HP-21 - Wikipedia

File:HP-HP9000-825 25.jpg - Wikimedia Commons

Alpine on a pentium system with 24 MB of RAM (custom kernel, no initrd) : r/AlpineLinux

File:HP Elitebook 8770w.png - Wikipedia

File:HP-HP9000-C110-Workstation 21.jpg - Wikipedia

Hewlett-Packard - Wikipedia

File:HP-HP1000-21MX-Computer-CPUBoard-5861-1390 05.jpg - Wikimedia Commons

HP-12C - Wikipedia

File:HP-65 white background.jpg - Wikipedia

File:Pickman's Model, 21 June 1934.png - Wikipedia

File:HP-HP1000-21MX-Computer 09.jpg - Wikimedia Commons

This Farfetch'd was just perfect for this reference.

Hewlett-Packard - Wikipedia