[Coco] Detecting when CoCo is turned OFF

[Salvador Garcia]

Thanks Allen!
Yes, I just want the CoCo to tell the Arduino when it is shutting down, and yes, I am going to use an RS232 to TTL converter, like the ones that I reference in these links:
https://www.amazon.com/NulSom-Inc-Ultra-Compact-Converter/dp/B00OPU2QJ4/ref=sr_1_3
https://www.amazon.com/HiLetgo-Level-Converter-Board-Rs232/dp/B00LUDCAXQ/ref=sr_1_18

Can you elaborate  on how I can do this using the converter? Or refer me to reading material? Much appreciated! Salvador

Allen Huffman alsplace at pobox.com
Fri May 7 15:11:03 EDT 2021If you just mean having a way the CoCo can tell the Arduino it is shutting down, that is super easy with the serial port and a .99 cent TTL to RS232 adapter for Arduino.

If you mean a way to sense if it’s powered off, I do not know if those pins have any 5V when not in use. CD is an input, as is RX. I would expect TX to be low when not in use.

The Joystick has 5V at all times, doesn’t it? That would be a possibility, or noticing that there is RF be generated from the video output, perhaps?