepository.org/1400-tmon

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