Zane H. Healy wrote:
At 9:13 PM
-0700 4/21/11, CRC wrote:
A friend desires to leave the hot desert this
summer and move to the
cool mountain and yet maintain contact with his PDP11 with which he
still runs his business. He has a rotten phone connection, but good
internet. He runs a highly modified version of RTST 5x and cannot
reasonably move his stable 30 y/o applications to later/other OS's. I
would appreciate knowing what the listers use to accomplish same.
I would recommend running the E11 PDP-11 emulator on a laptop. Though
based on what you describe, I think SIMH could work just as well.
Honestly I'd recommend moving it over to an emulator anyway if he's
running his business off of it. It's one thing for those of us here
to run PDP-11 hardware of that vintage as a hobby, it's another thing
to depend on it for your livelihood. What type of drives is he using?
I strongly agree with Zane that a shift to an emulator should
be done if at all possible.
My assumption is that the actual operating system is RSTS/E V5.x
which probably runs on RL01 / RL02 drives based on 1980 type
hardware. RX01 / RX02 floppy disk drives were also popular.
Both E11 and SIMH support these hardware devices. However,
if your friend is using disk drives which are non-standard from DEC
hardware, then all bets are off.
The other area of concern is the terminal interface. E11 offers
support for VT100 emulation built into the emulator. SIMH
does not.
Finally, there is the cost. Since your friend is running a commercial
for profit system, switching to new hardware legally requires a
new license. More difficult will be the question of where to send
a cheque to to pay for the license since Mentec no longer operates
in a transparent mode.
In addition, while SIMH is free, E11 is licensed software and requires
a license to be purchased for commercial systems. If your friend
does switch to E11, the increased productivity and decreased costs
of operation should pay for the move in a few years.
The following webpage desperately needs updated, but
should point you
in the right direction.
http://www.aracnet.com/~healyzh/pdp11emu.html
While I could help with an RT-11 system, RSTS/E is
beyond my knowledge base. If you specify the hardware
environment (disk drives, terminals and internet), additional
suggestions can be made.
Jerome Fine