The Free On-line Dictionary of Computing (30 December 2018):

EV6
Alpha EV6

    (Alpha EV6) Compaq's bus protocol for
   Slot A motherboards.  The Alpha EV6 bus protocol is
   capable of bus speeds from 40 to 400 MHz and uses a
   point-to-point topology with clock forwarding.

   (1999-08-05)