Ron Hudson asked:
Using a real PDP11, I suppose one would examine an address
and then start execution to boot from a hard drive? The address
being that of some fat fingered in boot loader?
(no BIOS rom eh?)
It depended on the model. The older/smaller/cheaper models
had no ROM, so you had to key in a loader. ROMs were available
as an option on those, some of them diode matrixes that could
be custom-programmed with wire cutters (!).
Later/larger configurations used to come with standard ROMs,
where you'd set on the keys a particular start address and/or
a device number.
Laler still, PDP11s came with microcoded consoles that
spoke to a console terminal instead of having proper keys
and lights.
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