HP 28650-69102 - HP-IB interface board - HP-IB Interface Board - for the HP-PB I/O Board Slot(28650B) Retail
HP 28615-69004 - Fiberoptic peripheral interface board - Fiberoptic Peripheral Interface Board - for the HP-PB I/O Board Slot (P/O 28615A or 28616A) Retail