HP 21MX Ethernet/SCSI card?

[Glen Slick]

On Thu, Feb 19, 2015 at 5:59 AM, Johannes Thelen
>
> Machine have boot ROMs for terminal, papertape, 79xx drives, C580 disc (what?).


That is CS/80, not C580. You would need to find an 12821A HP-IB
Interface to use that.
http://www.hpmuseum.net/display_item.php?hw=486

If you did find one of those then you could use the HPDrive software
on a PC with a GPIB interface to emulate a CS/80 drive.
http://www.hp9845.net/9845/projects/hpdrive/