A Monitor Already in Every Home
With video outputs came the ability to use ordinary television sets as computer monitors. Enterprising businesspeople manufactured "RF modulator" boxes for the Apple II that converted composite video into a signal that simulated an over-the-air broadcast--something a TV set could understand. The Atari 800 (1979), like video game consoles of the time, included an RF modulator in the computer itself, and others followed. However, bandwidth constraints limited the useful output to low resolutions, so "serious" computers eschewed TVs for dedicated monitors.