[Coco] CoCo DECB error list and descriptions

[Lee]

Is there a list of DECB error codes ("?FE ERROR") and what they mean
anywhere online?  I just got an "?FE ERROR" (EXEC'ing some ML code I was
playing with from DECB) and can't find anything online explaining it (at
least what "FE" might stand for).  Faulty Exec?  Frackin' Excited?
Foobar'd Excellently? :)

Lee

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