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Mame experts : why are some Sega boards so difficult to emulate?



I got a question for Mame experts.

I noticed that roms for some Sega boards (Model 2, Model 3, Naomi etc.) don't seem to work under Mame, even the latest version.

Quite surprising to say the least, as 

- these systems work with other dedicated emulators (Model 2 Emulator, Supermodel...)

- Naomi and Dreamcast are very similar, and Dreamcast emulation is quite good nowadays

- same generation systems by Capcom, Namco... seem fairly well supported under Mame


Mame developers are very good and do a fantastic job so I was wondering, on a purely technical level, what makes some Sega boards so difficult to emulate?

Any idea?



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Could just be a lack of proper implementation of certain arcade boards. Model 2, Model 3 and NAOMI more than likely aren't nearly as well-studied in the context of MAME to the extent that something like the CPS2 or the Namco System 22. 

Local dickhead and VHS collector. Collector of random copies of Fantavision and Gran Turismo 3: A-spec.

Volume / Normalized 100% / 98% (content loudness 0.1dB)



@handymanshandle x @pinksnowbirdie | Jake x Brendan :^

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