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

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!).
d.