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No, == is not a valid operator in PBASIC.
Goya's third post hit the nail on the head: if you don't SERIN, you don't get any new data.
As for what makes an expression a condition is the presence of any of the following operators:
=
>(=)
<(=)
<>
Note that = can also be used for assignment. It's function is determined by the context in which it is used. For example:
if rc_sw1=1 then ...
uses = as a comparison operator, whereas
rc_sw1=1
uses = as the assignment operator.
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