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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Summary►  ◄Detail►  ◄Timings Key►  ◄Encodings Key►
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 11110000
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 LOCK  instruction   │ lock  xchg ax,sem       │ 88/86 2
                     │                         │ 286   0
                     │                         │ 386   0
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                                    -♦-