Hacker News new | ask | show | jobs
by Brian_K_White 43 days ago
For me that is blue leds.
3 comments

Yes! I remember thinking "damn you band gap physics, if we only had blue leds we could do colour displays with LEDs, but that can never happen."
"rareleds" on Instagram is fantastic. Vintage LEDs set to apex twin and so on
Haha, for me it was "LEDs".
Up until I was about 10 or 12 we only needed to dial 4 digits.