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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Warning: A4101
     Missing data; zero assumed
 
     An operand is missing from a statement, as shown below:
 
            mov    ax,
 
     Since some programmers use this syntax purposely, the message is
     a warning. The assembler assumes that 0 was intended and
     assembles the following code:
 
            mov    ax,0
                                    -♦-