Cable ready tv with just the one plug instead of three colored plugs is there an adapter you can buy to play your Xbox 360 on that tv?

You're likely describing a TV with a coaxial cable input (the single, round plug), which is a very old technology. Unfortunately, you won't be able to directly connect an Xbox 360 to that type of input.

Here's why and what you can do:

* Signal incompatibility: Coaxial cables carry an analog signal, while the Xbox 360 outputs a digital signal (HDMI, component, or composite).

* Adapters won't work: There are no adapters that can convert a digital signal to an analog coaxial signal.

Your options:

1. Get a new TV: The most straightforward solution is to buy a modern TV with HDMI or component video inputs. These are the most common connections used for gaming consoles.

2. Use a TV with composite video input: If you have a TV with a yellow composite video input (usually accompanied by red and white audio inputs), you can connect the Xbox 360 using a composite cable (sometimes referred to as AV cable). The quality won't be as good as HDMI, but it will work.

3. Use a converter: While there are no adapters, you might find a converter box that takes the Xbox 360's digital output and converts it to an analog signal compatible with your TV's coaxial input. However, the video quality will be significantly degraded, and these devices are often unreliable.

Recommendation:

Given the limitations and quality issues, getting a new TV with HDMI or component inputs is the best solution. It will provide the best picture quality and ensure you can connect all your modern devices.