SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Now check pin 20 of the RIOT for +5V Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Now check pin 20 of the RIOT for +5V Yup, 5V on pin 20 of the RIOT. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Check pin 23 of the TIA Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Check pin 23 of the TIA 5V on Pin 23 of the TIA Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Does your model also have a buffer chip 4050? If so check 5V on pin 1 of that chip. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Does your model also have a buffer chip 4050? If so check 5V on pin 1 of that chip. Hmm, I'm not sure. I don't think so. It's a 2600 from 1980. Board revision 14. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Hmm, I'm not sure. I don't think so. It's a 2600 from 1980. Board revision 14. It doesn't have that chip then if it is R14 Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Check to see if you have voltage present on pin 3 of the TIA Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Check to see if you have voltage present on pin 3 of the TIA Looks like there is around 4.5 V on that pin. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Looks like there is around 4.5 V on that pin. Check to see if you have the same on pin 3 of 6507 Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Check to see if you have the same on pin 3 of 6507 Yup, that checks out the same. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 can you swap out the cpu and tia? Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 (edited) can you swap out the cpu and tia? Sadly, I only have the TIA and RIOT chips desoldered from the old Atari Junior. I've been meaning to desolder the 6507 too. I've swapped the RIOT and TIA chips with the same results. Edited June 1, 2017 by New Horizon Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Sadly, I only have the TIA and RIOT chips desoldered from the old Atari Junior. I've been meaning to desolder the 6507 too. Can you try the TIA then? Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Can you try the TIA then? Sure. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Also want to double check you are getting a solid screen right, with just some waviness in it? You aren't actually seeing any part of the game when you put in carts right? That is kinda the way I was taking it when you mentioned same as no cart. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 I swapped the TIA, which is the original TIA from the system. I don't get any sound or video output from that one at all. Just a black screen. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Also want to double check you are getting a solid screen right, with just some waviness in it? You aren't actually seeing any part of the game when you put in carts right? That is kinda the way I was taking it when you mentioned same as no cart. That's right. No parts of the game, just waviness or sometimes solid with weird noises like you would expect with no game inserted. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 Another thing I would look at closely is the pins on the cart connector, make sure none are bent or anything and it looks like they should make good contact and that they are clean. let me know if changing the TIA does anything Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Perhaps tomorrow night I'll remove the 6507 from my old Atari JR and see if that makes a difference. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Another thing I would look at closely is the pins on the cart connector, make sure none are bent or anything and it looks like they should make good contact and that they are clean. let me know if changing the TIA does anything No, changing the TIA just goes back to the original behavior of the system. Before I swapped in the TIA from an old Atari JR, all I got was a black screen with no sound. The TIA from the JR is definitely a step closer. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 Going to have to hit the sheets here. It's 11:30pm. Thanks again for helping to troubleshoot the problem. I'll desolder the 6507 tomorrow night and see what happens. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 I would next swap the CPU when you get a chance to desolder it. Wish you had known goods of all 3 to swap with. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 1, 2017 Author Share Posted June 1, 2017 I would next swap the CPU when you get a chance to desolder it. Wish you had known goods of all 3 to swap with. I'll give that a try tonight. Thanks again. Quote Link to comment Share on other sites More sharing options...
New Horizon Posted June 2, 2017 Author Share Posted June 2, 2017 Well, I'll be. It's working. I de-soldered the 6507 from one of my non-working Atari JR's, popped it into the 4 switcher, and the first game I tried worked!!! Thanks for helping out and pointing me in the right direction. Composite mod looks pretty good, not as crisp as SVIDEO or RGB but the colours are nice and rich. Quote Link to comment Share on other sites More sharing options...
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