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MacsBug 6.6.0

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Year released:
[www].se [ftp].se [mirror].us [mirror].de
MacsBug_6.6.sit_.hqx (990.58 KB)
MD5: 7ab5f421ff641cd9f2877ddff9724fc4
For System 6.x - Mac OS 9
Guides on emulating older applications

When your Mac crashes, MacsBug presents you with a scary-looking screen filled with hexidecimal numbers and bad voodoo spells. Who wants that? You do. Try typing "ES" (shorthand for Exit to Shell) and pressing Enter. If you're lucky, you've returned to your Macintosh, sans whatever program it was that crashed. If your'e not lucky, you'll find yourself back in MacsBug: type "RS" and press Enter to reboot your Mac. More advanced users can try reprogramming the offender on-the-fly in memory, which can occasionally save one's hide and allow the application to continue running. All in all, it's better than the "Your Mac Has Crashed" dialog box, even for novice users.

See Also: MacsBug 6.6.3, System Error Patch, TMON, Jasik debugger (external link)

Architecture: 68k

Requirements: Works on any Macintosh from the Macintosh Plus forward.


Duality's picture
by Duality - 2018, November 11 - 9:48pm

We already have the 6.6.3 version of this (with the same Tyler Sable arguments for using it as a non-developer) at

It's "MacsBug", as in "Motorola Advanced Computer Systems Debugger", referring to its origins when it was originally developed by Motorola. Not "Mac Debugger";

Maybe it's worth having "Macbug" and "Macbugs" pages to address the obvious typos for MacsBug.

EDIT: Though this reply alone now mentions the typos. It should cover the problems in finding this very helpful tool in Garden search.