I tried the PS1 and PS2 over scart and it worked fine. I tried the Genesis and it worked fine. The PC Engine worked fine after removing the adapter. I haven’t went back and tried the SNES and N64 yet, just haven’t had time. I went back to Retro Access and realized that I could have potentially ordered a cable that wouldn’t work with the N64. This still doesn’t explain why the SNES isn’t working, the cable seems fins since the NES worked.