unix developed on 11/20 with 20 on panel or machine that just said pdp/11?

[Warren Toomey]

Paul Koning wrote:

>> The 1971 Unix Programmer's Manual mentions their 11/20 had 24 KB
>> (surely KW?) memory rather than 28KW.

> I would assume kW.  In the PDP11 world we didn't normally speak of
> bytes or kbytes, certainly not for memory and often not elsewhere either.

The PDP-11 Unix source:
https://github.com/DoctorWkt/unix-jun72/blob/master/pages/e00-01
says:

orig = 0
core = orig+40000 / specifies beginning of user's core
ecore = core+20000 / specifies end of user's core (4096 words)

So: 40000= 16KB for the kernel, 20000= 8KB for the user program.

Cheers, Warren