[TUHS] porting to different systems, Bootstrapping UNIX - how was it done

[Lars Brinkhoff via TUHS]

George Michaelson wrote:
> In like sense TOPS-10 was ported from the 10 to the 20 but that was at
> worst a marginal conversion.

DEC-10 and DEC-20 are largely only different names for the same machine.
A DEC-10 comes with TOPS-10, and a DEC-20 comes with TOPS-20.  Depending
on operating system version, the microcode may differ with regards to
monitor functions.