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Keypad read delay


azure

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I have question referring to the delay mentioned in the Stella Programmer's Guide:

Quote

NOTE : a delay of 400 microseconds is necessary between writing to this port and reading the TIA input ports.

 

I'm assuming the 400 ms delay is due to how potentiometers work, so they require time to wait for the voltage to settle.

 

But, if the 3rd column is read by the trigger button INPT4, can the 3rd column buttons ("3", "6", "9", "#") be read without a delay? Could that be a little optimization?

 

Edited by azure
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