On Thu, 2 Mar 2023 12:45:50 +1100, Chris Angelico <ros...@gmail.com>
declaimed the following:
>
>As have all CPUs since; it's the only way to implement locks (push the
>locking all the way down to the CPU level).
>
Xerox Sigma (circa 1970): Modify and Test (byte/halfword/word)
Granted, that was a "mainframe" system, not a microprocessor.
Looks like Intel didn't catch the boat until 1985 and the i386.
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