Are all Model 3 "ROMs" EEPROMs? Or are they masked?

Altan

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Are all Model 3 "ROMs" EEPROMs? Or are they masked?

Got another question about Model 3 roms. Did Sega always ship EEPROMs (once that can be reprogrammed) or did they ship mask roms (ones that cannot be reprogrammed)?

I'm wondering whether a purchased ROM board will have chips that can be reprogrammed or not.

Thanks!

... Altan
www.aaarpinball.com
(my Daytona 2 at http://www.aaarpinball.com/Daytona2/daytona2.htm)
 
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