MicroBug
From Applepedia
MicroBug was the built-in debugger in the Classic MacOS. It appeared on a debug interrupt if no other debugger (such as MacsBug) was installed. The MicroBug has a few simple commands to edit, view and execute memory contents, as well as displaying the contents of the registers.
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More Reading
- Apple Developer Technote 1136 - details and command listing
