A new version of MAME just dropped and a new package is ready for your CoCo-Pi.
I did not see anything new for the CoCo, Dragon or MC-10 drivers in this latest release.
When updating your CoCo-Pi, please make sure to select “Update CoCo-Pi from git repo” and “Run CoCo-Pi fix script” in order for all the changes to be applied. Install the latest MAME package (from the same menu). Select mame-0.247-1 as the default version.