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FAQ.md

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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. 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
  • chriz2600 wrote the FPGA and ESP firmware