Reply To: Sega Master System on NTSC Model 1 MD/Gen — Intermittent Black Screen

[megari]

Hi @d020!

Hmm, that doesn’t look like expected behavior. Can you tell us more about your setup, please?

I see in your video you have two screens side-by-side. I’m assuming at least the left one is connected to the Koryuu somehow, and the right one looks like a CRT of some sort? Could you describe in detail how the two screens are connected to the MD, and what hardware you have in your video path between the console and the screen(s), please?

Is the console unmodded? Asking this because region mods can affect video timings, although it seems that the output is native to the console (NTSC 240p/480i, possibly line-doubled/deinterlaced to 480p?), and there is color, implying the color subcarrier is derived from the main crystal frequency correctly.

Does the intermittent black screen only occur when running Master System games on the MD, or with MD/Genesis games, too? IIRC, Master System games may have some unusual video modes and/or timings, so that could be a factor.

Are you running the original firmware on your Koryuu? If so, would you be willing to try a newer Release Candidate version, which is most likely going to be very similar to the next official release? It has a lot of bugs fixed, and some new features, too.

I would be delighted to hear any and all reports about Koryuu behavior and compatibility with different kinds of hardware, be they consoles, retro computers, video scalers/line multipliers, transcoders, displays etc. I have been actually hoping for volunteers to pop up. 🙂