For sale 128K Core RAM Industrial PDP 11/40 Massbus System
ajp166 at verizon.net
Mon Oct 31 14:49:09 CDT 2016
On 10/31/16 3:29 PM, COURYHOUSE at aol.com wrote:
> In a message dated 10/31/2016 6:36:17 A.M. US Mountain Standard Time,
> jnc at 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
> of B (inherited from its ancestor BCPL) wasn't a good match for the
> byte addressing model. More here:
>> 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).
> 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
Keep in mind that new versions of the -11 would evolve soon after
continue over time for decades.
Add to that there were both processor naming and system configuration naming
> 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
see the difference. Never mind the Unibus, Qbus, PRO, and PDT flavors.
> thanks Ed Sharpe _www.smecc.org_ (http://www.smecc.org)
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