+grips03 Posted February 15, 2016 Share Posted February 15, 2016 Can someone check the voltage on pin 9 of controller port 1 and 2 on a 2600? Quote Link to comment Share on other sites More sharing options...
+grips03 Posted February 16, 2016 Author Share Posted February 16, 2016 + or - .001vdc Quote Link to comment Share on other sites More sharing options...
alex_79 Posted February 16, 2016 Share Posted February 16, 2016 I'm not very expert in electronics, but why do you want to measure the voltage on that pin specifically?It is connected to a capacitor and to one of the TIA inputs. The voltage of the pin depends on what controller was connected to the port (paddles and keypads apply power to that pin and so charge the cap) and what game is running (paddle games periodically discharge the cap and then measure the time it takes to recharge through the paddle controller). Moreover I expect that the multimeter itself will discharge the cap quite quickly even if there's some voltage left on it, so I think the reading won't be of much use... Quote Link to comment Share on other sites More sharing options...
BigO Posted February 16, 2016 Share Posted February 16, 2016 Essentially, that pin connects to a TIA I/O pin. With no load on that pin, it should be either a logic 0 level or a logic 1 level or a high impedance (input mode) which theoretically puts it at 0, or +5. Maybe some residual charge on the capacitor. As a general statement, I don't know that I could determine anything by taking a DC measurement there without having software specifically configure the TIA output pin. Not intentionally being unhelpful. I'm just not sure that a random voltage reading at pin 9 without software to specifically configure the TIA pin behind it would be particularly telling. .001, I would take to be an active logic 0 or that I was looking at a pin configured in input mode. Quote Link to comment Share on other sites More sharing options...
BigO Posted February 16, 2016 Share Posted February 16, 2016 Maybe if you share what you're up to, I might be of more help. Quote Link to comment Share on other sites More sharing options...
+grips03 Posted February 17, 2016 Author Share Posted February 17, 2016 Maybe if you share what you're up to, I might be of more help. all good won't be needed for what I'm working on Quote Link to comment Share on other sites More sharing options...
BigO Posted February 17, 2016 Share Posted February 17, 2016 all good won't be needed for what I'm working on Sounds like something fun. Quote Link to comment Share on other sites More sharing options...
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