Sega Master System issue

[eric90000]

Hey guys,

I’m having a weird sync issue with my sega master system 1 (modded with Arcade TV RGB bypass). The sync issue (wobbly screen or no sync) happens when I turn on “sync regeneration” on the gscartsw lite. Connected directly to ossc there’s no issue. I also tested the sync regeneration on a crt and it works perfectly both on and off, so I know it’s the ossc that doesn’t like the signal.

I was wondering if anyone else experienced this with the Arcade TV board? I have sync regeneration on for all my other consoles and it works fine into the ossc,just SMS giving me issues.

Here is a video of the ossc when using the SMS with sync regeneration on, on gscartsw lite – https://youtu.be/-FwqSZhX6-A. As you can see sometimes is syncs (and will give slightly wobbly screen) but more times it doesn’t sync and the ossc screen flashes.

Cable is RBG SCART csync genesis 1 from retrogamingcables.co.uk. Has 470ohm resistor and 220uf cap in scart head.

Cheers guys

[BuckoA51]

You shouldn’t need sync regeneration with OSSC, I can’t 100% remember but wasn’t that basically just putting the signal through an additional LPF?

[eric90000]

You’re probably right, I’m pretty sure all the other consoles will work ok with sync regen off, so I’ll leave it off for now and see what happens. It’s actually a digital Altera chip I believe, that detects sync signal in, converts it to voltage perfect csync and outputs it.

[paulb_nl]

Have you tried changing settings in the Sync opt. menu?

[Author]

Posts