This brings back memories. In the late eighties, I wrote a program similar to this one for archiving one Apple II floppy disk on a sheet of paper. One floppy

This brings back memories. In the late eighties, I wrote a program similar to this one for archiving one Apple II floppy disk on a sheet of paper. One floppy disk is 140 kilobytes (35 tracks of 16 sectors containing 256 bytes each), so a sheet of paper with a 7-inch by 10-inch printed area needs a data density of just 2 kilobytes per square inch to fit a floppy disk, which comes out to a linear resolution of 128 dots per inch. This was (barely) within the specs of my dot matrix printer. I was a teenager at the time so I had no clue about error correcting codes and the like, it was a straight bit-to-pixel mapping. At the time, this was a write-only medium, as I did not have access to a scanner. No matter, I used it to archive my most important data disks, figuring that after a few years, technology would have improved enough to allow easy scanning. I eventually lost the sheets of paper, but the floppy disks themselves were robust enough to last until 1994, at which time I wrote a program to send them to my PC through a null-modem connection.