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Found 4 results

  1. After my Vader 2600 has been running for around 10 minutes or so, the colors on the screen start to flicker and fade. The video signal is clear without static or lines. It's just the colors that start to get distorted. Like shown in the video below, the blue background on Ms. Pac MAn turns green. Sometimes it goes completely black and white for a while. I checked the output on the voltage regulator on the board, and it is putting out a steady 5 v. I also turned the color potentiometer. Any ideas? Thanks. https://youtu.be/fIStcwKMiWI
  2. Hi There, I recently picked up “Frenzy” for the 7800. The game is great and I am especially pleased with the inclusion of “Berzerk” which is one of my favorite 5200 games. While I was playing the Berzerk contained within Frenzy, I noticed I would randomly die without any perceivable reason, but this would only happen in the 1500-3000 –ish point range. On my setup, an unmodded 7800 RF connected to a CRT TV, the dark green shade of the robots in that point range were extremely close to black, and what I soon figured out was happening is that I was being shot vertically or diagonally and I am unable to see the shot fly. I also noticed that the “press fire to start” text was this same barely visible shade of green. A revisit to the 5200 edition (also connected via RF) found robots in this point range a much more visible shade of blueish white. Interestingly, when I downloaded the rom for Frenzy, emulated it via ProSystem in RetroArch and got to the same point range, I found the robots to be almost the exact same (and very visible) shade as the 5200 edition. Changes in Tint, Color, Picture or Brightness on my TV did little to alleviate the problem. I am stumped. What might be causing this and what might I be able to do to fix it? Is it possible there is something wrong with my cart? 7800? What I have done is included a couple of pictures. The first one is the title screen, and here it is pretty easy to see that the green “press fire to start” text is very dark, this was easy to capture. Next I have circled a vertical shot in that point range to emphasize how hard it is to see (even though in this picture the robots seem to show up fine) and then for comparison purposes, I included a similar picture of a red vertical shot, which is very clear. Also for comparison reasons, I included what the colors in same point range look like on the 5200 version of Berzerk. Finally, in case the color profile of my 7800 is actually way off and I don’t not know (I don’t have a good point of comparison) I enclosed a picture of “Bentley Bear's Crystal Quest” which is feel gives a pretty good idea of the way things 7800 look on my setup. Please advise and thanks in advance, --DiscoDr.Bones
  3. I was wondering if anyone might know some specific details about the PAL GTIA. The data sheets that are out in the wild seem only to cover NTSC. Here are my questions: From the schematics of various Ataris, it appears that the PAL pin acts as an input (?) for the PAL color carrier frequency line. Is this right? From my understanding, PAL switches color polarity every line and indicates this via changing the polarity of the color burst. Does the PAL GTIA do this? Does this manifest as every other line having inverted hue (i.e. 15-hue), or shifted hue (i.e. 7+hue%15), or what? Is the PAL color palette really substantially different from NTSC? On NTSC systems, the color clock (one gr.7 or 15 pixel) is 279.4 nS long. For color pixels (hue != 0), the COLOR line goes low at one of fifteen possible times, and the delta between each possible color can be (depending on the CADJ voltage level) anywhere between 16 to 35 nS (that's according to the various data sheets; though only values on or slightly below 18.6 nS would make for "correct" color output, as anything beyond that would result in higher color values bumping into the next pixel). On PAL systems, how does this timing work? Is it relative to the color carrier (PAL line?), or OSC like NTSC? If it's relative to the color carrier, does that mean the possible delay values are much shorter than 16-35 nS? Does anyone have any real-world timing measurements for PAL GTIA, or know of a PAL GTIA data sheet? Thanks in advance...
  4. So, this thread is all about the original Gameboy, Gameboy Colour and Gameboy Advance! I love Nintendo's line of Gameboy handhelds and they are certainly my favourite systems of all time! They are what I have the biggest collection of too out of all of my consoles as the vast majority of the games are extremely affordable nowadays. I just think that there are so many classic first party titles from Nintendo on the Gameboy as well as a ton of hidden gems! So, if you fancy a discussion about the Gameboy line of systems and the games on them, feel free to have these discussions here! Also, if you have any questions, feel free to ask them! Anyone who is friendly and respectful is welcome here regardless of whether you're new to the Gameboy or very familiar with it. So, I hope you enjoy! So, let's get this started with a question! What are some of your favourite Gameboy games? Two of mine have to be the Super Mario Land games! In my opinion, they are simply classics! Here is a review that I did of the first Super Mario Land if you are interested:
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