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Unfortunately, the problem with this approach is that machines take up a lot of space; they are prone to deterioration over time (whereas data can be copied and refreshed into new portable media as necessary); when deterioration occurs, it is arguable whether new parts will be found.
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A more pressing concern is deterioration of storage media itself. CD-ROM discs can last a while, sure. Cartridges with the game stored on read-only chips should also be rather durable. But floppy disks deteriorate quite easily - in some cases becoming unusable within less than half a decade.
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Some scholars have suggested that the "look-and-feel" of a game is more important than anything else. Hence, they suggest using emulation to simulate aspects such as how the game looked on a CRT monitor as opposed to an LCD display. Also, emulate the behaviour of input, such as a trackball mouse as opposed to a modern laser one. As gamers, do you think these are inportant?
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Emulating the behavior of the display device is - in my opinion - generally redundant for computer software unless there is a significant difference in how the game is rendered on modern displays (mostly a non-issue). Earlier machines which utilized a TV screen as their output method may however benefit from that to some degree.
The sound hardware has to be emulated, as that is one of the most common problems with the compatibility between these games and modern operating systems.
Far as I see it, there is little to no practical difference between the behavior of the old fashioned ball mice and modern optical or laser ones - same goes for most input devices, really.