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Mark1960 · 29th Mar 2021, 4:59 pm

I don’t think you would scan the inputs the way you would with a typical keyboard matrix.

Maybe interrupt on any active key input, then read the 13 inputs and detect which 2 of 13 to decode the key pressed.

You could also possibly use two priority encoders, one for row and one for column, then combine the output to address an eprom to decode the character pressed.

29th Mar 2021, 4:59 pm	#126
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,298	Re: The Transam Triton Personal Computer I don’t think you would scan the inputs the way you would with a typical keyboard matrix. Maybe interrupt on any active key input, then read the 13 inputs and detect which 2 of 13 to decode the key pressed. You could also possibly use two priority encoders, one for row and one for column, then combine the output to address an eprom to decode the character pressed.