 The VAX 8600 was the last VAX to be 100% compatible with the VAX-11/780 and VAX-11/785, to have the PDP-11 compatibility mode, and to use the SBI also used by the VAX-11/78x.The CPU had a 55 ns cycle time (18.18 MHz).The VAX 8200 and VAX 8300, code named ""Scorpio"", were mid-range minicomputers introduced on 29 January 1986.