I suppose I shall start the new topic, but may be somebody knows that already, maybe....
It is very easily to get error description in... MacsBug! (in prompt: error #-192) But, I can't invoke MacsBug (and also any other debugger like ABZmonPPC too). Yes, I can't even just enter *any* debugger, even that simply ROM's one, and can't even get Force Quit DSA dialog, and even can't click on "Restart" DSA button (on some early DSAs) just to reboot. Maybe I'm so stupid so I can't write my own "raw keycodes" file, or I'm just so stupid so I can't figure out which keys to type to get Command+Option+Power combination.
UPD: it's -192, very common Resource Manager error ("resNotFound: Resource not found"), means that there's no such resource (returned from some resource manager toolbox routine)