# Episode 168 - Halt and Catch Fire

Page: https://stenobird.com/podcast/advent-of-computing-497186/episode-168-halt-and-catch-fire
Text version: https://stenobird.com/podcast/advent-of-computing-497186/episode-168-halt-and-catch-fire.md
Podcast: [Advent of Computing](https://stenobird.com/podcast/advent-of-computing-497186)
Published: 2025-10-19T23:03:00+00:00
Episode link: https://adventofcomputing.libsyn.com/episode-168-halt-and-catch-fire
Audio file: https://traffic.libsyn.com/secure/adventofcomputing/ep168_halt_and_catch_fire.mp3?dest-id=1206722
Processing state: not_requested
JSON: https://stenobird.com/v1/public/podcasts/advent-of-computing-497186/episodes/episode-168-halt-and-catch-fire
Duration seconds: 1605

## Resource

Imagine a secret number that could be used to bring your computer to a screeching halt. In 1977 Gerry Wheeler discovered an interesting feature of Motorola's new 6800 microprocessor. There was a secret instruction that, if read, would cause the processor to stop working. He called this magic number Halt and Catch Fire, or HCF, and wrote a neat article about the operation. This was the first time the public would learn about the secret powers of HCF, but this isn't actually the beginning of the story. When it comes to HCF things are more complicated than that... but only a little bit!

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## Transcript

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