EricBall's Tech Projects

"Prop" = Propeller?

 

Sounds interesting to me, particularly the NTSC text display driver thingy...and the PWM waveform generator.

"Prop" = Propeller?

Yep, Prop = Parallax Propeller.

 

The PWM waveform driver is something I tried before but didn't get the results I expected. The basic concept:

 

Set Counter A to produce the desired output frequency and Counter B to output a DUTY (i.e. PWM) waveform to the desired output pin.

Read Counter A's phase register and use the MSbyte as a lookup into a PCM waveform table.

Set the frequency for Counter B to the lookup value.

Repeat for the desired time period.

 

In theory, instead of a square wave you can produce more "musical" tones.

I also have Leprechaun & SpaceWar! 7800 to finish. Getting back to these means relearning my own coding, a daunting task.

 

Yay Leprechaun Incidentally, the soon-to-be-released Harmony cart will enable you to release Leprechaun on an actual cart.

 

Chris

 

P.S. Would be nice to see a video of that Prop demo?

You mean Eric's driver demo?

 

I was thinking the same thing. Do some captures and maybe a short movie.

 

Eric, are you ok with that?

 

Gonna have to do some stuff with the code. It's the best color output on the chip, BY FAR.