Add memory to Accumulator
Memonic	Mode	Opcode	Cycles	Bytes
ADDA	Immediate	8B	2	2
	Direct	9B	3	2
	Indexed	AB	5	2
	Extended	BB	4	3
ADDB	Immediate	CB	2	2
	Direct	DB	3	2
	Indexed	EB	5	2
	Extended	FB	4	3

A = A + M
B = B + M

Results:
H set on carry from bit 3
N set if bit 7 is 1
Z set if all bits are 0
V set on 2's complement overflow
C set on carry from bit 7