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python2vs.python3interpreters on the same Python program. New x86 CPUs always include a mode that's compatible with older CPUs (this is their only excuse for using such a convoluted hard-to-decode machine-code format!), but 386's 32-bit protected mode and x86-64's long mode really are new versions of x86 machine code. Long mode even removed some opcodes, making them invalid. \$\endgroup\$