This is one variant of the RGBtoHDMI device that, in combination with a Raspberry Pi Zero, allows mono or luma-encoded video signals from vintage computers to be converted to an HDMI signal for use with modern monitors and TVs. This latest variant now also supports adding audio from the vintage machine to the HDMI output signal.

This device was designed specifically for use with either true monochrome video sources or with other devices that generate a custom video signal that can be decoded to a color display. One such devices would be a Commodore C64 equipped with the VIC-II-dizer add-on.

The analog audio signal can be picked up and fed into the RGBtoHDMI using the provided cable. This cable has two RCA input plugs (white for lumacode, red for mono audio). It depends on your retro machine how it actually provides its audio signal. You may need additonal cabling or adapters for that.

To get a working RGBtoHDMI upscaler, you need a Raspberry Pi Zero (any variant) with necessary accessories: Micro SDcard, Mini HDMI cable, USB power supply. You can also get/make the optional device case.

The latest stable release of the software can be obtained from the releases page . Copy the content of the .zip archive directly into the root of the (FAT32 formatted) SDcard. No special boot image is needed. For newest features (like initial support for audio), use the latest beta release.