[HECnet] This is probably been asked already but....

[Steve Davidson]

-----Original Message-----
From: owner-hecnet at Update.UU.SE 
[mailto:owner-hecnet at Update.UU.SE] On Behalf Of Paul_Koning at Dell.com
Sent: Monday, July 02, 2012 14:07
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] This is probably been asked already but....


On Jul 2, 2012, at 11:47 AM, Johnny Billquist wrote:

On 2012-07-02 16:40, Paul_Koning at Dell.com wrote:

On Jul 2, 2012, at 10:21 AM, Bob Armstrong wrote:

...
RSX-11S was the "embedded system OS" of the PDP-11 world 
(at least 
as far as DEC's offerings went).

That and RT-11.   And MicroPower-Pascal, of which I know 
nothing apart from its name.   Was that the RTOS used with the 
T-11 (the first single-chip PDP-11?)   I seem to remember that 
it was used as the RTOS in the LA-120 printer.   Having a real 
OS allowed it to do fancy stuff like bidirectional printing, 
the first DEC printer to do so.

I'm not sure how practical the other ones were as embedded 
systems. The big point with RSX-11S is that it's all just one 
binary for the whole system. There are no disks. In fact, you 
can't even have things on disk in the sense that you think 
for other systems.
Without disks, you could put this all on PROM, flash, or 
whatever. Or (which I think was more common), download from 
the net, and then run.

As far as I know, RT likes a disk, or something disklike, 
such as DECtape (real or even the fake "DECtape II").   But 
Micropower, I'm pretty sure, is a deep embedded system that 
runs from ROM/RAM.

	paul




MRRT-11 (Memory-Resident, RT-11) is what you are trying to think of.
You needed an RT-11 license for the load (and create) host, then
licenses for each MRRT-11 system.   I used this when I was a DEC OEM for
a while.

-Steve