TSX	TSX Transfer stack pointer to index X		TSX
Operation: S → X		N Z C I D V _ _ _ _ _ _
(Ref: 8.9)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied TSX BA 1 2

TXA	TXA Transfer index X to accumulator		TXA
Operation: X → A		N Z C I D V / / _ _ _ _
(Ref: 7.11)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied TXA 8A 1 2

TXS	TXS Transfer index X to stack pointer		TXS
Operation: X → S		N Z C I D V _ _ _ _ _ _
(Ref: 8.8)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied TXS 9A 1 2

TYA	TYA Transfer index Y to accumulator		TYA
Operation: Y → A		N Z C I D V / / _ _ _ _
(Ref: 7.14)
Addressing Mode Assembly Language Form OP CODE No. Bytes No. Cycles Implied TYA 98 1 2