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NAME	NBCD -- Negate binary coded decimal with extend
SYNOPSIS	NBCD <ea> Size = (Byte)
FUNCTION	The specified BCD number and the extend bit are subtracted from zero. Therefore, if the extend bit is set a nines complement is performed, else a tens complement is performed. The result is placed back in the specified <ea>. It can be useful to set the zero flag before performing this operation so that multi precision operations can be correctly tested for zero.
FORMAT	15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 0 0 1 0 0 0 0 0 MODE REGISTER   <ea>
RESULT	X - Set the same as the carry bit. N - Undefined. Z - Cleared it the result is non-zero, unchanged otherwise. V - Undefined. C - Set if a borrow was generated, cleared otherwise.

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