I have the Honey Bee adapter for SNES which can make PAL games run fine on NTSC systems. I have trouble getting my PAL copy of Parodius to boot on the NTSC system which did have the tabs chipped, so even though it fit, it was locked out, but the advantage of still using the adapter is that PAL games manage to work, at least for me, but I never tried any others besides Parodius. Seemed to run at the right speed, too. I have that adapter for sale too, by the way, so PM Me if you want it.
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Govinda jaya jaya, Gopala jaya jaya. Blessed Krishna, save us!