3 Feb
2017
3 Feb
'17
9:28 p.m.
On Fri, Feb 3, 2017 at 1:17 PM, Paul Koning <paulkoning at comcast.net> wrote:
Is this actually true? I've been working on getting my PDP-11/40 running
recently, and I don't recall anything in the documentation indicating that
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.
- Josh
On Feb 3, 2017, at 4:07 PM, Josh Dersch
<derschjo at gmail.com> wrote:
On Fri, Feb 3, 2017 at 12:31 PM, Paul Koning <paulkoning at comcast.net>
wrote:
>
>
>
> I'm not sure there is one. DEC OS designers typically would assume that
> they are dealing with non-broken systems. Systems with MMU all have
EIS...
an EIS was required if you had an MMU installed.
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.
paul