Reply To: New Koryuu test firmware 1.1-test0

[newsupermarkio]

Hi megari,

Thanks for your reply.

The PVM I’m using is the Sony 2530 (ref: https://docs.sony.com/release/PVM2030.pdf, https://cdn.retrorgb.com/assets/monitormanual/SonyPVM_2530_Service_Manual.pdf). This actually has direct S-video and direct composite inputs. It also has a DB-25 pin RGB input. My intention with the Koryuu was to get composite or S-video sources into a component switch which then feeds into the RetroTink Comp2RGB (https://www.dropbox.com/s/rnoxcaxaqljq018/Transcoder%20Manual.pdf?dl=0) and then into the PVM via the SCART to DB-25 connection. That being said, the RGsB or RsGsBs options wouldn’t work in my case.

I just re-tested direct composite input to the PVM, and that is running fine with no issue on color.

I did try running the composite input through the Koryuu, and for some reason that output was pure gray from the start. I also had an issue with the running the composite signal through a RetroTink 2x Pro to HDMI display — it was also gray. It puzzles me why the direct composite connection to the PVM is ok with color, but running through Koryuu (or even RetroTink 2x Pro) is interpreting it as grayscale.

Regarding S-video, the direct S-video connection to the PVM is ok. The S-video connection through RetroTink 2x Pro to HDMI display is ok as well.
When running S-video though Koryuu, I can get color, but it has issues. With the original stock firmware, the issue showed up quickly, and eventually most of the video signal turns gray. Strangely enough, with the updated test firmware (1.1-test0), the onset of color loss in S-video is delayed, and the problem isn’t as bad as with the original stock firmware — that’s why I suspected something changed with the interlace handling modification in the blanking interval.

I also had looked up the video chip in the CPS Changer too (CXA1645, ref: https://console5.com/techwiki/images/2/2f/CXA1645P-M.pdf). From my observations/tests, the direct video output of the CXA1645 via composite or S-video to the PVM is ok (no flicker, color loss). Maybe there is something about how the Koryuu is handling the signal output.

When the issue occurs, the picture is stable. There is some strange color flickering and or complete color loss to grayscale.
I’ll see if I can get some video clips of the issues seen later this weekend.

Thanks and Best Regards,
newsupermarkio