Classic Display Notes

[teenix]

Hi all,

I have added some more info to my Classic notes.

I have snapped some logic traces capturing information on the WS IS and IA busses from my HP-45. I have tried to document how it all works and what the wave forms represent.

I still have to do the RAM chip signals but I cannot make sense of the BCD line yet. Plus it is hard to capture when that bus is active when you press STO 1 for example.

http://www.teenix.org/ClassicDisplay.pdf

I will probably have to slow down with HP stuff for a bit. The flight school that I used to instruct at is opening a new school on the western side of Port Phillip Bay and they want me to manage it. As the school is new and has to get off the ground (pun) it is going to eat into my spare time for awhile. There is not much money at this end of the aviation spectrum so it will mostly be a labour of love - until I fire up my simmering urge to retire :-)

cheers

Tony