The complement operator (^C)  produces the one's complement of
    the specified value.

    FORMAT
    ^Cterm

 term

    Any term or expression. If an expression is specified, it must be
    enclosed in angle brackets.

    MACRO-64 evaluates the term or expression as an 8-byte value
    before complementing it. For example:

    .LONG      ^C^XFF      ; Produces FFFFFF00 (hex)
    .LONG      ^C25        ; Produces complement of
                           ;   25 (dec) which is
                           ;   FFFFFFE6 (hex)