1. Two new features would, at minimum, be required to add to minecraft - A box for the computer, and a display for the computer.
2. The CPU box for the computer would be an item, that when opened (via command/tool/etc) will teleport the player into a new world name <computername>, this entire world would be considered the inside of the computer box, that would be filled with redstone, and probably would need to be created with some sort of generator specifications.
3. The Box's generated terrain would resemble the box and have output plugs for the monitor somewhere in the wall or wherever the mod creator would want to send display data to the monitor, as well, the computer creator would create the redstone circuitry to create the RAM PRocessor and HDD (or however far the computer builder wanted to go).
4. The mod would support a set redstone current transmission to display pixels etc depending on the mod creators method of creating the virtual monitor. Then redstone just connects the monitor to the computer and voila, a computer?
Hope this style of design might inspire some especially experienced mod developers to consider this kind of thing!
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Currently Developing the Mercurious Minecraft Server