masschamber Posted October 6, 2018 Share Posted October 6, 2018 I have a 7800 that doesn't respond to 7800 controllers correctly, in 2600 mode controllers work fine, but 7800 action buttons don't respond unless the game supports 2600 controllers. The problem is not the controllers, they work fine on other systems. Both ports are effected. Anyone experience a problem like this before. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted October 6, 2018 Share Posted October 6, 2018 Just so I understand... a 2600 game any controllers work just fine and there are no issues. a 7800 game, only the directional controls work and the neither of the two fire buttons work unless the game also happens to support 2600 controllers for a single fire button mode? That is kinda a new one on me, but anything related to the controllers not working correctly, I always point to the TIA and RIOT since they each control different aspects. Fire button issues especially point to the TIA as that chip controls fire buttons and paddle control. Speaking of..have you plugged in a set of paddles to see if they work? Quote Link to comment Share on other sites More sharing options...
masschamber Posted October 6, 2018 Author Share Posted October 6, 2018 (edited) That makes sense the fire buttons basically act like paddles in specific positions, right? so it could keep back compatibility. I have paddles on hand I see what happens Edited October 6, 2018 by masschamber Quote Link to comment Share on other sites More sharing options...
Trebor Posted October 7, 2018 Share Posted October 7, 2018 For some 7800 games, Difficulty Switches position matters. It can include informing a game what type of controller is connected and management of button behavior. Quote Link to comment Share on other sites More sharing options...
masschamber Posted October 7, 2018 Author Share Posted October 7, 2018 yep, bad tia, fine now, but like an idiot I did't install a socket since I had the chip out Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted October 8, 2018 Share Posted October 8, 2018 (edited) Yeah...I don't know what the hell it is with the 7800 architecture, but I honestly find more TIAs with issues on this console than I do on 2600s. My guess is that the TIAs were already NOS or just made with much poorer quality. They are also pretty susceptible to ESD from the controller ports as well and I believe this to be the main reason for why so many seem to have issues on 7800s. Glad you got it going again! Edited October 8, 2018 by -^Cro§Bow^- Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted October 9, 2018 Share Posted October 9, 2018 Yeah...I don't know what the hell it is with the 7800 architecture, but I honestly find more TIAs with issues on this console than I do on 2600s. My guess is that the TIAs were already NOS or just made with much poorer quality. They are also pretty susceptible to ESD from the controller ports as well and I believe this to be the main reason for why so many seem to have issues on 7800s. Glad you got it going again! Both my 7800's are fine, thank goodness, but I have four different 4-switch VCS/2600 variants (two Woodies, one Vader) and all three of them have had either bad RIOT chips and/or bad TIAs. None of them had the Zener diode mod recommended by the tech tip in the 2600 Field Service Manual. I strongly suspect it's due to static and the lack of sacrificial hex buffers in the circuit. I wouldn't doubt if the damaged 7800s you've found have suffered similarly. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted October 9, 2018 Share Posted October 9, 2018 Hence why I stated ESD in my post above...hehe. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted October 10, 2018 Share Posted October 10, 2018 Hence why I stated ESD in my post above...hehe. Yes, I'm aware what ESD stand for. That's why I pointed out the common lack of hex buffers in the design of both the 7800 and the 4-switch VCS variants. Quote Link to comment Share on other sites More sharing options...
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