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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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: A2031
     Operand types must match
 
     You used registers of different sizes in the same instruction, as
     in the following example:
 
                 mov     ax,bl
 
     The assembler cannot resolve such expressions, since the size of
     a register is absolutely fixed. Rewrite the instruction so that
     the registers have the same size.
                                    -♦-