Printing from HP-86B ?

[cruff]

(07-10-2017 06:35 PM)Paul Berger (Canada) Wrote:  That would be my take as well, for device mode you still need a host system to initialize the adapter and set the mode of operation, I suppose it could function like PIL-Box for GPIB.

Because the USB serial interface uses inband commands, you would need some minimal intelligence to manage the device mode operation. This would include character escaping, similar to what you needed to do for AT-command set modems, but a small microcontroller would suffice.