A couple of weeks ago Gene was asking about big programs for a ROM. Coincidentally I got a cassette with the 41 System DEMO and thought about putting it in a ROM image - pretty big as it's about 17k bytes (well, words).
It really is an archaeological finding, as it requires a real system (i.e. won't work on emulators like V41; nor without an HP-IL plus printer at the very least).
The tape I got had a few tricky points so I had to restore (what I think was) the original code manually - time consuming, albeit not complicated. Also didn't try the VIDEO, PLOTTER, or PRNT80 demos since I don't have access to any of those peripherals required.
So FWIW, the Module is ready to go. Should be posted in a few days, email me if you can't wait.
Cheers,
'AM