On Wed, Apr 17, 2019 at 2:48 PM W2HX via cctalk <cctalk@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.

Simple OSes like RT-11 do not require it and the The usual DEC
timesharing OSes (RSX-11, RSTS/E...) won't require it,, though you may
encounter a FORTRAN application that was compiled to require it.

-ethan

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