Commodore 128 Programmer's Reference Manual page 187

n
MACHINE LANGUAGE ON THE COMMODORE 128 177
TSX
Operation: S -> X
TSX Transfer stack pointer to index X
TSX
N Z C I D V
ADDRESSING
MODE
Implied
ASSEMBLY
LANGUAGE FORM
TSX
OP
CODE
BA
v/
NO.
BYTES
1
' / -
NO.
CYCLES
2
n
TXA TXA Transfer index X to accumulator TXA
Operation: X -> A NZCIDV
ADDRESSING
MODE
Implied
ASSEMBLY
LANGUAGE FORM
TXA
OP
CODE
8A
NO.
BYTES
1
NO.
CYCLES
2
TXS
Operation: X->-S
ADDRESSING
MODE
Implied
TXS Transfer index X to stack pointer TXS
N Z C I D V
ASSEMBLY
LANGUAGE FORM
OP NO. NO.
CODE BYTES CYCLES
TXS 9A 1
TYA
Operation: Y -* A
ADDRESSING
MODE
Implied
TYA Transfer
ASSEMBLY
LANGUAGE FORM
TYA
index Y to accumulator
N Z C
• • -
OP
CODE
98
NO.
BYTES
1
NO.
CYCLES
2
TYA