July 26, 2026
Big chip energy
Show HN: Discrete6502 – one thing led to another
Someone rebuilt a famous old computer brain by hand, and the crowd wants even more chaos
TLDR: A creator rebuilt a legendary old computer processor as a huge, working board you can actually watch in action. Commenters loved the madness but immediately pushed for even more spectacle, from extra blinking lights to a hilariously wasteful vacuum-tube version.
A hardware maker just did the kind of thing that makes the internet stare, squint, and then yell "wait, you did WHAT?" They rebuilt a real MOS 6502 — the tiny processor that helped power classics like the Apple II, Commodore 64, and Nintendo Entertainment System — not as a software copy, but as a giant physical board covered in thousands of parts. It’s basically the same old computer brain, blown up to paper size, slowed way down, and made visible with lights so you can literally watch it think.
But of course, the real show is the peanut gallery. One camp instantly went full goblin mode: more LEDs! One commenter loved the glowing spectacle but demanded even more blinking so you could watch the clock signal race through the machine, then half-joked that someone should invent transistors with built-in lights. That mood pretty much sums up the thread: awe, then immediate feature requests. Another commenter escalated the madness beautifully by suggesting the next version should use vacuum tubes instead of modern parts — and be powered by the kind of diesel generator hospitals use in blackouts. In other words, the community saw a wildly over-the-top retro project and said, "Cool. Make it even more absurd."
That’s the vibe here: admiration mixed with gleeful one-upmanship. The builder made an old chip visible and tangible; the commenters turned it into a festival of nerdy excess, power-hungry jokes, and demands for maximum blinkiness.
Key Points
- •Discrete6502 recreates the MOS 6502 as a physical transistor-level board using discrete SOT-323 components rather than simulation or emulation.
- •The board preserves the original 6502 die layout by placing components according to coordinates derived from photographs of a decapped chip.
- •The design keeps the original dynamic NMOS logic, replacing depletion-mode load devices with 1,023 10 kΩ resistors and expanding 778 bidirectional pass transistors into 1,556 transistor pairs.
- •The finished system runs at roughly 10–20 kHz, much slower than the original 1 MHz 6502, to make operation observable.
- •The board was generated by scripts from the visual6502 netlist and validated through simulation, connectivity checks, and design-rule verification before fabrication.