# DCHDMI/DreamcastHDMI FAQ

## What is it?

DCHDMI is an internal HDMI output solution for the Dreamcast.

## Why do we need this, there are already the Behar Bros Akura DC HDMI Box and the Pound HD Link Cable for Dreamcast?

- DCHDMI is a full digital to digital solution. It takes the signals directly off the GPU (Holly) and the audio processor (AICA) before entering video and audio DACs.
- DCHDMI fixes the Dreamcast's aspect/pixel ratio issue, by converting the weird Dreamcast 480p signal and converts it to a fully HDMI compliant 640x480 (CEA-861-D format 1) signal including accurate pixel clock/sync timing.
- DCHDMI supports pixel doubling to 960p and 960p in a 1080p frame.
- DCHDMI also handles 480i and 240p content.

## What's about the original analog output?

The original audio/video DAC remains untouched, so analog output works as before.

## Does it support higher resolutions e.g. 2160p output?

No, there are currently no HDMI 2.0 ICs freely available. They require to have a HDMI/DCP license.

## Will feature XY be added in the future?

- If demand for a specific feature is high enough, it may be added in the future by the creators.
- The project and all parts of it are or will be available as open source software, so everyone is invited to participate in this project!
- An easy to use firmware upgrade path will allow existing owners to install new firmware versions.

## Is it easy to install?

If you are not familiar with fine pitch soldering, no.

## Do I have to cut holes?

Yes, one hole is located here: https://i.imgur.com/jWIlyiM.jpg

There is a 3d printed jig to aid in drilling hole so you can't mistakenly mess up.

## Where can I buy it?

DCHDMI will be available ready for install on [shop.dansprojects.com](https://shop.dansprojects.com/). Currently the release is planned for Q4.

## Who are the people behind it?

- citrus3000psi designed the hardware and will also sell DCHDMI through his website: [shop.dansprojects.com](https://shop.dansprojects.com/)
- chriz2600 wrote the FPGA and ESP firmware