Reply To: OSSC Fails to sync

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5v sync output is expected from arcade boards that are designed for TTL load. However, sync signal is often driven by a logic chip which have limited driving strength – with a 75ohm load instead of proper high impedance load, the chips typically can output only around 1Vpp which should be still safe for most video-level inputs. I’ve not heard anyone damaging ossc sync input with any console yet, but arcade boards are naturally more likely to contain strong sync buffers. External buffers like this should also be avoided with scart inputs.