I'm pretty sure what Toni is saying is that there is NO NVRAM generated in MAME, rather MAME cracks the game so it doesn't need to access NVRAM.
If someone happens to have an original Cubo machine I might be able to give a hand with getting the NVRAM data out... at the very least data stored in NVRAM is small enough to be converted to BASE64 and printed on a screen, so I've got a utility sitting around somewhere for just that purpose
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