The MicroVAX wasn't ever a personal computer really: the MicroVAX was a pretty expensive minicomputer (in about '87 a base uVAX-II was around $30k) which stood on the floor and make wooshing noises. It did use LSI/VLSI chips though. The VAXstation was the personal version - later ones used MIPS chips. I became a qualified VMS sysadmin in '87 to look after a uVAX II, which did less than a MIP. Used QBUS expansion cards, like bigger VAXes.