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Author Topic: 5000 Plus Keypad Schematic  (Read 1729 times)
dchapma1
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« on: September 08, 2011, 11:00:45 PM »
All,  I plan on building one of these keypads this weekend.  I have pieced together the diagram from several posts on this site and thought I would create a readable schematic.

This should be very easy to construct. From what I can tell by a photo of this diagram from a Bally book, pins 1 and 6 are tied together - this is probably how the MPU knows a keypad is attached.

* Keypad Schematic.jpg (437.79 KB, 3060x2310 - viewed 366 times.)
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dchapma1
Guest
« Reply #1 on: September 08, 2011, 11:59:15 PM »
the more I look at this the more I think I am missing something. Simply connecting a row and column together with a switch doesn't make sense. There are 10k pull up resistors on all the lines on the MPU board holding the inputs to the VIA chip high. I would think that. in addition to the column and row selection the keypad would have to pull these lines low.

I do not see any additional connections on the MPU schematic though.

Can someone that has a keypad shed some light on this?

Thanks
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