This is a KPI / Supra Interface.
This is one of the first PBI devices to drive MFM/RLL or SCSI imbedded drives it also supported a printer. This KPI is showing off a daughter board that hold all the SCSI and printer parameters. The original requires you to burn a rom for your configuration and it was not possible to change the configuration on the fly. This PBI device would make a great Master configuration for the multiplexer. At some point in time I will make this or a similar device on my Master Computer and move my pbi devices that have r handler to function as slaves.