Ahh I see thank you for the input as I didn't see a use for it.
Thats 100% correct!Unless you have a F3 you DON'T have a use for it.
Make sure your HAS is on 75ohm and Csync is set to buffered and try AV1.
Buffered won't work with every PCB, in fact OSSC tends to dislike buffered/regenerated sync honestly (it also dislikes stripped syncs).I recommend always starting with unprocessed, then moving to buffered and finally regenerated (but in that order, if it locks on one STOP your done).
If for some reason you don't have a SCART cable, you can try AV3, but then you need to put it on TTL and buffered or regen.
That statement is perfect as is.
These HAS settings, with a SCART cable and AV1 on the OSSC...
WILL work with 99.9% of the arcade PCBs on the market, in fact I challenge you to find the ones that it won't (I'm sure there are a few but they are very very rare ie I've only ever seen one F3).
Also keep in mind just because you don't see anything on the TV don't mean the HAS/OSSC combo isn't working... Look at the OSSC LCD screen.
If its displaying a sync rate, its working your display is the problem (buy a freesync BenQ/Asus PC monitor or a LG C9 OLED).
Something like this...
Is so close to 60.0Hz (59.91) that it should lock on even the most picky of HDMI sets.
This however...
Is so far away from 60.0Hz (its actually closer to 50Hz) it only works on a very select few displays (aka Freesync).
It's not HAS or OSSCs fault if you have a display too strict to sync anything but 60.0hz (all your ghetto cheap TVs basically fall into this category).
If you insist on using junk LCDs that only accept 60.0Hz, then you'll need a iScan DVDO VP30/50/50pro to buffer it to 60... Or you need a xRGB mini Framemeister (also buffers out to 60).
The cost of buffering is lag, and thats in addition to any lag already present in the screen (if its cheap, its already too high).