Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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          >U 0x40 L 1
          39B0:0040 89C3   MOV  BX,AX
 
          >A 0x40
          39B0:0040 MOV  CX,AX
          39B0:0042
 
          >U 0x40 L 1
          39B0:0040 89C1   MOV  CX,AX
 
          >
 
     The example above modifies the instruction at address 40
     hexadecimal so that it moves data into the CX register instead
     of the BX register. The Unassemble (U) command is used to show
     the instruction before and after the assembly.
 
     You can modify a portion of code for testing, as in the example,
     but you cannot save the modified program. You must modify your
     source code and recompile.
                                    -♦-