ntsc video ttl? (in console>matrix>tv setups)

[chelseayr]

if I had rgb-outputting nintendo consoles through an extron/kramer video matrix directly outputting to pretty much any friendly tv/pvm screens, do I need to do anything for ttl levels or theres no issue in the first place?

I've so far noticed a few forum threads about high ttl levels but these apparently were being outputted to an intermediate device instead of directly to the screen

[NewSchoolBoxer]

PVMs take TTL level sync no issue. What I do from my SNES. Consumer CRTs, which is mostly to say Euro SCART and [non-PVM] RGB-modified CRTs, don't expect TTL level. It's kind of a landmine of speculation saying what will happen in that case so I'd rather avoid. Naturally sync from Composite Video or Luma or Green is 75 ohm.

You're correct to bring up Nintendo consoles. Pin 3 on NTSC non-1CHIP SNES, N64 and GameCube is TTL that modern RGB cables use. Modded RGB NES pulls TTL CSYNC right from the chip. RetroRGB points out that Sega Genesis 1 / Mega Drive 1 is TTL sync too.

[chelseayr]

thanks for letting me know newschoolboxer :-)

[nmalinoski]

if I had rgb-outputting nintendo consoles through an extron/kramer video matrix directly outputting to pretty much any friendly tv/pvm screens, do I need to do anything for ttl levels or theres no issue in the first place?

I've so far noticed a few forum threads about high ttl levels but these apparently were being outputted to an intermediate device instead of directly to the screen

Obviously verify with the target device's documentation, but I think a good rule of thumb is that anything receiving RGBS through DE-15/VGA or BNC connectors expects TTL sync, while anything receiving RGBS through SCART expects 75Ohm, video-level sync.

For example, if you have a PVM/BVM or a CrossPoint with BNC inputs, you can reasonably expect to need to feed it TTL sync. If you have an OSSC, Framemeister, or TV with a SCART input, you can reasonably expect to need to feed it 75Ohm sync.

Boosting 75Ohm for TTL devices is not always needed, but attenuating TTL for 75Ohm devices is needed. You can either fit a resistor in one of the SCART heads or use something like a BNC inline attenuator (Retro-Access used to sell something like this).