I put a RGB bypass on my GPM-02 and noticed the signature CPU noise. Is there any way to fix it? Thanks in advance.paulb_nl wrote:I think the artifacts you are getting is CPU activity noise. Its more easily seen with the OSSC 256x240 optimized mode. I have captured a video with reverse LPF set to max so the noise can be clearly seen: https://youtu.be/syOW-w1q5UASamIAm wrote: I also replaced my APU's regulator and have mostly eliminated the big vertical stripe. What I haven't eliminated is a minor amount of diagonal noise. Again, I'd suggest looking at the FF6 title screen instead of LttP, because with all of my modifications so far, I get a perfect LttP title screen yet a slightly fuzzy FF6 title screen. I also still get weird artifacts near the top of the screen when the main FF6 logo appears.
If you take a look at this video where they visualize the CPU instructions timing you can see the noise looks exactly like that. https://youtu.be/Q8ph2OVqZeM?t=8m18s
There is no noise at the DRAM refresh in the middle where the CPU is halted. Also what they call spinning where the CPU is waiting for something looks the same too with the diagonal lines. Once the game is waiting for controller input at the save file selection the diagonal bars go across the whole screen.
Edit: In FF6, the noise would normally be a somewhat faint grain but then once you jump into the menu, boom, full blown typical CPU noise graph in the blue background.
I tried the 7805 and S-ENC capping and there was no effect.
Adjusting Reverse LPF to 18 on my OSSC removed the smearing but actually made the CPU noise even more obvious.