RL02 version of UNIX6?

Paul Koning paulkoning at comcast.net
Fri Feb 3 15:35:42 CST 2017

> On Feb 3, 2017, at 4:28 PM, Josh Dersch <derschjo at gmail.com> wrote:
> On Fri, Feb 3, 2017 at 1:17 PM, Paul Koning <paulkoning at comcast.net> wrote:
>> ...
>> What I meant is that the 11/40 has EIS standard, according to the PDP11
>> architecture handbook.  So an OS that depends on MMU would be designed for
>> 11/40, 11/45, etc. all of which have EIS.  And since EIS instructions are
>> quite helpful they will be used.  Not necessarily MUL, in a kernel, but
>> definitely SOB.
> EIS was an option on the 11/40, it was not standard.
> https://pdos.csail.mit.edu/6.828/2005/readings/pdp11-40.pdf, section 2.4.

I saw that stated earlier, too, but DEC's PDP11 architecture handbook doesn't appear to confirm that.  Either that or the model differences table is sloppy.


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