HP 1820-1584 IC replacement?

Bob, Those hp parts, the expansion bus uses them also. If you don't use a rom module you can use on of them, they're located near the rom connector. Rik -----Oorspronkelijk bericht----- Van: "Bob Rosenbloom" <bobalan at sbcglobal.net> Verzonden: ?11-?5-?2013 07:40 Aan: "On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Onderwerp: HP 1820-1584 IC replacement? I have an HP 9872 plotter that just died. According to the internal self test (very nice!) one of the bib (MOS to TTL) drivers has failed. A scope shows one data line not moving also. The HP part number is 1820-1584. I can't find a cross reference on the web for it. Does anyone know if there's an equivalent chip? It's a 20 pin dip. +7 volts on pin 20, gnd on 10 MOS side is pins 1-8, TTL side is 12-19 A signal called TTL on pin 9 and another control signal, BD on pin 11 I would love to get this running again. Thanks, Bob