SBC	Substract memory from accumulator with borrow		SBC
Operation: A - M - _C → A Note: _C = Borrow		N Z C I D V / / / _ _ /
(Ref: 2.2.2)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Immediate SBC #Oper E9 2 2 Zero Page SBC Oper E5 2 3 Zero Page, X SBC Oper, X F5 2 4 Absolute SBC Oper ED 3 4 Absolute, X SBC Oper, X FD 3 4* Absolute, Y SBC Oper, Y F9 3 4* (Indirect, X) SBC (Oper, X) E1 2 6 (Indirect), Y SBC (Oper), Y F1 2 5*
* Add 1 when page boundary is crossed.

SEC	SEC Set carry flag		SEC
Operation: 1 → C		N Z C I D V _ _ 1 _ _ _
(Ref: 3.0.1)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied SEC 38 1 2

SED	SED Set decimal mode		SED
Operation: 1 → D		N Z C I D V _ _ _ _ 1 _
(Ref: 3.3.1)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied SED F8 1 2