When I got my Apple IIc computer, it came with an A2M6020 AppleColor 13" NTSC composite monitor. However, I have not been able to get color working on it.

I don’t know if it just has a monochrome tube in it, but I couldn’t find anything about that online. It did used to belong to a business so it could be possible. I hooked my ps1 up to it and it’s still in all green.

I just need to know if it’s a possibility that it’s got some sort of monochrome tube.

  • Options: (1) Color generation broken in Apple. (2) Color decoding broken in monitor. Try to find an analog TV, connect Apple //c to it and see if you get color. Conversely, try to find something that can generate a color signal your monitor can understand, connect to monitor and see if you can get color.
    – dirkt
    Mar 3, 2023 at 7:52
  • 3
    If something was sold as a color monitor, then equipping it with a monochrome tube would be fraud. If you can make the monitor show some image, then using a magnifier glass you will surely be able to see a pattern of red, green and blue dots or stripes. A monochrome tube OTOH will have a smooth, monochrome apperance. Mar 3, 2023 at 10:21
  • The Apple IIc only produces color depending on the version: The European PAL model will only produce a monochrome signal on the composite output, NTSC versions provide a color signal. So, do you have an NTSC or PAL IIc?
    – tofro
    Mar 3, 2023 at 11:23
  • 3
    @ssokolow swapping from a color tube to a monochrome one would be MUCH more difficult than just exchanging a white monochrome with a green one. Mar 3, 2023 at 14:09
  • 4
    @help it would make more sense to conclude that the monitor is faulty and red and blue signals don't drive red and blue electron guns properly. It could just be a dirty adjustment trimmer.
    – Justme
    Mar 4, 2023 at 0:22

1 Answer 1


The Apple IIc Color monitor and the Apple IIe Color monitor both have a color disable switch in the control panel behind the flap in the front. It's the button at the right. You don't write about using that button, so maybe you are not aware about the existence / purpose of that button.

  • I was aware of the button. however when i press it it just shifts the letters to the right and stays the same color. I was able to find a tv with composite and hook it up to that and the color works just fine. I think the monitor just has a monochrome tube because i dont see any other explanation at this point.
    – help
    Mar 3, 2023 at 23:28
  • 4
    Defective red, blue gun or circuitry? I'd guess "it's broken" to be more plausible than someone putting a monochrome tube in a colour monitor.
    – dave
    Mar 3, 2023 at 23:56
  • Many monitors have pots to balance the red and blue drive level to match the get the proper shade of white. Maybe those pots went back. Mar 4, 2023 at 7:22
  • @MichaelKarcher how do i get at these pots? Where are they inside the moniter?
    – help
    Mar 30, 2023 at 17:46
  • The pots adjusting the different electron guns are typically at the "neck board". That's the PCB at the end of the picture tube. Mar 30, 2023 at 22:15

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