[TUHS] Bootstrapping UNIX - how was it done

[Noel Chiappa via TUHS]

    > From: Ron Minnich

    > toggle in an address that was owned by the diode rom, 177400, whatever

The 'magic number', 773030, which had to be left in the front console
switches for the system to come up single-user (in early UNIX versions), was
in fact an address in the BM792 ROM - clearly the address used to start the
'start from powered off' bootstrap on their machine!

    > I believe if you left HALT set, you could step it through the diode
    > romK

That was the incantation to give to the front console of PDP-11's that had
one to cause it to single step.

	Noel