The DEC Rainbow 100, released in 1982, had graphics capabilities that weren't well documented in the official manuals. While most users ran it in monochrome mode, the Rainbow supported a color graphics card that could output RGB signals, but its proprietary DB15 connector and sync-on-green signal made it incompatible with standard monitors. Hackers and enthusiasts discovered you could access additional graphics modes by directly manipulating the hardware registers. The discovery came from reverse-engineering enthusiasts who noticed the advanced capabilities hidden behind compatibility issues. Some of the best Rainbow software used these enhanced modes, creating visuals that many users never knew were possible.
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RGB Graphics On a DEC Rainbow With Reverse-Engineered Monitor https://hackaday.com/2023/09/01/rgb-graphics-on-a-dec-rainbow-with-reverse-engineered-monitor/ #ReverseEngineering #Retrocomputing #DECRainbow #vga