Well, the Dover was the first device (that I know of) that could print _very_ high-quality graphical/multi-font output, and on ordinary paper. It was also pretty darned fast - a couple of seconds per sheet, IIRC. The whole package just blew us all away (I was a MIT when we got ours). There was a prior device (from quite a few years before) called a 'Xerox Graphics Printer', but i) IIRC it printed on thermal paper (think poor-quality thermal fax paper); ii) the resolution was nothing like as high as that of the Dover (which was, IIRC, in the 100's of DPIs - which it needed to produce the very-high quality printout with type-faces), and iii) it was quite slow. What they did with the Dover was take a high-end Xerox copier (one of the things the size of a couple of desks),and rip out the optical front end (which copied an image of the page being copied, onto the drum), and replaced it with a scanning laser that was fed an amplitude-controlling bit-stream Right, a couple of years later Xerox, DEC and Intel did a consortium to make Ethernet widely available, and produced the 10Mbit version. Technically, it was little different from the 3MBit version. The low-level packet format was different (because of the higher speed, and larger maximum size), and the addresses used the later PARC thinking (UID's for interfaces), but those were not major changes. Yeah, I just found a piece, I'll put up a photo. The CATV that used a heavy foil ground layer. Vampire taps worked fine on 3MB Ethernet. As the speeds went up, less so. Nothing of the 3MB, and it doesn't show how the clamp-on connector and vampire worked. Noel