Which RT-11 for an 11/03

Richard Cini rich.cini at verizon.net
Thu Mar 10 13:28:22 CST 2016

Thanks Mattis. The system in question has 32kw of memory and it does pass the memory test. 

I have not tried to boot the resulting DD image on SIMH but the original RK image does boot. 

I feel I'm close but I'm missing something. I may try 5.3 instead. 


Sent from my iPhone

> On Mar 10, 2016, at 2:15 PM, Mattis Lind <mattislind at gmail.com> wrote:
> 2016-03-10 18:51 GMT+01:00 Richard Cini <rich.cini at verizon.net>:
>> Is there a listing somewhere of what versions of RT-11 work with which
>> CPUs? The Heath H11 uses the LSI-11 which I think is an 11/03 equivalent.
>> Is there a specific version (or maximum version) designed for this CPU?
> I have been using RT11 v5.3 on a LSI-11/2 (KD11-HA / M7270) machine with
> RX02 and 64kByte memory. I also tried RT11 V3B / MU-BASIC on this machine
> booting from RX02.
> http://www.datormuseum.se/computers/digital-equipment-corporation/pdp1103-l
> Long ago I ran RT11 V4 on a VT103 with LSI11/2 CPU and dual TU58. It was
> really very slow. I have the distribution kit somewhere on original TU58
> but I am not sure about the state of those cassettes.
> So I am pretty convinced that the it should work. What about SimH or
> Ersatz-11? Does your image boot on those simulators if you set the up
> identical to your setup? I know that SimH had problems booting from TU58
> but as far as I remember that should have been fixed. Try the latest SimH
> on Github.
> Do you have enough working memory in your system? Have you ran diagnostics?
> Maybe it is a good idea to create a bootable TU58 with XXDP. If you use
> SimH you can create your own bootable TU58 without to much effort. I did
> this when working on my 11/04. Use one of the RL02 images on bitsavers and
> try to follow the guide I have a bit down on this page:
> http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-04
>> I tried v4 using a method I found on-line (modifying with SIMH to make it
>> bootable as a TU58 image rather than an RK) but it doesn't work so I wanted
>> to first eliminate the system version as the potential problem.
>> Thanks!
>> Rich
>> Sent from my iPhone
> Good luck!
> /Mattis

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