Quote:
Originally Posted by ischmitz
Check clock input for MCU on pin 19 and ALE output to make sure the MCU is at least not completely fried. Next check that it reads and processes code from the EPROM.
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Also thanks for your reply, Ingo.
See my previous post re pin 19.
ALE/pin 30 see below, as well as some other signals.
Those without a signal I took no picture of.
Do these show expected behaviour?
I will check them against working DME but I'm unsure if I'm able to draw the right conclusion from differences.
Signal on Pin 30 on working DME below:
Pins 31 to 39 all showed data and required 10V/div to be in range of scope.
I seem to recognize the different rows of the maps stored in the EPROM.
Example of pin 38:
