Or s – Zilog Z08470 User Manual
Page 169
UM008007-0715
Z80 Instruction Description
Z80 CPU
User Manual
157
OR s
Operation
A ← A ˅ s
Op Code
OR
Operand
s
The s operand is any of r, n, (HL), (IX+d), or (lY+d), as defined for the analogous ADD
instructions. These possible op code/operand combinations are assembled as follows in
the object code:
1
0
1
1
0
r*
1
1
1
1
0
1
1
0
F6
1
0
1
1
0
1
1
0
B6
1
1
1
0
1
1
0
1
DD
1
0
1
1
0
1
1
0
B6
1
1
1
0
1
1
1
1
FD
1
0
1
1
0
1
1
0
B6
OR r*
OR n
OR (HL)
OR (IX+d)
OR (IY+d)
n
d
d