No S-Video color after C64/C128 S-Video Bypass/RF Replacement C128 install

[Calab]

A while ago I purchased and installed a “C64/C128 S-Video Bypass/RF Replacement – DIY Kit” from VGP. It installed easily and I get a good composite display image through a RetroTink mini to an HDMI display. Today I tried using the S-Video output from my C128 and there is no color in the display – it is only shades of grey.

I have verified that the cable and RetroTink mini are working by using another S-Video source. Chroma on my cable does connect to pin 6 on my C128. Is there any reason that I would not be getting color through the S-Video connection of my C128?

[Calab]

I think I found the issue… dirty contacts in the socket of the C128… I’m getting color after a bit of Non-Ox and a few insertions of the plug.

[BuckoA51]

Thanks for letting us know you found a solution, if you have any more questions please don’t hesitate to post again.

[Pegafun]

Good morning, and sorry for reopening this thread. I recently purchased a Copperdragon S-Video Bypass/RF Replacement board, which I installed on a C64 250466 longboard. This board originally had a VIC-II 6569R5 chip, which I replaced with a Kawari. I see the AV signal in color, but it’s a bit saturated; however, the S-Video signal is in black and white.

According to the installation manual, the S-Video bypass board has a jumper called JPLUM1. If my board is a longboard with a VIC-II NMOS chip, it should be closed. I haven’t closed it because I’m not sure if the original VIC-II 6569R5 was an NMOS chip (what is a NMOS chip?), and as I mentioned, I replaced it with a Kawari.
Should I close JPLUM1, or leave it open? If I close it, should that solve the problem of the black and white S-Video signal?

Thank you.

• This reply was modified 3 months, 3 weeks ago by Pegafun.
• This reply was modified 3 months, 3 weeks ago by Pegafun.

[BuckoA51]

I got BetaGamma to try this and the jumper can be set either way, shouldn’t make a difference, s-video should be color with it set either way assuming you’re not trying to e.g run PAL C64 on NTSC TV or vice versa.

[Author]

Posts