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Increment/Decrement Instructions Section 5-24
DEC(39) works the same way as INC(38) except that it decrements the value
instead of incrementing it.
Precautions The content of Wd will be decremented every cycle if the undifferentiated form
of DEC(39) is used. Use the differentiated form (@DEC(39)) or combine
DEC(39) with DIFU(13) or DIFD(14) to decrement Wd just once.
Flags ER: Wd is not BCD.
Indirectly addressed DM word is non-existent. (Content of *DM word
is not BCD, or the DM area boundary has been exceeded.)
EQ: ON when the decremented result is 0.
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