[kens]

The explanation for why they chose this printer is in a conference paper published in the National Telesystem Conference, 1982. Unfortunately, I can't find these conference proceedings anywhere (even in physical form). If anyone happens to have a copy lying around...

[1] https://ui.adsabs.harvard.edu/abs/1982ntc..confR...4S/abstra...

[jdblair]

I couldn't resist searching myself. It looks like there is a physical copy of the conference proceedings in a library in Japan!

https://topics.libra.titech.ac.jp/recordID/catalog.bib/BA902...

[Maxion]

Let's hope the internet can connect us with someone who lives near by and has a ibrary card!