How to Use Game Controllers
From MorphOS Library
About Game Controller Support
MorphOS offers two different interfaces for game controllers: newer sensors.library and older lowlevel.library for the legacy support. Games supporting the sensors.library are still quite rare, but it is planned that it will become the only API for controllers and lowlevel.library would only be a wrapper for it.
MorphOS supports standard HID compatible controllers, which don't require any extra commands to be used.