11 March 2016 - Forum Rules
Started by Gravedigger, May 30, 2019, 05:03:54 AM
Quote from: Disch on May 30, 2019, 05:33:05 PMI was under the assumption he's either using an emulator or he's got a PAL PowerPak/EverDrive-N8 that he's going to use. Didn't think we was going to actually gut out a real VRC6 cart. I think he just wants to run the game on the 50Hz he's used to.
Quote from: Gravedigger on May 31, 2019, 03:14:27 AMThank you for your answers. i have an everdrive n8 with a nes pal edit. The music of castlevania 3 jap are just perfect. the problem is that the game is slow (50hz). If it is impossible to replace the music of the Pal version with those of the jap version I have another question: can we hack the rom to speed up the game, so that the rom runs at normal speed on my 50hz nes? thank you
QuoteSetting aside the music part of this problem... VRC6 doesn't play nice with PAL.VRC6 uses a CPU cycle IRQ counter that simulates scanlines by counting 113.6667 cycles and treating that as a single scanline. The problem is, on PAL, scanlines are ~106.5 cycles long. So EVERYWHERE the game uses IRQs (which, in some places, is 3-4 times a frame), the IRQ counter would need to be readjusted, and it's somewhat possible you might not be able to get the timing exactly right, leaving you with some screen jitter.
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