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Found 2 results

  1. One of my 7800s does not work with paddle controllers, and the other does not work with the Harmony cart. The one that does not work with the Harmony is an older model with the expansion port on board. I've read about modifying certain 7800s to make them more compatible with certain games like Robot Tank, but I don't know if that would help with the problem I'm having. What might be causing it to not work with the Harmony? It will usually boot up, then start to either roll & crash or just crash. Sometimes it won't boot the Harmony at all, other times I'm able to load a game before it crashes. Would replacing capacitors help, or changing/removing certain components or resistors as with the compatibility mod? Also, has anyone else heard of certain 7800s not working with paddles, and if so, is there a fix for this?
  2. Okay, the time has finally come. I'm going to make a new drop-in replacement PCB for the ColecoVision. Other form factors such as portables could be made in the future (but not right now). This is still a ColecoVision; I've been calling it a CV-1.2. It's a regular CV with some improvements; it's not the next generation CV-2 with more graphics modes, audio channels, bits, etc. Here's the feature list of the CV-1.2: Component (YPbPr) video output - both RCAs and 1/8" jack provided Composite video output - both RCA and 1/8" jack provided - I don't really want to add this, but I'm guessing it's pretty much required, right? VGA (pure analog, not an F18A type solution) video output - I'm not sure if this will work yet, so don't count on it Audio output - both RCAs and 1/8" jack provided - mono of course, but two outputs available for stereo TVs 24K RAM - for Adam conversions such as Super Zaxxon and Dragon's Lair Static RAM for VDP - instead of DRAM Extra controller ports - to use 2 button Atari 7800 (or 2600), Sega SMS, Sega Genesis controllers Extra keypad support - could be added on the top of the CV console (useful if using Atari or Sega controllers) Easily replaceable controller input chips Single +5V input - either via standard CV power supply or smaller/efficient adapter Internally created -5V and +12V output - Atari Expansion Module support Output voltage for Roller controller - via standard CV power jack Power on LED - multicolour Alternate BIOSes - standard 10s delay, 3s delay, 10s/fire delay, etc. Pause button - capacitive so it's hidden (hopefully), also turns on light, and turns off audio output Built-in 31 game multi-"cart" - activated if no game is inserted Expansion module circuitry remains - for SGM and Atari Expansion Module support All new parts used - except for VDP and audio, which use NOS (new old stock) parts Fits in standard CV case - existing holes in back of CV will likely line up with A/V output and power input The features listed are meant to improve the quality of play of the system, for instance by adding proper video outputs, extra controller/keypad inputs, pause switch, and the simple multicart. The reliability of the system is improved by using static RAM for the VDP, allowing a standard 5V power adapter to be used (this should also make the power switch less finicky), making the controller input chips easy to replace, and using brand new parts. If there are features missing that you think should be added, please feel free to discuss. Unfortunately, this isn't going to be cheap. As usual, I'll do my best to make it as affordable as possible. I'd also like to make a bare-bones version that is still reliable, but doesn't provide some of the extras such as multicart, extra controller inputs, etc. As mentioned, a 31 game multi-"cart" is included. I don't want to add games that I don't have permission to include, so if there's anyone who has games or utilities that could be added, whether it be full or demo versions, please contact me. I'm not sure what kind of compensation could be given, but that's all up for discussion, I guess.
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