Printing "Hellorld!" on a DEC PDP-8! | My Answer to Usagi Electric's "Hellorld!" Challenge

Today we print "Hellorld!" (no, that's not a typo) on a DEC PDP-8. In not one, not two, but THREE different ways!
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A couple of years ago, vintage tech YouTuber Usagi Electric picked up a rather unique item: an obscure minicomputer from the late 70s/early 80s called the Centurion. The machine was in pretty sad shape: neglected, filthy, and in need of restoration and repair. And indeed he embarked on an epic restoration of this wonderful machine. And along the way, he had to, for all intents and purposes, reverse engineer the thing. Because this thing was pretty obscure; there was almost nothing about it available on the Interwebs. So reverse engineer it he did, along with the help of dozens of other hackers and vintage tech enthusiasts all across the globe.

During the restoration/repair, he needed a way to test the machine; and so one of the people helping out with the project came up with the machine language code to print the traditional "Hello world!" message. Except when Usagi typed it in, he made a slight error, and instead of printing "Hello world!" it printed "Hellorld!" And thus, a meme was born. Well Usagi embraced the meme. (And so did I. I now use "Hellorld!" whenever I need to test a new language, or a computer that I am restoring, etc.) And he has put forth a challenge: to print "Hellorld!" on whatever rare/vintage/custom/obscure/etc. hardware you have at hand. And this is my response to said challenge.

Centurion videos playlist:
   • Centurion Minicomputer  

Centurion Wiki:
https://github.com/Nakazoto/Centurion...

Usagi Electric's "Hellorld!" Challenge:
https://github.com/Nakazoto/Hellorld/...

#usagielectric #retrocomputing #hellorld