Radio Shack TRS-80 PC-3

"ABCDEF" = "ABCDEF"
"ABCDEF"
<>"ABCDE"
"ABCDEF"
>"ABCDE"
Relational expressions are either True or False. The PC-3 represents True by a 1; False is represented by a 0. In any logical test,
an expression which evaluates
to 1 or more will be regarded as True, while one which evaluates to 0 or less will be considered False.
Good programming practice, however, dictates the use of
an explicit relational expression instead of relying on this coincidence.
Logical Expressions
Logical expressions are relational expressions which use the operators AND, OR, and NOT. AND and OR are used to connect two
relational expressions; the value of the combined expression
is shown in the following tables:
A AND
B
Value
of
B
A OR B
Value
of
B
Value of A
True
False
True True False
False False False
Value of A
True
False
True True True
False True
False
(Cf. Values of A and B must be
0 or 1)
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