10 Mar
2016
10 Mar
'16
8:09 p.m.
On 3/10/2016 7:02 PM, js at cimmeri.com wrote:
On 3/10/2016 9:36 PM, Richard Cini 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
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.