Paul,
You are a Gold Mine, mate, I just saw a pic of my Osborne.
Can't really do a lot with it, these days, although it's good for writing PLC Ladders, I just download it straight into my PC at home via a RS232 link that I fitted to it some years ago.
It's just like a lap-top, but it's not, I can write programs into it and take them out later, if it wasn't for that feature, it would have found the scrap-heap a lot sooner than it has!. [Linked Image]