MrPix Posted June 26, 2020 Share Posted June 26, 2020 4 hours ago, emmanuelf said: https://spie.org/samples/TT54.pdf If you're using this as a way to disagree with me, I will quote from the first paragraph: "This glassware equals or exceeds the finest crystal in lead content and comes very close to being defect free in both contaminant-induced artifacts and optical properties." You're citing general info about CRTs used for televisions, which have a different materials construction from monitor tubes (and is shown in the materials used in monochrome CRTs. Quote Link to comment Share on other sites More sharing options...
emmanuelf Posted July 5, 2020 Share Posted July 5, 2020 Most color CRT front panel are lead free as you could see in this document and the radiation problem is on the back of the tube which is leaded and coated. But it is nitpick anyway .... Quote Link to comment Share on other sites More sharing options...
Ikrananka Posted July 6, 2020 Share Posted July 6, 2020 No idea if this is remotely relevant but I stumbled across this today. https://hackaday.io/project/13056-tms9929a-rgb-and-component-adapter Quote Link to comment Share on other sites More sharing options...
Falonn Posted July 6, 2020 Share Posted July 6, 2020 That's the "Hackaday" circuit in this comparison back on page 14. The sample-and-hold idea used in TMS-RGB comes from that one. It had a great, original idea on how to solve the too-much-blue problem. Quote Link to comment Share on other sites More sharing options...
Ikrananka Posted July 6, 2020 Share Posted July 6, 2020 1 hour ago, Falonn said: That's the "Hackaday" circuit in this comparison back on page 14. The sample-and-hold idea used in TMS-RGB comes from that one. It had a great, original idea on how to solve the too-much-blue problem. Sorry, I suspected you were very aware of this already. Quote Link to comment Share on other sites More sharing options...
Falonn Posted July 6, 2020 Share Posted July 6, 2020 No need to be sorry. The more I've investigated, the more I've found these things hiding in the cracks. I only spotted this attempt from New Zealand a few weeks ago (where they had RGB output for the SC-3000 in mind instead of the Colecovision). It looks like they went through a lot of the same steps as we did here, only three years ago. I wouldn't be surprised if there were another half-dozen people that have worked on the same thing over the years. Quote Link to comment Share on other sites More sharing options...
Ikrananka Posted July 7, 2020 Share Posted July 7, 2020 21 hours ago, Falonn said: No need to be sorry. The more I've investigated, the more I've found these things hiding in the cracks. I only spotted this attempt from New Zealand a few weeks ago (where they had RGB output for the SC-3000 in mind instead of the Colecovision). It looks like they went through a lot of the same steps as we did here, only three years ago. I wouldn't be surprised if there were another half-dozen people that have worked on the same thing over the years. Yeah, I've seen quite a few others over the years myself. Many years ago I tried to build a ColecVision to component video mod based loosely on the "TMS9928/29 and TMS9128/29 Interface to Color Monitors" report. While I got an image, I got the dreaded blue tint all over the screen. As I didn't have a clue about what I was doing with analogue video signals, other than being handy with a soldering iron, I gave up. At least I enjoyed the process ? Quote Link to comment Share on other sites More sharing options...
Falonn Posted July 10, 2020 Share Posted July 10, 2020 Alright, the official launch thread for TMS-RGB is up, over here. Quote Link to comment Share on other sites More sharing options...
Falonn Posted August 2, 2020 Share Posted August 2, 2020 As a footnote: I went back and annotated the "TMS9928/29 and TMS9128/29 Interface to Color Monitors" document, otherwise known as the "TMS Doc" earlier in this thread. This version highlights all (9!) known mistakes, including a new pair I only just discovered in the description of the blue channel conversion. If we discover more, I'll keep it updated in the same place. 1 Quote Link to comment Share on other sites More sharing options...
Jboner1058 Posted August 11, 2020 Share Posted August 11, 2020 Is there a difference between TMS9928anl and TMS9928an chips? Looking for a replacement chip and the original is an anl but the ones I’m finding cheap off eBay are only designated AN Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted August 11, 2020 Share Posted August 11, 2020 This is just a guess, since TI's suffix designations are a bit of voodoo that can mean anything from performance differences to how they are sold in bulk (tube, box, etc), but I know that the chips can come in either ceramic or plastic packaging. Maybe the "L" means "pLastic". Or maybe it means "Lead free", though that may not have been a concern during the chip's manufacturing lifetime. Anyway, if the chips are cheap enough, it shouldn't be a huge concern to try one. They all have the same pinout and respond to the same programming. Quote Link to comment Share on other sites More sharing options...
mathewbeall Posted August 29, 2020 Share Posted August 29, 2020 Just got some time to install my Coleco board I got from Mobius Strip (https://mobiusstriptechnologies.com/product/colecovision-rgb-board/) Easy install - got everything put all back together - works PERFECTLY! So much cleaner - i love it! Thanks all for this amazing community collaboration. Matt 1 Quote Link to comment Share on other sites More sharing options...
Ianr757 Posted October 7, 2020 Share Posted October 7, 2020 The beginning of this thread though haha, oh Yurkie. 1 Quote Link to comment Share on other sites More sharing options...
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