18-bit	PDP-1 PDP-4 PDP-7 PDP-9 PDP-15
12-bit	LINC LINC-8 PDP-5 PDP-8 PDP-8/e PDP-12 DECmate PDP-14

36-bit	PDP-6 PDP-10 DECSYSTEM-20
16-bit	PDP-11 DEC Professional