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  Arguments
 
    vector_number     Integer expression representing an interrupt
                      number in the range $0..$FF (decimal 0..255)
 
    vector_address    Pointer to an interrupt procedure
 
  Description
 
    The SetIntVec procedure sets a vector address for a specified
    interrupt number. An interrupt vector is the address of an
    interrupt procedure. When an interrupt occurs, the system executes
    the procedure.
 
    The vector_number argument is a byte containing an interrupt
    number.
 
    The vector_address argument is the address of an interrupt routine.
    Pass the address either by using the Ptr function to set a pointer
    to the desired address, or by using the at-sign operator (@) or the
    Addr function to get the address of a procedure.
 
    Use the GetIntVec procedure to save the old interrupt number before
    installing a new interrupt handler with SetIntVec. If a program
    changes an interrupt vector, it must restore it before terminating.
 
    An interrupt procedure must be declared with the INTERRUPT modifier.
    The procedure may only be called by an interrupt.