THE
80286
INSTRUCTION SET
OR
- Logical Inclusive
OR
Opcode Instruction Clocks
08
Ir
OR eb,rb
2,mem=7
09
Ir
OR eW,rw
2,mem=7
OA
Ir
OR rb,eb
2,mem=7
08
Ir
OR rw,ew
2,mem=7
OC
db OR AL,db
3
00
dw
OR AX,dw 3
80
11
db
OR eb,db
3,mem=7
81
11
dw
OR eW,dw
3,mem=7
FLAGS MODIFIED
Overflow=O, sign, zero, parity, carry=O
FLAGS UNDEFINED
Auxiliary carry
OPERATION
Description
Logical-OR byte register into
EA
byte
Logical-OR word register into
EA
word
Logical-OR
EA
byte into byte register
Logical-OR
EA
word into word register
Logical-OR immediate byte into AL
Logical-OR immediate word into
AX
Logical-OR immediate byte into
EA
byte
Logical-OR immediate word into
EA
word
This instruction computes the inclusive
OR
of the two operands. Each bit of the result
is
0 if both
corresponding bits of the operands are
0;
each bit
is
1 otherwise. The result
is
placed
in
the first
operand.
PROTECTED MODE EXCEPTIONS
#GP(O) if the result
is
in
a non-writable segment.
#GP(O)
for an illegal memory operand effective
address in the CS, DS,
or
ES segments;
#SS(O)
for an illegal address
in
the SS segment.
REAL ADDRESS MODE EXCEPTIONS
Interrupt
13
for a word operand at offset OFFFFH.
8-80
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