cathode for HP91
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07-30-2015, 04:11 PM
Post: #2
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RE: cathode for HP91
(07-30-2015 06:29 AM)isanchez Wrote: - 1820-1629, integrated circuit , cathode driver Unfortunately there is not an equivalent chip. The cathode driver is also the keyboard scanner and the low battery detection chip, it's relatively complicated and would be difficult to replace with anything other than a programmed microcontroller. (The project that I described here implicitly describes how the scanning works using the RCD and STR control lines.) -katie |
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Messages In This Thread |
cathode for HP91 - isanchez - 07-30-2015, 06:29 AM
RE: cathode for HP91 - Katie Wasserman - 07-30-2015 04:11 PM
RE: cathode for HP91 - isanchez - 07-31-2015, 04:59 AM
RE: cathode for HP91 - Katie Wasserman - 07-31-2015, 05:09 AM
RE: cathode for HP91 - PANAMATIK - 07-31-2015, 08:04 AM
RE: cathode for HP91 - Thomas Radtke - 07-31-2015, 08:34 AM
RE: cathode for HP91 - Katie Wasserman - 07-31-2015, 04:04 PM
RE: cathode for HP91 - Thomas Radtke - 07-31-2015, 05:34 PM
RE: cathode for HP91 - isanchez - 07-31-2015, 08:27 AM
RE: cathode for HP91 - Etienne Victoria - 08-02-2015, 08:35 AM
RE: cathode for HP91 - isanchez - 08-04-2015, 07:21 AM
RE: cathode for HP91 - d b - 08-04-2015, 02:25 PM
RE: cathode for HP91 - TASP - 08-05-2015, 05:22 AM
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