Install Black Dog Technology's DCDigital (formally known as DCHDMI) kit in a Dreamcast console.  This will give you 1080p HDMI output from your Sega Dreamcast console.

A comprehensive install includes the following:

• Install the DCDigital kit
• Upgrade the DCDigtal to the latest firmware
• Replace the rechargeable battery with the battery holder and new battery 
• verify operations
• If you want to replace the existing fan with a 3D mount + Noctua fan, install a modern ODE (MODE or GDEMU), or any other straight forward mod, I will do so at no extra charge if parts provided at the same time

NOTE(S):

• A working Dreamcast must be provided
• The DCDigital kit must be provided by the customer
• Any other specific mods must be provided by the customer at the same time