My first commercial 8-bit games (Sinclair Spectrum and Amstrad CPC) were developed entirely with border color as the only debugging tool. Figuring out a particu

My first commercial 8-bit games (Sinclair Spectrum and Amstrad CPC) were developed entirely with border color as the only debugging tool. Figuring out a particular stack corruption bug was a miracle, and there was at least another bug that went unfixed (just changed the level map and it stopped happening). Those were the days ahem.