https://deskthority.net/viewtopic.php?f=7&t=26004
IR PC keyboards: IBM and Quadram
https://deskthority.net/download/file.php?id=69607
https://deskthority.net/download/file.php?id=69613
https://deskthority.net/download/file.php?id=69612

https://pcmuseum.tripod.com/datavue.html
https://pcmuseum.tripod.com/datavue.jpg
Daniel Lessard

https://biosrhythm.com/?p=2652
https://biosrhythm.com/wp-content/uploads/2023/02/1125947461300658176-D6ArPtwWsAIXsSU.jpg
Paul Rickards
https://biosrhythm.com/wp-content/uploads/2023/02/1128121130714312704-D6fkL8yWkAIwcTp.jpg
https://biosrhythm.com/wp-content/uploads/2023/02/1125947461300658176-D6ArPtvWkAARWHZ.jpg