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PC Engine with RGB modded Interface Unit

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This topic contains 11 replies, has 2 voices, and was last updated by  Nioreh 4 days, 20 hours ago.

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  • #17090

    Nioreh
    Participant

    I have the white PC Engine and CD with the interface unit RGB modded.

    Has anyone gotten this console to work properly? I get sync issues, with dropouts and the top part of the image being wavy. I’ve seen other reports of this wavy thing on BVMs with certain consoles that have crappy sync output.

    I tried running it through the sync strike. It got a little better, but still drops out for a second maybe every 10 seconds or so. That is the best I have been able to get it playing with the settings. (Firmware is 0.78a)

    With the sync strike and the AV3 interlacefix option turned on, the wavy top disappears. Dropouts keep happening though.

    #17098

    BuckoA51
    Keymaster

    Is your analogue sync LPF set to max?

    #17099

    Nioreh
    Participant

    Yeah, I have it set to max

    #17123

    BuckoA51
    Keymaster

    Who modded your interface unit?

    #17144

    Nioreh
    Participant

    It is by an ebayer called 8bitterz.

    I have opened the unit up and checked the wiring. It seems the RGB lines go from the expansion port of the console through one of these amps:
    RGB AMP

    And the sync signal I think is straight from the expansion port (Can double check later, at work at the moment). Does the sync line need anything inline with it to be up to spec?

    #17151

    BuckoA51
    Keymaster

    Hmm, I’m uncertain but usually sync on PC Engines is kind of wonky (if you think OSSC is problematic try going back to the XRGB3 days)…

    Someone like Voultar would be the person to ask, I’ll see if I can get in touch with him.

    #17217

    BuckoA51
    Keymaster

    Ok, Voultar got back to me, he says “If csync is being grabbed directly from the expansion port and not buffered out, it isn’t going to get along with most equipment”. Please can we have a picture of the expansion port wiring?

    #17222

    Nioreh
    Participant

    Thank you. It looks like I was mistaken. Sorry for confusing everyone. The sync line comes off the same connector as the sub board for the A/V out, which leads me to believe the sync is actually composite video?

    The yellow wire on the left is going from this connector pad directly to the RGB out sync pin (8 pin DIN connector, looks like it’s wired the “standard” way). The black, white and red wires seem to be ground plus left and right audio.

    Ladda upp bilder gratis på Forumbilder.se

    Should I maybe rewire this to use the sync out from the expansion connector, with something on the way? I see that Voultar sells a board for the PC engine with buffering for sync and 75 ohm. The wiring is quite horrible on this mod, and the AMP is just kind of hovering on top of everything, so I’m thinking about redoing the mod anyway.

    Here is the RGB amp used in the mod

    Ladda upp bilder gratis på Forumbilder.se

    Here is what is soldered to the expansion pins. Only R, G, B comes off here. Plus +5V and ground.

    Ladda upp bilder gratis på Forumbilder.se

    • This reply was modified 5 days, 17 hours ago by  Nioreh.
    #17227

    BuckoA51
    Keymaster

    Images are kinda dark I’m having trouble making it out but I’ve asked Voultar again 🙂

    #17229

    Nioreh
    Participant

    Yeah sorry about the image quality. I have no good lighting and only my cell phone. But the important part that you hopefully can see is the yellow wire on the first image. That is the bottom side of the board, on the other side is the connector that goes of to the A/V out sub board (with composite
    and audio out). It is tapped off of that connector, with nothing else on the line.

    #17235

    BuckoA51
    Keymaster

    Voultar has spoken:-

    “The board placement is horrible. All sorts of things are going to couple into his video. Honestly, it just needs to be completely redone, Aand that board needs to be positioned in a healthier area.”

    #17242

    Nioreh
    Participant

    Haha, ok. I guess I’ll order Voultars PCE board and redo the mod. Thank you!

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