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The Indigo operating system is an OS that runs on a Mega Drive and (tries) to turn your console into a computer (・ω・) Programs are indeed separate from the kernel (there's a minimal filesystem on the ROM) and communicate through syscalls, while the kernel takes care of most of the GUI tasks.
jojo wrote:EDIT: A note, I don't know what your test system is (rom cart?), but it doesn't seem to work with the mouse emulation in Fusion.
Pretty sure it does (since I've used it there), just make sure it's in the player 2 port.
Indigo 0.20 supports the mouse in either port so that's less of an issue (I need to finish it but I'm bogged down with other stuff right now), though first I need to find out why it suddenly refuses to run on real hardware anymore. It even manages to make a Sega devkit immediately cut out connection to the debugger (not even wait for timeout), apparently there's nothing else that made it hang that hard.