Well, first off, congrats if that old 8088 even powers up and runs!
Secondly..PFWrite? Wow, that brings back some memories

, but I googled it a bunch and coulndn't find a decent link. LOL
Yeah, this is tough. I would, as a first step, get them transferred to .txt (if you even can!) to the floppy drive. If not, at least save them in PFWrite native format. You almost might have to build a pc from scratch that you can toss in a 5" floppy drive. At that point, you could go from the floppy to a USB drive.
Alternatively (harder probably) is if you had a printer for that old 8088...print the docs off and scan them into PDF files!
Good luck...keep me posted as I'm of the age that my first computer was an IBM PC jr (I couldn't afford the IBM PC 8088 back in '79...it was over $3,000!!!). I'm a programmer now and may (and that's a big MAY, be able to convert native PFWrite data file to .txt). I would just have to find out how PFWrite stored it's native files

Fun Stuff!!
