Unfortunately on some drivers it is much harder to permanently change the refresh rate values, for example I have for some time tried to modify midtunit.c to change the refresh rate from 54.707 to 60HZ without success, but I agree that the CPU overclocking values are much easier to set. Due to the MAME policies I always feel like a criminal when I customize my own build for personal use and add/remove some “forbidden” functionalities =). Cheers
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“Anyone who has never made a mistake has never tried anything new.” --Albert Einstein