17 Apr
2019
17 Apr
'19
10:24 p.m.
Are you referring to the M7238 EIS on the 11/40?
On Wed, Apr 17, 2019 at 11:45 PM Josh Dersch via cctalk <
cctalk at classiccmp.org> wrote:
On Wed, Apr 17, 2019 at 2:58 PM Paul Koning via cctalk
<
cctalk at classiccmp.org> wrote:
to
On Apr 17, 2019, at 4:36 PM, Ethan Dicks via
cctalk <
cctalk at classiccmp.org> wrote:
On Wed, Apr 17, 2019 at 2:48 PM W2HX via cctalk <cctalk at classiccmp.org
wrote:
> ?Hi friends. I am putting together a PDP-11
set up. i have a few CPUs
available to me, a 11/23+, an 11/73 and I also have
available to me an
11/83, M8190-AE .
>
> I would like to try to run as many different OS's as may interest me,
including some unixes as possible (bsd...etc). My question is, are there
any OSes that need the floating point option?
I know old UNIX (v2) needs a KE11-A or KE11-B (a Unibus peripheral
integer math option), which really wasn't something people
bought/installed in an 11/34 or later. v5, v6, and v7 UNIX shouldn't
require any sort of math hardware.
I think that was typically called "EAE" (extended arithmetic element), a
Unibus peripheral that implemented integer mul/div and maybe a few other
odds and ends. RSTS V4 had optional support for that. It only applies 11/20 and 11/05 since all the other machines have
the relevant
instructions
built into the CPU. (Later versions of RSTS
required that.)
The EAE was also an option on the 11/40.
At any rate, on the 11/73 and 83 CPU, the microcode emulates the floating
point instructions if an actual FPA isn't fitted, so everything should just
work (just a bit slower).
- Josh