14 Jul
2010
14 Jul
'10
11 a.m.
"Jerome H. Fine" <jhfinedp3k at compsys.to> wrote:
I have fixed some of the bugs in a program which runs
under RT-11
(obviously using the
PDP-11 instruction set - since actual DEC PDP-11 hardware can be
replaced by either
other compatible hardware on an emulator such as SIMH or E11).
The bugs were causing problems when the program was run under VBGEXE,
especially
when the program was run as a system job.
The requirements for the changes and additions to the RT-11 code have
been determined.
However, the same program is expected to run under RSTS/E (using SWITCH
RT11),
TSX-Plus (which is fully compatible) and RTEM-11. It is this last
expectation for which I
have been unable to find any documentation, let alone any ability to
test the program. Does
anyone who is reading this know where there might be documentation
available concerning
how RTEM-11 handles RT-11 EMT requests? In addition, does anyone know
of any
systems currently running which support RTEM-11 features which allow
RT-11 programs
to run in that environment? My assumption is that VMS on a VAX
supported RTEM-11
at some point, but perhaps (if I am correct) the RTEM-11 support was not
continued with
more recent versions of VMS on the VAX and most definitely VMS on the
Alpha. Can
anyone comment on these questions?
As far as I know, RTEM-11 will not run under VMS.
It was a product for RSX-11M (only). Long since retired now, and I don't
have any details on it. However, I seem to remember that when you do an
-11M SYSGEN, you still get a question for some RTEM-11 support to be
included in the system.
As expected, it will trap RT11 EMTs, but exactly what it will do for
specific EMTs, and in which cases it might differ from RT11, I have no
idea. It's probably also not compatible with any "recent" changes to
RT11, just so that you know...
Johnny