Shift838 Posted October 27, 2022 Share Posted October 27, 2022 Does anyone have a wiring diagram to use Sync On Green for the Geneve 9640? Quote Link to comment Share on other sites More sharing options...
+FarmerPotato Posted October 27, 2022 Share Posted October 27, 2022 7 minutes ago, Shift838 said: Does anyone have a wiring diagram to use Sync On Green for the Geneve 9640? As in, a circuit to put HSYNC onto the Green channel, for monitors that require that? (The SGI folks want the opposite: sync on green monitors are hard to find.) 1 Quote Link to comment Share on other sites More sharing options...
Shift838 Posted October 27, 2022 Author Share Posted October 27, 2022 (edited) 36 minutes ago, FarmerPotato said: As in, a circuit to put HSYNC onto the Green channel, for monitors that require that? (The SGI folks want the opposite: sync on green monitors are hard to find.) i have a sync on green VGA monitor that also supports 15kHz. I am wondering if I can hook the Geneve up to it. would it be as simple as to hook the csync over to green? Edited October 27, 2022 by Shift838 Quote Link to comment Share on other sites More sharing options...
Shift838 Posted October 28, 2022 Author Share Posted October 28, 2022 (edited) So I got it to work but I still need to get it a bit clearer. The monitor I found is a Dell E1912H. I just hooked up: Geneve VGA 2 4,6,7,8 7 3 (Blue) 6 2 (green) 5 1 (red) 8 csync 2 this works to a point. No ghosting or characters shaking. Produces good color, but there are vertical lines going from top to bottom. So, I need to figure that out. but I’m closer! I think tomorrow I will add a LM1881 Sync Separator in the circuit to see if that cleans it up. Edited October 28, 2022 by Shift838 2 Quote Link to comment Share on other sites More sharing options...
+dhe Posted October 28, 2022 Share Posted October 28, 2022 Great idea @Shift838 Much much better than my approach soldering the whole thing up (say serial cables) and hoping it worked. I never though of prototyping the connections on a breadboard. Excellent! 1 Quote Link to comment Share on other sites More sharing options...
+FarmerPotato Posted October 28, 2022 Share Posted October 28, 2022 yay, good progress! without looking at the signals levels, I guess you have the green + CSYNC mostly adding, maybe fighting each other a bit. how about just a voltage adder on G and CSYNC? With a LM1881 you get VSYNC separate but doesnt SonG need you to sum up (G+ H + V) ? I’m new to all this. Quote Link to comment Share on other sites More sharing options...
Shift838 Posted October 28, 2022 Author Share Posted October 28, 2022 1 hour ago, FarmerPotato said: yay, good progress! without looking at the signals levels, I guess you have the green + CSYNC mostly adding, maybe fighting each other a bit. how about just a voltage adder on G and CSYNC? With a LM1881 you get VSYNC separate but doesnt SonG need you to sum up (G+ H + V) ? I’m new to all this. you are right, SoG does require H and V signals combined into CSync. Are you talking about using maybe on OpAmp for the voltage adder circuit? Do you have a reference for me to look at? I'm also new to SoG! Quote Link to comment Share on other sites More sharing options...
Shift838 Posted October 28, 2022 Author Share Posted October 28, 2022 7 hours ago, dhe said: Great idea @Shift838 Much much better than my approach soldering the whole thing up (say serial cables) and hoping it worked. I never though of prototyping the connections on a breadboard. Excellent! Breadboards are awesome for proving your design. 1 1 Quote Link to comment Share on other sites More sharing options...
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