Reply To: SNES losing sync in 60Hz only
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The effect of the short scanline on the NES is that the top of the screen wobbles a bit. If the short scanline occurs on a different line on the SNES then it could easily affect the sync instead and lose sync.
Does the OSSC lose sync though when you lose the picture? The 1-CHIP has an issue when you use a composite video sync or luma sync RGB cable where the OSSC loses sync with some games. In that case you need to increase Analog sync Vth.
If you have changed H-PLL Pre-Coast/Post-Coast from the defaults 1 & 0 that will cause the OSSC to lose sync with SNES on 240p60.
To test if it is the sync jitter you can use a 480i game or use the 240p test suite and change the video output to 480i. The SNES does not have sync jitter in 60i and 50p.
