Commodore 128 Programmer's Reference Manual page 178

168 COMMODORE 128
DEC
Operation: M - 1 ->
ADDRESSING
MODE
Zero Page
Zero Page, X
Absolute
Absolute, X
1
M
DEC Decrement
ASSEMBLY
LANGUAGE FORM
DEC
DEC
DEC
DEC
Oper
Oper, X
Oper
Oper, X
memory
OP
CODE
C6
D6
CE
DE
by one
N
y
NO.
BYTES
2
2
3
3
Z C I
y - -
NO.
CYCLES
5
6
6
7
D V
DEC
u
DEX DEX Decrement index X by one
DEY
Operation: Y - 1 -> Y
DEY Decrement index Y by one
ADDRESSING
MODE
Implied
ASSEMBLY
LANGUAGE FORM
DEY
OP
CODE
88
y
NO.
BYTES
1
NO.
CYCLES
2
EOR
Operation : A
DEX
Operation: X - 1 -■
ADDRESSING
MODE
Implied
ASSEMBLY
LANGUAGE FORM
DEX
OP
CODE
CA
N
y
NO.
BYTES
1
z c
y -
NO.
CYCLES
2
I D V
DEY
N Z C I D V
EOR "Exclusive—Or" memory with accumulator
N Z C I D V
J s/ - - - -
EOR
LI
ADDRESSING
MODE
ASSEMBLY
LANGUAGE FORM
OP NO. NO.
CODE BYTES CYCLES
Immediate
Zero Page
Zero Page, X
Absolute
Absolute, X
Absolute, Y
(Indirect, X)
(Indirect), Y
EOR
EOR
EOR
EOR
EOR
EOR
EOR
EOR
#Oper
Oper
Oper, X
Oper
Oper, X
Oper, Y
(Oper, X)
(Oper), Y
49
45
55
4D
5D
59
41
51
2
2
2
3
3
3
2
2
2
3
4
4
4*
4*
6
5*
: Add 1 if page boundary is crossed.
u
U