ot found, the input file is skipped until an ENDIF
or ELSE directive is found.

<P>Lines that are skipped over still appear in the listing file, but a
'~' will appear immediately after the current PC and no object code will
be generated (this is applicable to IFDEF, IFNDEF, and IF).
<H2>
<A NAME="IFNDEF"></A>IFNDEF</H2>
The IFNDEF directive is the opposite of the IFDEF directive. The block
of code following is assembled only if the specified <I>macro_label</I>
is undefined. It has the following form:
<PRE>&