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I bet if I rewrote EHZ, the line would go away, but then i might bring other bugs into the level.

when you start the level all looks fine, but that line gets 'stuck'. it seems to be a bug in the level itself. That bug is the most annoying! when i ported the Emerald Hill Zone code, it went with it. In fact, I'm amazed it's still there, at the exact same place. How come you got the exact same 'bug' from the original game, the bottom scanlines in Emeral Hill that do not scroll properly with the rest of the level? Since you're doing a conversion, I imagine that should be an easy bug to get rid of. Some things still make me think though, so if you don't mind I'll keep asking! =) I must admit that since this is not exactly a NES project (probably nobody but you will ever run this game) I lost much of my interest. AFAIK, that can't be done with a regular mapper, that is fully inside the cart, and can't make use of lines that are not in the cart slot.Ībout the sprites, if I understood correctly, your hardware pre-calculates a few tiles to take care of the sprites the NES can't handle, is that it? And because of that some colors are sacrificed some times? So how does that work exactly? Your hardware generates all the tiles the NES will use, but how does the NES tell it what sprites go where and all that? Does your hardware also directly access OAM memory, name table memory.? Will it be possible for you to make custom carts that include the necessary hardware to play this game, so that other people can also play it when it's done? Maybe that will not be possible, bacause you access the palette RAM directly an all that. so you have a very special hardware there. I'm not home, so acceessing my home computer is kinda slow on a 400k connectionĪh. I couldn't find the final version of the games source, so this is Sonic 2 BETA.

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the color limitation is also 'dithering', and taking advantage of how NTSC would blend those colors to make a new color.ĪLSO: Incase you guys want it, here's the source code to the Genesis Sonic 2. I made a routine that emulates a framebuffer on the NES, which essentially lets me get away with, without actually using something called a 'sprite'. The NEC V30 is just taking a tile, assigning colors, and pretty much saying 'NES, here's your tiles, and the colors you are to use for them.' matter of fact, I didn't even know there was a video in connector on the expansion port, i'll need to re-check the pinout. All it has is an ESS VideoDrive, and that's for MPEG-2. The drive doesn't have an actually graphics chip. Well, technically, the NES PPU is being used. So yea, it's a hacked NES, but it's even cooler now. I used Photoshop's color Indexing to break down the colors for me, and from there I coded them into the disc, to be read as a normal NES tile (for the most part). this is the V30 CPU pre-rendering sonic for the specific level) (sonic also sometimes gets a reflecting dot on his head, and sometimes he don't, depends on the level. You may notice that Sonic's blue color changes hue a little between different levels. This allows my little routine I call 'Dynamic Color Palette' to work. The NEC V30 in the 'DVD drive', will pre-render them to their propper format when a level is loading. Some of them, like Sonic and Tails, retain their original sprites.

So that may (and probably will) cause problems if your projects runs on a real Nintendo console (or an emulator parametred to behave with sprite-limitation enabled).the sprite limitation is answered from the other post (in which was being typed when you were typing yours, lol )Īs for the tiles, I had to take all the tiles from the Genesis version, and modify each and everyone manually to fit in. Be cautionnous, because your sprites may not disappear on a emulator, but will on a real Nintendo, because you can only have 8 of them per line. I suppose you used multi-layered sprites to get so many colors at once (only 3 are available per sprite normally), so that'd be a lot of sprites on the screen. This should have been some tedious work, but the result looks pretty good, tough.Īlso, the background looks NESish, but the sprites really looks authentic, I ask me how you made them. How did you convert the graphics from the Genensis to the NES ? The NES have much less colours, so I guess you had to manually convert all tiles of the game in a tile editor to look authentic on the NES.

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