Inside a DEC PDP 11/34 computer from 1978 (PWJ26)

Programming and teardown of a DEC PDP-11/34 from 1978 The Boot-ROMs on the bootloader card are funny. You need one for every device you want to boot from. The position of the roms determine the boot order. The are like pluggable device drivers. Hence the word "plugin".... (maybe :-))