On 10/31/16 3:29 PM, couryho...@aol.com wrote:
In a message dated 10/31/2016 6:36:17 A.M. US Mountain Standard Time,
j...@mercury.lcs.mit.edu writes:
From: Ed Sharpe
was Unix or C the one developed on the 11/20?
Both. Unix Version 1 was written in PDP-11 assembler, for the -11/20;
although that was a re-write of an earlier version written in PDP-7
assembler. C was developed from B in good part because the word address
model
of B (inherited from its ancestor BCPL) wasn't a good match for the
PDP-11's
byte addressing model. More here:
https://www.bell-labs.com/usr/dmr/www/hist.html
https://www.bell-labs.com/usr/dmr/www/chist.html
From: Christian Corti
I think the IP stack needs separate I/D and more memory
I read that the networking code in 2.x uses Supervisor mode (apparently it
needed more address space than was available with only kernel, even with
split I/D).
Noel
Great History Noel! Many Thanks!
...
I wonder if the pdp-11 was just called pdp-11 at t that point or
was a pdp-11/20 like we have..
At that time PDP-11 was a general architecture name and 11/mumble was a
specific system.
Keep in mind that new versions of the -11 would evolve soon after
introduction and
continue over time for decades.
Add to that there were both processor naming and system configuration naming
conventions.
I know they are essentially the same at this time point they got
their PDP 11 what did it say on the front panel I wonder?
(figuring all this stuff out for titling up the cards in the 11/20
display we are planning.)
Find a copy of the PDP-11 systems handbook! Say 1978, 80 and 82
versions and
see the difference. Never mind the Unibus, Qbus, PRO, and PDT flavors.
Allison
thanks Ed Sharpe _www.smecc.org_ (http://www.smecc.org)
