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mobiusstriptech
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Posts posted by mobiusstriptech
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In case anyone was concerned about stock, I still have a pretty healthy amount left from the first batch and have a second batch in production already. I expect to still have boards from batch 1 by the time batch 2 arrives.
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On 8/9/2020 at 9:52 AM, Retro_Game_Lover96 said:I am so eager about those boards.
If you didn't see, my boards have been available for purchase for a few hours. Most are shipping same day or next day. Just depends on when the order goes in and when the Post Office run is. I am doing both US and International sales. Boards are all manufactured at the highest quality and all parts are sourced from legitimate electronics distributors. There are no AliExpress parts anywhere on the board and no cheap prototype JLCPCB, DirtyPCB, or other inexpensive fab houses in use. This matters as many of the places that specialize in prototypes have a thin solder mask that is easily rubbed off. Not the case here. All boards are ENIG finished in a 0.8mm thickness to ease soldering and prevent oxidation/corrosion. I also went with an extremely tight tolerance on R8. Specifically a 0.1% Panasonic Thin Film resistor. These are already tested, bagged, and ready for you.
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There was never a schematic for the PCB. It was made from that schematic. Anyone who wants to take it on is of course welcome to do so. I've been working on a replacement for a long time now but I have lots of projects and not a lot of time. So it is not a quick fix.
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It's near the beginning. Be prepared for a lot of support if you offer these for sale. The original circuit needs many modifications and I spent a considerable amount of time dealing with people who were upset about the quality. Along with the need for an oscilloscope to properly dial it in, which most users won't have.
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The schematic is posted in this thread. It's open source and has been around for 20+ years
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What is displayed on the LCD screen of the OSSC when you connect it?
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The OSSC is compatible with csync. The issue is the circuit used in the French Colecovision.
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In this same thread he's already been told. If he really paid 2k for someone to make one, they not only ripped him off but should have done their homework. The citrus board was adapted from published datasheets. I'm taking it further and will have something superior to any of the available RGB mods, except the F18. Since that mod adapts the digital signals and uses code to build RGB.
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Citrus does not have anything to do with the project anymore. He created the first revision and released it. I took over the project from him and have been actively working on it ever since. But ultimately, it is an open source project for anyone to work on/use.
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Yes absolutely. Just keep in mind that whoever sells the boards is ultimately responsible for providing support.
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Anyone can sell the colecovision RGB boards from citrus. The new boards I have been working on however, I have no intention of selling on eBay.
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Well it turns out I am correct. There is a mistake on the 2019 Lynx PCB that prevents access to VGA mode. You have to sever the trace to remove ground from the menu pad and allow VGA mode to be accessed. While this lynx is still weird in other ways, the VGA and LCD modes work now.
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So looking into this more. I think the newest revision boards have a mistake in them. The board I have here is new this year. I noticed that right away since the ground pad is no longer under the flex cable and it says McWill really big on the silk screen. It appears that the menu pad is ALWAYS connected to ground now. So no matter what you can never get into VGA mode. The only thing I can think of to try and stop this is to cut the trace leading to the via that is connecting it to ground. However I am wary of doing this since I believe this is likely a defect or a new change in the install that has not been disclosed to people. I'd love to get some feedback here from McWill himself.
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Yeah that is a perfect explanation of what I am encountering. I was considering just adding a separate button to control the mode switching for this customer. Since ultimately the VGA mode was what they really care about. The membrane used on the Lynx 2 has been problematic as long as I can remember, so it doesn't surprise me at all. Thanks for giving me hope that I am on the right path.
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Has anyone seen issues with the VGA output not being able to be switched to? The screen works fine. The menu pad is not shorted to ground. Whenever the backlight button is pressed, the power led turns off. I can switch between the scanlines and no scanlines, but never switch to the VGA output. I am considering using a separate button instead of the backlight button, since the primary use case of this install was VGA output. As far as I can tell the membrane for the Lynx 2 seems to be having issues.
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Very much appreciate the update on the Majesco. No worries here. I just wanted to verify.
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I'm not in that area but I am able to do all of that work if you decide you want to ship the systems and can't find anyone local. Good luck!
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McWill are the majesco game gears still not officially supported at this time? The last comment I saw was that a firmware update was needed but that was at least a year or 2 ago.
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Yeah I was looking at the wiring fix and saw it in the corner of my eye. Always better to fix that stuff before it gets too bad.
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While you are in there. You should clean that green cartridge contact as well.
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As a small update. I have the newest revision prototypes in hand. These boards are currently in test and from my testing thus far they perform on par with the previous boards.
Now that being said, I have begun to make modifications to the circuit from what citrus originally put out. All of these modifications are based on my findings from all of the installs. I believe I have located the source of the green bleed issue, as well as the dark/narrow line issues that those consoles were displaying. I am currently investigating a few other minor things I would like to see changed or improved.
So no ETA on a new batch yet but hopefully in the near future.
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New prototype boards should be here soon. I have a few Colecovision consoles to test these on so with any luck I will be ordering the new batch very soon.
On a different note, I have had 2 people report issues with green color bleed on white lines, specifically the lettering. It is most prominent in cases where a digital display and a scaler (Framemeister/OSSC) are in use but it might be visible on some PVM/BVM. In both cases there has also been an issue with screen brightness. If anyone has purchased a board from me and encountered this, please let me know. I am interested in finding a solution to this, if it is possible.
On one board I had to use a much larger value pot for green to drive the signal down to spec. It was seeing 1VPP with the 5k pot maxed out.
Again this has been limited to only 2 reports so far and the same RGB board does not exhibit the issue on a different Colecovision board. So I do believe it is the main board that is causing the heavy green saturation and dark image.
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While I am all for preservation, it is possible to composite mod the console without damaging the casing. My own personal RGB modded console has no holes cut in it.
You also have to watch because some modern TV's won't even pick up the RF signal.
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That's why I said for testing. I didn't say I use it all the time. I have a proper manual switch as well if I want to do something beyond see if the Colecovision will display an image.
Although honestly why even use the RF? The video output was never good and even a simple composite mod is exponentially better.
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SegaCD32x games: MSDEXP (MegaSD Expansion Adapter) - Getting one?
in Sega Genesis
Posted
The connector I have installed in the MSDEXP is good for thousands upon thousands of insertions. Both the cart connector and the expansion connector are gold plated as well. The main advantage to using it for CD games with the 32x still attached is that you don't also need to mess with the AV and power cables when you want to play CD games. With the 32x, you need to remove the AV cables and reconnect everything.