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

[Ron Natalie via TUHS]

Different cabinetry as well.   The DEC10 has a classic tall 19” rack 
arrangement lime the PDP-11 and many other contemporary machines.
The DEC-20 has shorter cabinetry sort of like a VAX 780 only orange.


------ Original Message ------
>From "Lars Brinkhoff via TUHS" <tuhs at tuhs.org>
To "George Michaelson via TUHS" <tuhs at tuhs.org>
Date 3/24/2026 1:56:21 AM
Subject [TUHS] Re: porting to different systems, Bootstrapping UNIX - 
how was it done

>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.