This will work on the Zega Mame Gear, Mame Boy+ and Mame Boy Advance SP Kits
Step 1.
Run the following from your Raspberry Pi with Internet connectivity
sudo nano /etc/modprobe.d/raspi-blacklist.conf
If the file is empty, just skip this step
However, if you see the following lines:
blacklist i2c-bcm2708
blacklist snd-soc-pcm512x
blacklist snd-soc-wm8804
Update the lines by putting a # before each line
Save your changes
Disable headphone audio (if it's set)
Edit the raspi modules list with ...
sudo nano /etc/modules
If the file is empty, just skip this step
However, if you see the following line:
snd_bcm2835
Put a # in front of it
... and save the changes
Create asound.conf file
Edit the raspi modules list with
sudo nano /etc/asound.conf
This file should be blank!
Copy and paste the following text into the file
pcm.speakerbonnet {
type hw card 0
}
pcm.dmixer {
type dmix
ipc_key 1024
ipc_perm 0666
slave {
pcm "speakerbonnet"
period_time 0
period_size 1024
buffer_size 8192
rate 44100
channels 2
}
}
ctl.dmixer {
type hw card 0
}
pcm.softvol {
type softvol
slave.pcm "dmixer"
control.name "PCM"
control.card 0
}
ctl.softvol {
type hw card 0
}
pcm.!default {
type plug
slave.pcm "softvol"
}
Save the file as usual
Add Device Tree Overlay
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sudo nano /boot/config.txt
And scroll down to the bottom. If you see a line that says:
dtparam=audio=on
Disable it by putting a # in front. Then add: ...
dtoverlay=max98357a
Save the file and reboot your Pi with
sudo reboot