> (OTOH, there's interesting
    > arcitectural fossils - "not borrow" flags and backward subtract
    > instructions, for instance...)

    Well you should feel right at home there then.  Sounds pretty much like
    the PIC as far as the "not borrow" thing on subtracts.  Then the SUBLW
    falls nicely into the backwards subtract category.  At least the
    mnemonic is backwards from what really happens.

Well, yes, exactly.  That's what made it "intersting."  (Otherwise it would
just be "odd." :-) I don't know whether the TLCS-47 controllers are new
enough to have copied the PIC in this respect, or whether this sort of thing
is common in 4-bit microcontrollers (which in turn might help explain why
the PIC does it that way.)

BillW

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