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Famicom/NES / Re: miscellaNEouS files
« on: March 09, 2024, 07:42:03 AM »No, and creating one would be difficult, as the game uses 8x16 sprites, which make the MMC3's scanline counter act near-inscrutably: "When using 8x16 sprites, PPU A12 must be explicitly tracked. The exact time and number of times the counter is clocked will depend on the specific set of sprites present on every scanline. Specific combinations of sprites could cause the counter to decrement up to four times, or the IRQ to be delayed or early by some multiple of 8 pixels."But after all, some of the Cony Soft games were successfully hacked to MMC3, so it's still possible.
Here's what I learned about the late ports from Cony Soft/Future Media:
"In Crayon Shin-Chan, MMC3 is possible due to the use of CHR banks in PPU $000-7FF and $800-FFF as whole, and in CPU $C000-DFFF banks with garbage and the code is similar at the beginning, so you can only transfer data and change the code. In San Guo Zhi 4 - Chi Bi Feng Yun, at the beginning of the game, CHR banks are also whole, but there are several banks in the CPU $C000-DFFF and they are more complicated, so it's more difficult."