Subtracts one from the value held at a specified memory location setting the zero and negative flags as appropriate.

C 	Carry Flag 	  Not affected
Z 	Zero Flag 	  Set if result is zero
I 	Interrupt Disable Not affected
D 	Decimal Mode Flag Not affected
B 	Break Command 	  Not affected
V 	Overflow Flag 	  Not affected
N 	Negative Flag 	  Set if bit 7 of the result is set

Dec is referenced in 1 repository