I have an identical item. I need a 720kb floppy LIF formatted floppy disk, mine is shot. If you would care to make a copy of the HP 1651A OS on your machine I would be glad to pay for it. For now I'm dead in the water. I have tried to create a OS disk but I have LOTS of gaps in my machine language understanding. Also any help in this direction would be GREATLY appreciated. Best Regards, Chris Wolters