A few notes: The experimental Ethernet speed was in fact 2.94 MHz: It's the Alto clock divided by 2.
The Alto based printer was called "SLOT" -- Scanning Laser Output Terminal. It was plugged into the Alto backplane and presented itself as a hardware peripheral controlled by microcode (as was the case for all Alto I/O). It was an Alto task, of course. The vampire tap transceiver used RG-8 cable originally. That's before they added the lines around the cable and added additional shielding. The XGP was used at the Stanford AI Lab and was, as mentioned early, a dry process. And it did use a roll of paper.