Committing so others can look at it.
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Got p2bin to produce the whole ROM.
Fixing all jmp/jsr to use explicit long addressing, fixing even to use align0.
Fixing remaining issues.
Fixing exg instruction.
Sound driver comments and corrections

I equated some unequated a6 references.
Pointed out a bug or two.
Added some comments.
Corrected/expanded some comments and labels.
Pointed out some redundancies and how to be rid of them.