To keep folks up to date. I am through the first round of prototypes for the gamepad & audio Pmod.
The whole process was documented during twitch streams. You can find the archives here:
And finally the working system with @lawrie NES core: https://www.twitch.tv/videos/619520374
The design files of the current prototype version are on the icebreaker-pmod github page.
Regarding future changes. You might have seen during the streams, I was concerned that we might need to add an amplifier to the audio circuit. So far the circuit we have seems to work fine with 33Ohm headphones, speaker amplifiers and audio capture devices. So I don’t think we need to do that.
There are still two things I would like to work on:
- Add the data line pulldown footprints. (I have soldered them between the connector pins on the prototypes) They will provide a defined 0 state if a gamepad is not plugged in.
- Find ways to shrink the board size and make automatic assembly easier.
- Create a gamepad Pod for the NES controller connectors.
If you are interested in a set of boards from the next prototype run let me know in this thread. Make sure to list which boards you want and how many, so I can order the correct amount of parts and boards in the next round:
- Gamepad & Audio Pmod
- Molex SL Connector Pod
- NES Connector Pod
- SNES Connector Pod
As always thanks to all of you for your input and help!