sentences:  In addition, a recovery method for the mismatched instruction—either "roll-back by retry" or "roll-forward by exception"—can be selected via an external pin.The work on V60 processor began in 1982 with about 250 engineers under the leadership of Yoichi Yano, and the processor debuted in February 1986.It had a six-stage pipeline, built-in memory-management unit, and floating-point arithmetic.