This instruction subtracts the contents of a memory location to the accumulator together with the not of the carry bit. If overflow occurs the carry bit is clear, this enables multiple byte subtraction to be performed.

C 	Carry Flag 	  Clear if overflow in bit 7
Z 	Zero Flag 	  Set if A = 0
I 	Interrupt Disable Not affected
D 	Decimal Mode Flag Not affected
B 	Break Command 	  Not affected
V 	Overflow Flag 	  Set if sign bit is incorrect
N 	Negative Flag 	  Set if bit 7 set

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