HP Forum Archive 21

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Classic calculator display chip type number? Message #1 Posted by Juergen Hofstaedter on 21 Jan 2013, 7:56 a.m. I am searching for spare display chips for the classic calculator series, for example HP-65. If I remember correctly Hewlett Packard made them themselves, but it would be helpful to know the exact type number for starting a search? Thank you!

Re: Classic calculator display chip type number? Message #2 Posted by Harald on 21 Jan 2013, 3:14 p.m., in response to message #1 by Juergen Hofstaedter I probably have a spare one. I can check on the weekend.

Re: Classic calculator display chip type number? Message #3 Posted by Randy on 21 Jan 2013, 4:33 p.m., in response to message #1 by Juergen Hofstaedter The part number is HP 1990-0335. Further information is available here: HP Classic LED Display Information You need not search the Internet for them, you will not find them as spare parts. Just buy an old HP45 and part it out.

Re: Classic calculator display chip type number? Message #4 Posted by Eric Smith on 22 Jan 2013, 12:47 p.m., in response to message #1 by Juergen Hofstaedter Depends on whether you're talking about the anode driver chip, or the cathode driver chip.

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