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Thread: Chorma mono to RCA

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    Default Chorma mono to RCA

    Hello,

    I have a small problem....my brother dropped my Commodore 1802 monitor on the floor.

    It is badly broken inside and outside, so it can't be repair.

    I was using it with a single Chroma mono output wire.

    If there a way to convert the Chroma mono output to an RCA or Coax. The thing is I don't want to buy an old Commodore 1802 monitor anymore, I would like to use a new monitor.

    I already tried to hooked up the Chroma mono to a normal monitor through the RCA video and it didn't work really good. I could see the image but it wasn't steady/stable...i.e. the image was moving enough that I could'nt read the text.

    Thanks you for your help!

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    Mono? No no..

    Chroma
    Luma

    Two wires, Luma is sync and intensity (aka, black and white signal), chroma is the color sub carrier.. together it makes a color picture.

    You can turn the "Seperate Video" (S-Video), into "Composite" video, which is what you want.

    I'll need to find those schematics.

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    I have only 1 cable that goes to the monitor.
    It was working really good before the accident....

    All I need to see it white text.
    So that's why I use Chroma mono.

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    mono isn't a picture term though, so you make no sense.

    Commodore 64 outputs TWO types of picture formats (depending on version of the C64).

    Composite Video
    S-Video (In the form of TWO RCA jacks)

    And it has 1 audio line, once in again, in the form of 1 RCA jack. That would be your mono, an audio line.

    I'd know this, I have a C64 at my desk on right now...

    If you want to convert it to COAX (RF - 75 ohm), you'll need an RF modulator, and grab the Composite video and audio line to modulator.

    However! C64 S-Video cables are yellow white red colored..

    Yellow: Luma
    Red: Chroma
    White: Audio

    To even get a picture, you need LUMA. Chroma alone will not give you a functioning picture, sorry.

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    Mono = monochrome, actually.

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    I never said that i had a Commodore 64...I have a Commodore Monitor that's it!

    I have something else hooked you to it that has only 1 wire and it is the Chroma mono one!

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    Quote Originally Posted by FABombjoy View Post
    Mono = monochrome, actually.
    Oh yea, forgot about monoCHROME.

    though, in the industry, it's called Luma, hence I forgot that term.

    This post is still very confusing, without knowing what he actually has, wants to do, or whatever, this is hard to figure out..

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    Yeah, I've been trying to piece it together, too

    What is this "something else" that you're trying to hook up?

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    It is a kind of odd system!

    Not even a gaming device..it is for my company!

    I have an old Japan machine from the 80's. The only wire that comes off the system to see the date needs to be hooked up to a Commodore 1802 monitor...with only 1 wire!

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    We still would like to know what make/model this machine is, otherwise we can't help you without knowing what and how the heck it hooks up.

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    Quote Originally Posted by evildragon View Post
    We still would like to know what make/model this machine is, otherwise we can't help you without knowing what and how the heck it hooks up.
    Perfect! I will let you know guys monday!

    Thank you for your help!

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    Strawberry (Level 2) phreak97's Avatar
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    heres my understanding:
    you have a machine from japan which outputs a monochrome (chroma) video signal through one wire. you were using it with a commodore monitor before, but now you cant and you want to use it with your tv instead. when you plug it into the yellow connector on your tv you get a rolling or flickering picture.

    now, from this i can almost definately say youre in a PAL country (what country do you live in?).

    the problem is that japanese video works at 60Hz, and european types work at 50Hz
    the commodore monitor has a V-hold knob, which adjusts the Hz value the monitor is looking for, so you can use a chroma signal from any device no matter where it's from.
    if your tv has a v-hold adjustment then you can use that to fix the problem. otherwise you can check the tv menu to see if theres an option (look for "colour system" or something like that) to change the tv to ntsc. it might be that your tv does support international formats, but because youre using a monochrome signal it's getting confused.

    if your tv has neither of these, im afraid the device will not work on your tv. you'll have to look for a tv which it will work on, most sony trinitron's should work.. but the only way to tell for sure is to try it. (or if youre buying a new tv, ask the salesperson if it supports 60Hz video or ntsc video)

    the other possibility is that the divice itself could be modified to output 50Hz, but we wont know unless you tell us the model numbers etc, and if its as unusual a device as you say, it's possible nobody will know anway.

    in the end it might be cheapest to just buy another commodore monitor.

    i hope i've helped.
    Last edited by phreak97; 03-26-2008 at 10:23 PM.

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    a monochrome signal would be a luma signal though..

    this post is all far too confusing.

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    Strawberry (Level 2) phreak97's Avatar
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    :/ youre right.
    i think its just a confusion of labling though.. in effect we're looking at a black and white composite video signal im pretty sure... it doesnt matter what we're calling it, thats just a technicality:P

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