unix developed on 11/20 with 20 on panel or machine that just said pdp/11? - test-drb@ccmp.vtda.org

21 Jun 2019

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