It's alarming to think how much data from less than 20 years ago exists perfectly well, in a well-understood digital format, and yet is marooned on obsolete hardware (or system software) with little way of getting off it. Thus, so much data faces extinction due to the shifting of technologies. It's not just reading old programs off 400K Macintosh disks either; try reading an old Microsoft Word 1.0 document you wrote ~20 years ago, for example.
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