I still have an almost working HP9830 in my garage FWIW. (Complete with HPIB & other plugins & thermal printer). RP Long long ago (1978)(27 years ! :-) ), in a universe 80 miles away, I built a GPIB interface to a HP9830 (I think it was) "minicomputer" / BASIC calculator (take your pick) using a (gasp) Motorola D2 kit using a ?4MHz 6802 and a 6821 PIA (2 x 8 bit ports) for interface. GPIB implementation was partial but could have been as full as required.