Hey, I have lots of CS/80 drives which I stil use at work with HP1000 E/f series computers. I had a "CS/80 Programmers Manual" from HP which described each command in detail. I am currently looking for my copy since I wnt to do a little experimentation with using a PC with GBIP card to emulate a CS/80 drive. If I find my manual I will let you know. In the mean time, if anyone else digs up one of these babies, please tell me John