sentences:  On the V80, a TLB replacement takes only 6 or 11 cycles depending on whether the page is in the same area; pipeline disruption no longer occurs in the V80 because of the separate TLB replacement hardware unit, which operates in parallel with the rest of the processor.All three processors use the same protection mechanism, with 4 protection levels set via a program status word, Ring 0 being the privileged level that could access a special set of registers on the processors.All three models support a triple-mode redundancy configuration with three CPUs used in a byzantine fault–tolerance scheme with bus freeze, instruction retry, and chip replacement signals.