Suspends program execution until a specified bit pattern is input from an
input port.
 
WAIT portnumber%, AND-expression% [,XOR-expression%]
 
    - portnumber%        The number of the input port.
    - AND-expression%    An integer expression that WAIT combines with the
                         bit pattern value using an AND operator. When the
                         result is nonzero, WAIT stops monitoring the port.
    - XOR-expression%    Can be used to turn line bits on and off in the bit
                         pattern before the AND operation is applied.
 
Example:
    'Reads the interrupt controller port address &H20.
    'Press any key to continue.
    WAIT &H20, 1
 
See Also    <INP, OUT>    <BOOLEAN OPERATORS>