clownmdemu-frontend

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Vladikcomper and at least one other ROM-hacker have bumped into the issue of loading >4MIB ROMS - they fail to load properly due to exceeding the size of the cartridge mapping space. Attempts to read beyond this space instead cause data to be read from the Mega CD mapping space.

The most immediate thing to do is present the user with an error message, letting them know that their ROM is too big. Additionally, I should double-check what actually happens on a real console, because I swear that I once heard that large cartridges actually override the Mega CD mapping space, rather than the other way around.