YORKE annunciator - HP-48/49

[Peter HOFMANN]

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
Peter