Python running on the Super Nintendo (in-browser demo)
MicroPython (lexer, compiler and VM) on the SNES: 3.58 MHz 65816, 56 KB Python heap, 16-bit int. The REPL runs right inside the post via EmulatorJS and also works on real hardware via flashcart. I did this as a benchmark for Claude Fable. When the export ban hit, switching to Opus got the project stuck for three weeks; Fable came back and found the real bug in ninety minutes. Along the way: 23 compiler bugs and 4 MicroPython bugs, each root-caused with a minimal reproducer and filed upstream. If you run it on real hardware, I want a picture!
Python running on the Super Nintendo (in-browser demo) launched on July 6, 2026 with 7 votes, #2,664 of 24,623 launches that month and more than 75% of that year's launches.
What it does
A 3.58 MHz CPU, an export ban, and five words that got real Python running on a Super Nintendo.
Python on the SNES has been a dream of mine for a long time. My brother and I shared a SNES as kids, and Python was my professional home for a big part of my career. These days I barely touch code anymore, so the dream has somehow lost its relevance. Then Claude Fable 5 came out, and I thought: this would make a great benchmark for the model. Porting MicroPython to the SNES: a 3.58 MHz CPU, 128 KB of RAM, 16-bit int , and a niche C compiler . This might just barely be possible. So on the very first day of Fable’s release, I started. By the evening, it had built a hello-world ROM, a compiler self-test that had already caught two real compiler bugs, and all of MicroPython’s core…from fabian-kuebler.com
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Source: Show HN post ↗
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