Falonn Posted June 24, 2020 Share Posted June 24, 2020 On 6/22/2020 at 11:27 PM, ChildOfCv said: WTF. So there's a numbering standard called EIA-96 that has the "benefit" of requiring you to look up the conversion value. <slow clap> I'd been wondering why the 75Ω output resistors I've been using were labeled "85X". How "helpful" of them. ? Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 24, 2020 Author Share Posted June 24, 2020 (edited) 10 hours ago, ChildOfCv said: Bypassing R1 on the PSI board with a jumper wire help? Here is my RGB board like this, so how do I bypass R1 with a jumper wire? Edited June 24, 2020 by Retro_Game_Lover96 Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 24, 2020 Share Posted June 24, 2020 4 hours ago, Retro_Game_Lover96 said: Here is my RGB board like this, so how do I bypass R1 with a jumper wire? Find a short length of wire, strip both ends. Place one end on one side of R1. Place the other end on the other side of R1. Alternatively, you could use your meter probes by sticking them on both sides of R1 and then angling both probes so that they contact each other. Alternatively, set the meter in amps mode, make sure the probes are plugged into the appropriate outlets for reading amps (some meters use an alternate outlet), and then put a probe on each side of R1. Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 24, 2020 Author Share Posted June 24, 2020 5 hours ago, ChildOfCv said: Find a short length of wire, strip both ends. Place one end on one side of R1. Place the other end on the other side of R1. Alternatively, you could use your meter probes by sticking them on both sides of R1 and then angling both probes so that they contact each other. Alternatively, set the meter in amps mode, make sure the probes are plugged into the appropriate outlets for reading amps (some meters use an alternate outlet), and then put a probe on each side of R1. I tried, but it didn’t work. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 24, 2020 Share Posted June 24, 2020 32 minutes ago, Retro_Game_Lover96 said: I tried, but it didn’t work. No change then? Tracing back on other hardware. What RGB mod do you use on the NES? Is it NESRGB? And is its sync output set for TTL or 75 ohm? Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 24, 2020 Author Share Posted June 24, 2020 The NESRGB, the one's I did not mod has the SNES styled multi out connector. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 24, 2020 Share Posted June 24, 2020 37 minutes ago, Retro_Game_Lover96 said: The NESRGB, the one's I did not mod has the SNES styled multi out connector. The mod has a jumper to set the style of sync, so it would be instructive to find out what that jumper is set on. Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 24, 2020 Author Share Posted June 24, 2020 29 minutes ago, ChildOfCv said: The mod has a jumper to set the style of sync, so it would be instructive to find out what that jumper is set on. Hmmmm Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 25, 2020 Author Share Posted June 25, 2020 I think I have heard some people added the trimmer pot for the sync on the RGB board. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 25, 2020 Share Posted June 25, 2020 6 hours ago, Retro_Game_Lover96 said: I think I have heard some people added the trimmer pot for the sync on the RGB board. That might be a useful addition. I guess it replaced R1 maybe? Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted June 25, 2020 Author Share Posted June 25, 2020 (edited) Well, have you seen some other work that people did? https://circuit-board.de/forum/index.php/Thread/17431-Colecovision-Ti99-RGB-MOD-Projekt/ https://imgur.com/dGSlk4p https://imgur.com/a/2G7K2 I think the trimmer pot for the sync that has 103 code, so that should be 10k ohms. Edited June 25, 2020 by Retro_Game_Lover96 Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 27, 2020 Share Posted June 27, 2020 Okay, looks like they're replacing R23 with the potentiometer. And 10K is a reasonable choice. The first link also leaves out R1 completely, but that may not be necessary. Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted July 1, 2020 Author Share Posted July 1, 2020 That was a relief. I got that mod working. 2 Quote Link to comment Share on other sites More sharing options...
MrPix Posted July 3, 2020 Share Posted July 3, 2020 Sweet deal! I'm glad you got this working. Sorry for standing on the sidelines and being able to offer any input. If all I have is guesses, I'm not adding anything. Quote Link to comment Share on other sites More sharing options...
Retro_Game_Lover96 Posted August 29, 2020 Author Share Posted August 29, 2020 Well, I did the TMS RGB mod on my ColecoVision, and it is a lot better than the other one, so it is an easy installation. 1 Quote Link to comment Share on other sites More sharing options...
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