RGBtoHDMI Video Converter for Vintage Computers

The RGBtoHDMI is a specialized video converter designed to connect vintage computers to modern HDMI displays. Based on the open-source project by David Banks (Hoglet67) and Ian Bradbury (IanB), this device converts TTL video signals from classic systems into crystal-clear HDMI output using a Raspberry Pi Zero and programmable logic IC.

Why you want it: PIXEL PERFECT OUTPUT! Looks like an emulator output!

Features

• Optimized for 9-pin D-Sub video connections (MDA, CGA, and EGA)
• Integrated 12-bit TTL buffer for signal integrity and protection
• Compact, desk-friendly form factor

Package Contents

Pre-assembled RGBtoHDMI PCB Raspberry Pi Zero Case flat ribbon cable with 9-pin DSUB connector 8GB SD Card Micro USB Power Supply

Full unit. No assembly required. The output of the raspberry pi zero is on miniHDMI so you will need a miniHDMI to HDMI cable or suitable adapter.

The CPLD is flashed with the last version. The product has been tested on an MDA and CGA machine.

Technical Specifications

Power Requirements: 5V DC, 500mA minimum (1100mA recommended) Video Input: 9-pin D-Sub connector Video Output: Mini-HDMI Compatible with TTL signals up to 12-bit

Compatibility This adapter is designed to work directly with vintage computers using a 9-pin D-Sub connector, including:

PC clones (MDA, Hercules, CGA, or EGA) Olivetti Prodest PC1 Commodore 128 (80-column mode)

Additional systems can be supported with custom cables, including Apple II series, TRS-80 Model 3, Sinclair machines, and many others. The software includes specific profiles for specialized hardware like the Tandy 2000 hi-res CGA adapter and Tseng Labs ET3000AX.

Usage Connect the device to your HDMI monitor and power source, then use a straight-through 9-pin D-Sub cable to connect your vintage system. The on-screen menu allows you to select appropriate video profiles and sub-profiles for different video modes. Profile updates are available through the project's GitHub repository.