[coco] advice needed

[Robert Gault]

I can't remember any software using the monitor sensing line, but that 
doesn't mean much. The only problem might be that the PIA is configured 
for input on that line. You would need to change it to output. That 
means you will need to reconfigure any time the RESET button is pressed 
for the PIAs will be reset based on the ROM.

Lets say that you burn a new ROM which makes $FF22 bit 3 an output. Now 
any software that wrote to $FF22 will probably have to be changed. None 
of the software using $FF22 expects bit 3 to be output so it may not 
keep bit 3 high. There is a fair chance that any software adjusting the 
video PMODE settings, or single bit sound could turn off your monitor.

RJRTTY at aol.com wrote:
> People
>  
>         I have the Attiny12 micro  controller on the converter capable of
> powering down the monitor now.    But I have a  question.    The controller
> blanks the screen whenever the PIA line on pin 10 of the video
> connector is held down longer than about 5 seconds.  Doing it this  way
> simplifies the procedure but I am wondering if anybody knows about
> any software where this might be a problem.    I could give  the controller
> it's own I2C address and an op code for power down
> but that would delay the availability of the controller.
> Does anybody know if this would cause any problems. 
>        The address of this signal is bit 3  of &hFF22.   Any
> potential problems there?
>  
> Everybody give me some feedback even if just to say you
> see no problems with it.
>  
> thanks
> Roy
>  
>