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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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: A2063
     Operand combination illegal
 
     Two operands were used with an instruction that does not allow
     the specified combination of operands. For example, the following
     operand combination is illegal:
 
            xchg    mem1,mem2
                                    -♦-