Technically, it's "PEF", not "PEFF" (Preferred Executable Format)

[Kristine1975]

For example:

resource_dasm/src/ExecutableFormats/PEFFFile.hh

Line 17 in 59c0f31

// PEFF files have, in this order:

See Wikipedia and Mac OS Runtime Architectures chapter 8 (pdf file). peff is merely used in the PEF header. Apocryphal origin story.

[fuzziqersoftware]

I always wondered where the Joy! tag came from... seems like there should be more to that origin story :)

Anyway, I renamed PEFF to PEF in the code, and changed the corresponding CLI option in m68kdasm. I'll have to be careful not to mix up the PEFile and PEFFile classes.