MC Bidirectional Bus IO test - all combinations at 24mA/5V at 33MHZ using MC Dev Bd 01 

This Microcharlie test uses the Dev Board 01 to test all 40 IO's for correct operation at a speed of 33MHz. The test starts at 25Hz, where you can see the test counter counting. Then moves to 25KHz, then 25MHz before going to 33MHz.The test consists of a counter and comparator, which sets a value on pins 1-20 pins of the DIP connector and compares it using pins 21-40. This goes through all values, and then changes direction, setting the value on 21-40, and comparing on 1-20. If an error, ever occurs (demonstrated in the last few seconds of the video) where the value is wrong, the tests stops and displays the faulty value.
More info/history here:
drive.google.c...