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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Error: A2075
     Illegal use of undefined operand (?)
 
     The undefined operand (?) was used incorrectly. For example, the
     following statements are illegal:
 
     stuff     DB     5 DUP (?+5) ; Can't use in expression
               mov    ax,?        ; Can't use in code
                                    -♦-