Well, obviously COPOS/11 isn't P/OS, as you later noted. :-)

P/OS was the OS for the DEC Professions. Came in three models. 325, 350
and 380.

The 325 and 350 were F-11 based. 325 only had RX50 floppies, while the
350 had a harddisk.
The 380 used the J11 CPU, but sadly at a low speed and without cache.
And all software had to work with the F11 as well, so none of the J11
improvements were used.

Basically, the Professional was a good idea implemented rather badly.

And P/OS was a very bastardized version of RSX-11M-PLUS. Again, a good
idea done badly. Menu driven, and weird. And not entirely compatible
with the rest of the RSX family.

All done so that the PRO would not compete against the PDP-11 machines.

The Rainbow was the second prong of the DEC PC attempt. It was the one
that was almost IBM compatible, but not quite. It had a Z80 and an 8086,
and originally was running both CP/M-80 and -86, but later ran a version
of DOS as well.

Third prong was the DECmate, which was PDP-8 based.

   Johnny

On 2022-10-22 04:28, Thomas DeBellis wrote:
> I believe it is for the menu-driven version of RSX that ran on DEC's
> PDP-11 based PC.  I believe it was branded "POS" something, but I don't
> remember what those letters meant.  We had our own local inappropriate
> meaning of the acronym, which I won't repeat here as, nearly four
> decades after the fact, I'm really embarrassed by our arrogance. 
> Anyway, our word has blotted out whatever it meant...
>
> What I remember is that the the keyboard drove my manager of the time,
> Frank da Cruz (or Mr. Kermit) absolutely bonkers as he attempted to
> test/bring up Kermit on it.  He /really/ didn't like the "Do" button. 
> Whenever Kermit hung the machine (which was frequently in early
> versions), he would would windmill his right arm, swooping down and
> pushing the button, intoning "Do. Do.. Do...  DO!" until he had to
> reboot/repower.  He got pretty peeved.
>
> I forget the product name, but it wasn't Rainbox; that was an 8086 or
> something.
>
> On 10/20/22 5:25 PM, Lee Gleason wrote:
>> On 10/20/2022 3:38 PM, Johnny Billquist wrote:
>>> Hmm. Oops. I have to correct myself, as well as Thomas.
>>> Looking at the RSX code, the system types are defines as such:
>>>
>>
>>>
>>> OS$COP'B'= 13.                  ; COPOS/11
>>
>>
>>   Anyone know what COPOS/11 refers to?
>>
>> ==
>> Lek K. Gleason N5ZMR
>> Control-G Consultants
>> lee.gleason@comcast.net
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--
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt@softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol
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