> For the complete documentation index, see [llms.txt](https://wiki.wisdpi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.wisdpi.com/raspberry-pi/cm4-mini-itx-cluster/io-spec.md).

# IO Spec

### Back IO

![](https://389921961-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FjPowryxiQvRDiYHC9qWy%2Fuploads%2FQloz0UUmbvwcWkzMk02o%2FMain%20Board%20Back%20IO.png?alt=media\&token=a31510b4-42f3-49d6-93f3-9addbc3ce690)

### Onboard IO

<figure><img src="https://389921961-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FjPowryxiQvRDiYHC9qWy%2Fuploads%2Fe93C6TtzTwW481vqbeCm%2FMain%20Board%20Top%20View%20IO.png?alt=media&amp;token=3f9de3f7-5556-4a75-8cbd-0a8005f34fcd" alt=""><figcaption></figcaption></figure>