11 Mar
2016
11 Mar
'16
3:09 a.m.
Thanks Don. I did read that thread previously but I will do so again in case I missed a
finer point in it.
Rich
Sent from my iPhone
On Mar 10, 2016, at 11:09 PM, Don North <north at
alum.mit.edu> wrote:
On 3/10/2016 7:02 PM, js at cimmeri.com wrote:
Creating/running an RT-11 image on a TU58 tape, and then booting/running it under TU58EM
has been
discussed in the past. I would suggest reading thru this thread, as it did succeed in
building a bootable
TU58 RT-11 image:
http://www.vcfed.org/forum/showthread.php?39372-Wanted-RT-11-OS-as-a-TU-58-…
RT-11 can run from a TU58 disk (tape) as demonstrated above, on real PDP-11 hardware.
SIMH has never directly supported mounting/attaching virtual TU58 devices. Altho the
required serial interface
is emulated (ie, a plain DL11 at 776500/300) the TU58 drive behind the serial interface
has never been emulated.
Theoretically one could attach the emulated serial port in SIMH to a real serial port
that TU58EM is connected to
(or use something like comOcom on windows to wire together virtual serial ports) and run
TU58EM with SIMH,
but I know of noone doing this (I never have, altho I believe it is technically possible
to do).
I believe that ERSATZ-11 has integrated support for TU58 image support mounting, so that
might be the way
to go to build a TU58 image under simulation.
I have seen rumblings that someone might be working on a virtual TU58 device for SIMH,
but maybe it is just
an idea at this point for a rainy day. The code would be pretty straightforward I
suspect.
Don On 3/10/2016 9:36 PM, Richard Cini wrote:
Separately? John ? the SLUs are at what I think are the standard addresses and vectors
(per the Heathkit and DLV11-J manuals) and the ODT and TU58EM work. I don?t know what
RT-11 is looking for but the console @ 177560/60 and TU58 @ 176500/300 (Channel 3 and
Channel 0 in DLV11-J parlance). I have not tried booting SIMH with the TU58 image (not
sure how to do that; need to work on it). Regarding getting a real RX01 or RL02, the issue
for me is space. It?s pretty convenient using a laptop and TU58EM (providing I can get
something other than XXDPD2D to work). If someone has already built bootable TU58 RT-11
images, I haven?t found them yet.
I have doubts that taking an RK05 image, and copying the DD: bootstrap in like that, and
then simply taking that modified RK05 image and attempting to boot it as a TU58... I'm
not sure if that could work. Just seems like there'd been some structural
differences. But I could be wrong.
I forget if either SIMH or Ersatz emulates a TU58.. but if they do, try making an empty
tape container (I think TU58EM can do this) and then build up and RT11 system as outlined
in the manual using one of the emulators. Make sure it can boot in the emulator (if
that's possible).
Do you know for sure if a real TU58 can even run RT-11? Never tried it.
p.s. you could also get yourself a qbus SCSI card, and have a much smaller disk
subsystem.
- J.