Yes, analogue televisions. The latest release of jwz's big boffo compedium of doovy display hacks, aka xscreensaver, has code that emulates the circuitry of a NTSC television; originally, this was intended for an Apple II emulator, including the blue/orange fringes of letters. Gradually this evolved into a general-purpose TV emulator, one which can add authentic ghosting, snow, colour distortion and other television artefacts to the JPEGs on your desktop. Which is pretty nifty, in a somewhat perverted kind of way.
As computers get faster, emulators get more and more fine-grained, and evolve from emulating the high-level behaviours of the machines to emulating their implementation, down to the electrical characteristics of the circuits. How long until we see, for example, TB-303 emulators which simulate the cheap, loose-tolerance components used in the original 303s, or analogue synth emulators that come realistically untuned as they "warm up", neatly getting rid of that unsexy digital precision?
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