Hackaday Podcast: 1-bit CPU from 1970s gets unexpected revival, QR codes get hacked

The latest episode of the Hackaday Podcast, number 383, has hosts Elliot Williams and Tom Nardi covering a wide range of tech projects and news. The episode kicks off with excitement about the newly announced 2026 Retrocomputing Challenge, which is expected to draw retro computing enthusiasts.

The conversation then moves to several interesting hacks of the week. These include efforts to improve desktop 3D printing by adding lasers, an expensive grill equipped with an ESP32 controller running open source firmware, and open source tools designed for cavers and underground exploration. The hosts also discuss impressive techniques to squeeze more utility out of the common QR code, pushing its capabilities beyond standard use.

In the Quick Hacks segment, Elliot and Tom share their picks: turning PVC pipes into flat stock for various projects, old-school Radio Shack electronic kits that helped teach electronics fundamentals, and VR soldering demonstrations that offer a new way to learn the skill. The episode wraps up with a look at the latest developments in over-the-counter hearing aids, which are becoming more accessible and advanced.

The standout topic of the episode is the 1-bit CPU that, nearly 50 years after its release, is enjoying an unexpected and growing fandom among hardware enthusiasts. This simple processor, originally from the 1970s, is being rediscovered and hacked by a new generation.

The mailbag segment includes responses to listener letters: Alexander praises the purchase of ultrasonic knife guts, Joey asks about adding video visuals to the podcast (which the hosts admit would be difficult), and there is a call for listeners to submit intro/outro music for the show.