OR               Bitwise Logical OR                             MASM Operator

expression1 OR expression2

Performs a bitwise logical OR between expression1 and expression2.
The following table shows the result of applying OR to two one-bit
numbers:

Bit      Bit      Result
0        0         0
0        1         1
1        0         1
1        1         1

See also: AND
See also: NOT
See also: XOR

OR Bitwise Logical OR