https://studylib.net/doc/12961413/hewle1tpackard-journal-----%3B---i---m

HEWLETT-PACKARD JOURNAL, July 1977

https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1977-07.pdf
http://hparchive.com/Journals/HPJ-1977-07.pdf

https://terminals-wiki.org/wiki/index.php/HP_2641A


TODO:
https://www.curiousmarc.com/computing/hp-264x-terminals

https://youtu.be/QikO0WOAGWI

https://en.wikipedia.org/wiki/HP_2640

https://upload.wikimedia.org/wikipedia/commons/d/db/Snow_Survey65_%2838349185954%29.jpg
HP 2640A terminal
By USDA NRCS Montana - Snow Survey65.tif, Public Domain, https://commons.wikimedia.org/w/index.php?curid=68796196

https://upload.wikimedia.org/wikipedia/commons/5/53/HP_2647A_terminal.jpg
HP 2647A terminal
By Autopilot - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=19365187

https://upload.wikimedia.org/wikipedia/commons/a/ad/HP_2621A_2647A_terminals.jpg
HP 2621A and HP 2647A
By [Tycho] talk , http://shansov.net - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=76415702