[Coco] Detecting when CoCo is turned OFF

Joel Rees joel.rees at gmail.com
Sat May 8 11:31:02 EDT 2021

I can't tell if you are clear as to whether you're trying to sense state or
change of state, or both.

Also can't tell if you want the CoCo doing something to tell the Arduino
it's up (active) or want the Arduino to be able to read the CoCo without
the CoCo sending it any data.

In particular, if you want the CoCo running some sort of watchdog timer,
you're going to either have to accept that the CoCo won't do this unless
you've loaded the watchdog code. Or you might need to modify your ROM.

2021年5月8日(土) 3:59 Salvador Garcia via Coco <coco at maltedmedia.com>:

> Hello all!
> I am pondering on designing an Arduino based board to receive serial data
> coming from the CoCo's bit banger port. I would like for the Arduino board
> to do something when the CoCo is powered off and am thinking of ways to
> detect this event.
> The serial connection has four lines: CD, Gnd, Tx and Rx. I don;t see
> using any of these for this purpose, unless I missed something.
> Another possible solution is for the Arduino to have a connector that goes
> to the joystick port and monitor its Vcc line, but I really hate taking up
> a port for this, plus this solution seems clunky.
> Does anyone have any ideas? Maybe I am not thinking of something obvious.
> Thanks! Salvador
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