Re: @Dwarf - Memory persistance
Having spent 2 1/2 years walking into our Uni computer room to mostly see it illuminated with 'HARDWARE FAULT' I was given access to a PDP11/20 IIRC and some FORTRAN and if I hadn't spent a few years booting other machines with similar switches I might just be able to. Even writing this I have the memory of the smell of the manuals.