jamieshaw
commented
3 months ago Also noticed that the angle of the interference differs on different colour background — not sure if that's indicative of anything. (Screenshot is PAL again).
Yellow and grey seem to go from top left to bottom right (\\\) Red and magenta seem to go from top right to bottom left (///), at a shallower angle. Green almost looks like a mix of both…
Apologies to raise an issue on this project about an installation rather than the build of the mod itself, just looking for some advice and this seemed like a good place to start. I'm experiencing some faint diagonal bars, most noticeable on grays, following installation of this mod — but only in PAL mode.
I've installed a recent version of this board into a SNSP-CPU-1CHIP-01 console following all the relevant instructions as detailed in this repo for that particular revision, including colour carrier and CSYNC on pin 3.
Along side this, I've completed the following:
For reference, the SNES is outputting via a RetroGamingCables NTSC CSYNC (attenuated) cable to an OSSC 256 optimised. I can see that the VMODE is correctly switching on the S-CPUN on pin 111, as sd2snes' system information view reports the correct Hz. Similarly, I can see that the OSSC is also getting the same, so assume the correct mode is being set in S-RGB on pin 9.
Installation seems sound and everything is continuous as expected, so not sure what the issue could be. Seems like some frequency is bleeding into a line somewhere, that's causing interference when in 50Hz.
What I do notice is that without any cart, switching on the SNES produces a very noisy black screen. Not sure if that's expected or not…
Not sure if anyone has experienced a similar issue and might be able to provide some insight?
More comparisons: https://files.sha.wtf/jamie/waNESebi11.jpg https://files.sha.wtf/jamie/VoQIQONo49.jpg https://files.sha.wtf/jamie/QOQuPodi10.jpg