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YORKE annunciator - HP-48/49
08-15-2016, 09:29 PM
Post: #3
correct - RE: YORKE annunciator - HP-48/49
Yes, thats correct ! May be that there is anyone with a better schematic or with the knowledge of the according pins of the YORKE ?
I am sure that it is a write-only register, a special one, because a lcd display has to be multiplexed and not only switched on/off ! The annunciators are connected directly to the YORKE and NOT to the two lcd drivers. As i mentioned, it may be possible that there is ONE common line and the "6" annunciators are set/rest via the output register(s) of the YORKE.
May be that anyone here as more information ? Thanks in advance
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RE: YORKE annunciator - HP-48/49 - TomC - 08-15-2016, 08:36 PM
correct - RE: YORKE annunciator - HP-48/49 - Peter HOFMANN - 08-15-2016 09:29 PM

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