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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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: A2057
     Illegal size for operand
 
     You attempted to use an instruction with a register of the wrong
     size, as in the following example:
 
            jmp    ah
 
     The assembler cannot resolve such an instruction, because the
     size of a register is absolutely fixed. In the example above, you
     could correct the instruction by replacing AH with AX.
                                    -♦-