[cc'ed: Daniel Jameson who I believe is the author/recompiler of this new Adventure]

Hi Nathanael, I hope you're doing well. :)

I've just run across this port of MCDO0551 online. I believe it is a simple recompilation of MCDO0551, by Daniel Jameson, February 2016, with no additions; it could be taxonomized as JAME0551.
http://stardot.org.uk/forums/viewtopic.php?t=10785
(See attached zip.)
From the thread, I gather that it runs on Panos, on the BBC Micro and/or Acorn.

From the porter's thread post:

So, what good is a "Mainframe on the desktop" without ADVENT installed on it?

In the attached zip are two double sided disk images. One (ADPRG.DSD) contains the program (ADVENT-rif) on side 0 and data file (ADVTXT) on side 1, the other contains the sources on side 0 and the unprocessed data file (ADVDAT) on side 1.

ADVENT-rif and ADVTXT need to be in the same directory for it to run! That means it can't be run from floppy unfortunately (or perhaps it can, but it might need some Panos-fu which I'm not party to)

This was the earliest version I thought I had a chance of getting to play ball, it was still not straight forward - the IOR, IAND and IEOR functions are missing from Acorn's implementation of F77 (they're non-standard, but most had them), so I ended up writing them in Pascal then finally working out how to call a Pascal module from Fortran - which is doable although it's not immediately obvious from the documentation how it actually works. That's probably more down to me not speaking either language :D

The good news is it should run without an FPU - I've checked through the source and everything seems to be an integer, I couldn't find any REALs.

Please let me know how you get on. It was compiled on Panos 1.4 so mileage on 1.1 may vary (you should, however, be able to recompile it if it doesn't work!).