A button on the front of some Apple Macintosh computers which, when pressed, causes a command line prompt to appear. This gives access to the built-in mini-debugger, which has commands to dump memory, return to the application that was broken out, and others. A more sophisticated debugger must be installed in order to inspect breakpoints, etc.
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Programmer's SwitchThe physical buttons included with the Mac (fkey on the LC) that include a System Reset button and a Debugging button that will invoke MacsBug if present or switch to the built in monitor in ROM.
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