[Coco] DAC sound output and keyboard input

[Nick Marentes]

On 21/06/2014 9:09 AM, Steve wrote:
> On 6/20/2014 3:04 PM, Mark McDougall wrote:
>> I'm loathe to open that can of worms. The Apple joysticks have 2 
>> buttons, for digging left and right. A single button changes the 
>> gameplay significantly, for the worse IMHO.
>
> The CoCo3 has two buttons on the joystick.  So what this talk of a 
> single button changes the game play significantly?  Just use a two 
> button joystick.
>
> As for reading the joystick, you only need to see is the joystick 
> below the 1/3 point and above the 2/3 point.  Anything in the middle 
> range is no movement.  Just make sure you turn off the DAC to the 
> sound output while doing the joystick read and write back the old DAC 
> value when done.
>
> On more item, add an NOP or two to let the DAC and comparer time to 
> give you a true reading.  Reading the hi/low flag of the compare too 
> quickly will give you "bad" readings.
>
> To make sure they use a two button joystick, just use the second 
> button to start the game.  No second button than no joystick for control.
>
> That's how us old timers did it back in the day.
>
> Steve
>
>


What he said.   :)

Nick