In article <200556173457.175529@notabob>, stuart@brook.ca says...
> On Fri, 06 May 2005 11:04:40 -0400, will kranz wrote:
>
> >*Its my understanding that the Vax-750 had some sort of
> >*compatibility mode for RT11 (or is it generic 16 bit addressing)?
> >*Anyone know how to access and or control this? *My diagnoistics
> >*tapes and consol tapes seem to be in RT11 format, not files11,
> >*although the home block format string is "DECVMSEXCHNG". *If I
> >*could run it as a PDP11 off the functional RL02 I might get further
> >*figuring out why the RA80 doesn't work.
>
> What runs on VMS are two host packages
>
> VAX-11/RSX which sets up the host resources to run non-priv
> RSX-11 task images so you can do task development and was commonly
> used for RSX-11S development.
>
> VAX-11 RTEM which sets up the host resources to run RT-11 SJ
> software that doesn't touch hardware. Many parts of RT-11 were
> maintained for several years on RTEM.

For completeness' sake, there is/was also ROSS/V, which does the
same thing for RSTS/E user-mode programs.

VAX-11/RSX was a DEC product and now belongs to Mentec.

VAX-11 RTEM was also a DEC product, but I don't know what happened
to it.

ROSS/V is an EGH product.

--
John

On Sun, 08 May 2005 07:17:59 GMT, John Santos
wrote:

>In article <200556173457.175529@notabob>, stuart@brook.ca says...
>> On Fri, 06 May 2005 11:04:40 -0400, will kranz wrote:
>>
>> >*Its my understanding that the Vax-750 had some sort of
>> >*compatibility mode for RT11 (or is it generic 16 bit addressing)?
>> >*Anyone know how to access and or control this? *My diagnoistics
>> >*tapes and consol tapes seem to be in RT11 format, not files11,
>> >*although the home block format string is "DECVMSEXCHNG". *If I
>> >*could run it as a PDP11 off the functional RL02 I might get further
>> >*figuring out why the RA80 doesn't work.
>>
>> What runs on VMS are two host packages
>>
>> VAX-11/RSX which sets up the host resources to run non-priv
>> RSX-11 task images so you can do task development and was commonly
>> used for RSX-11S development.
>>
>> VAX-11 RTEM which sets up the host resources to run RT-11 SJ
>> software that doesn't touch hardware. Many parts of RT-11 were
>> maintained for several years on RTEM.
>
>For completeness' sake, there is/was also ROSS/V, which does the
>same thing for RSTS/E user-mode programs.
>
>VAX-11/RSX was a DEC product and now belongs to Mentec.
>
>VAX-11 RTEM was also a DEC product, but I don't know what happened
>to it.
>
>ROSS/V is an EGH product.

And for completeness completeness sake I did an RT-11 compatible AME
which I used to market as VRT -- we sold very few but I used for
development. It used my monitor sources, not the DEC code, and it
worked as an AME permitting RT-11 programs to be run directly IIRC.
The main advantages over RTEM were, (a) RTEM wasn't available when I
first did it, (b) it ran out of VMS directories, not an RT-11 logical
disk.

(I refashioned it ten years ago to provide the same kind of service
under the first version of my Windows PDP-11 emulator.)

paramucho wrote:
> On Sun, 08 May 2005 07:17:59 GMT, John Santos
> wrote:
>
> >In article <200556173457.175529@notabob>, stuart@brook.ca says...
> >> On Fri, 06 May 2005 11:04:40 -0400, will kranz wrote:
> >>
> >> > Its my understanding that the Vax-750 had some sort of
> >> > compatibility mode for RT11 (or is it generic 16 bit
addressing)?
> >> > Anyone know how to access and or control this? My
diagnoistics
> >> > tapes and consol tapes seem to be in RT11 format, not files11,
> >> > although the home block format string is "DECVMSEXCHNG". If I
> >> > could run it as a PDP11 off the functional RL02 I might get
further
> >> > figuring out why the RA80 doesn't work.
> >>
> >> What runs on VMS are two host packages
> >>
> >> VAX-11/RSX which sets up the host resources to run non-priv
> >> RSX-11 task images so you can do task development and was commonly

> >> used for RSX-11S development.
> >>
> >> VAX-11 RTEM which sets up the host resources to run RT-11 SJ
> >> software that doesn't touch hardware. Many parts of RT-11 were
> >> maintained for several years on RTEM.
> >
> >For completeness' sake, there is/was also ROSS/V, which does the
> >same thing for RSTS/E user-mode programs.
> >
> >VAX-11/RSX was a DEC product and now belongs to Mentec.
> >
> >VAX-11 RTEM was also a DEC product, but I don't know what happened
> >to it.
> >
> >ROSS/V is an EGH product.
>
> And for completeness completeness sake I did an RT-11 compatible AME
> which I used to market as VRT -- we sold very few but I used for
> development. It used my monitor sources, not the DEC code, and it
> worked as an AME permitting RT-11 programs to be run directly IIRC.
> The main advantages over RTEM were, (a) RTEM wasn't available when I
> first did it, (b) it ran out of VMS directories, not an RT-11 logical
> disk.
>
> (I refashioned it ten years ago to provide the same kind of service
> under the first version of my Windows PDP-11 emulator.)

For completeness completeness completeness sake, I developed something
very similar: basically an EMT handler that implemented a reasonable
subset of RT-11 system calls under RSX-11M or VAX-11/RSX. Again, it was
before the birth of RTEM. It enabled me to work on RT-11 projects
without booting all the users off our multiuser machine or burning too
much midnight oil. We didn't sell it, but I think it may be on a SIG
tape somewhere.

Chris

There was also an RT-11 emulation available for PDP-11 Unix,
avaiable commercially from HCR of Toronto. We used it for
running ADVENTure and for MACRO-11/LINK-11 to support some
apps that would have been too costly to rewrite for Unix.