SEI	SEI Set interrupt disable status		SEI
Operation: 1 → I		N Z C I D V _ _ _ 1 _ _
(Ref: 3.2.1)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied SEI 78 1 2

STA	Store accumulator in memory		STA
Operation: A → M		N Z C I D V _ _ _ _ _ _
(Ref: 2.1.2)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Zero Page STA Oper 85 2 3 Zero Page, X STA Oper, X 95 2 4 Absolute STA Oper 8D 3 4 Absolute, X STA Oper, X 9D 3 5 Absolute, Y STA Oper, Y 99 3 5 (Indirect, X) STA (Oper, X) 81 2 6 (Indirect), Y STA (Oper), Y 91 2 6

STX	Store index X in memory		STX
Operation: X → M		N Z C I D V _ _ _ _ _ _
(Ref: 7.2)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Zero Page STX Oper 86 2 3 Zero Page, Y STX Oper, Y 96 2 4 Absolute STX Oper 8E 3 4