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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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: A4057
     Illegal size for operand
 
     The size of an operand is illegal with the specified instruction.
     For instance, you cannot use a shift or rotate instruction with a
     doubleword. Since this is a warning rather than an error, the
     assembler does assemble code for the instruction, making a
     reasonable guess at your intention. For example, if the statement
 
            inc    mem32
 
     is given, where mem32 is a doubleword memory operand, the
     assembler actually only increments the low-order word of the
     operand, since a word is the largest operand that can be
     incremented. This error may occur if you try to assemble source
     code written for assemblers that have less strict type checking
     than the Microsoft QuickAssembler (such as early versions of the
     IBM Macro Assembler). Usually, you can solve the problem by
     specifying the size of the item with the PTR operator.
                                    -♦-