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Sun Jan 18 23:53:55 EST 2015

switch readout

Had a look at scope's front panel readout.  Each switch / rotary
encoder half has a diode in series.  Readout seems to be
time-multiplexed.  Bus is a resistive pullup.

How is this supposed to work?  Can't figure it out atm.  Here's[1] an
explanation.

[1] http://www.openmusiclabs.com/learning/digital/input-matrix-scanning/



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