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Re: Composite CGA fixed?

You want to be declared the winner of this "discussion"? Fine, it's yours. What the hell are you talking about? I just explained to you about port register writes, how the same register write must result in the same colors produced (Burgertime colors = Ms. PacMan colors). Do you understand that? …

Re: Composite CGA fixed?

RGB/Composite monitor Well, which one? RGB or composite? Ms-Pac Man writes the same value (0x0f) to the color select register 0x3d9 that Burger Time writes. It follows that Ms. Pac-Man's colors must be exactly the same as Burger Time's. If you wanted the maze to be pink, the beans in Burger Time …

Re: Composite CGA fixed?

These hues look all right to me. I thought you had like a pink Pac-Man or something. I understand what you are saying. No, you don't understand. The algorithm produces "accurate" colors in that the resulting RGB colors are what you see on a NTSC-compliant TV with the "hue" control at "default" …

Re: Composite CGA fixed?

How does it look like in the "latest CVS"? Screenshot please. Also, keep in mind that a real NTSC monitor/TV has a "hue" control, which is adjustable in the original code as well. I understand it is not in DosBox's implementation (many things are missing from the original code). I suspect the color …

Re: 40 Column Text Mode Issues

For example, if the CGA has a pixel clock of 14.318 in the 640 pixel mode and 7.16 in the 320 pixel mode, the ratios match with the NES's 5.37 pixel clock in its 256 pixel mode. Nono. That Atari page you linked had me fooled for a while, but some if the information on that site is complete BS. For …

Re: 40 Column Text Mode Issues

luminance signal, which is 5.37MHz. How do you figure that? (I'm not sure whether the amplitude varies.) No, the amplitude, which is saturation, is the same throughout all 12 colors. In terms of voltage levels at least --- the 3x colors will appear less saturated due to white clip, and and some TVs …

Re: 40 Column Text Mode Issues

color burst method of generating low-res color output from a hi-res monochrome signal? I don't know what you mean by "color burst method", the "color burst" first tells the TV that it should decode color information, second, it's a reference for the color difference signal that is modulated in …

Re: 40 Column Text Mode Issues

NTSC certainly lives up to its nickname "Never the Same Color Twice" Undeservedly so. The reason for most inaccuracies lies in bad engineering on part of TV set manufacturers, and the reason that most people think the "hue" and "saturation" controls are to be adjusted to a setting you "like", as …

Re: 40 Column Text Mode Issues

I'm not sure I would rely too much on MobyGames' screenshots, I *have* seen the composite color mode on my TV, and I've found that the screenshots are reasonably accurate. I could also say that my colors are right because that's the way my TV looks, but I don't think that I would be making a strong …

Re: 40 Column Text Mode Issues

Implemented wide-angle color demodulation. Instead of decoding the chroma signal 100% as the NTSC specification calls for, the R-Y is more then the proper 90 degrees apart from the B-Y axis (hence "wide-angle"), yielding a picture that might be more pleasing to the eye, but less accurate with …

Re: 40 Column Text Mode Issues

Indeed. My version of the game didn't have that monitor selection, but the abandonia one did. Odd. Anyway, here's screenshot with my original algorithm (optimizeText off). Bruce Lee's "red" text is actually gray. As to your question, optimizeText optimizes text that is black on white and white on …

Re: 40 Column Text Mode Issues

the best way to implement this videomode is to use the vga pallet which is 8 bit. Do what you think is best, but keep in mind that composite modes are based on the NTSC color model, which doesn't know "palettes" or "bits", but is purely analog. I only set the hue and saturnation to values I liked …

Re: 40 Column Text Mode Issues

Looks like I have to register at every forum to get points across. Anyway: Comparing the screenshots of NewRisingSun's algorithm to the MobyGames screenshot linked from that thread, it seems he has red artifacts where the MobyGames shot has blue, and vice-versa. That's not a function of the …

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