dbrll/Xortran
View on GitHub ↗ ★ 34 Fortran
A backpropagation neural network for the punch-card era
3 mentions on Hacker News by 1 person: 1 story, 2 comments · first 2025-11-11 · latest 2026-06-08
20082026
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…to run backpropagation in the 1960s and small Transformers in the 1970s (I'm the author of both): https://github.com/dbrll/Xortran (backprop on IBM 1130, 60s) https://github.com/dbrll/ATTN-11 (Transformer on PDP-11, 70s) What was missing…
comment by rahen · 2026-06-08 · in The Smallest Brain You Can Build: A Perceptron in Python -
…it, instant Github star. I wrote an MLP in Fortran IV for a punched card machine from the sixties ( https://github.com/dbrll/Xortran ), so this really speaks to me. The interaction is surprisingly good despite the lack of attention…
comment by rahen · 2025-12-29 · in Show HN: Z80-μLM, a 'Conversational AI' That Fits in 40KB -
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Xortran - A PDP-11 Neural Network With Backpropagation in Fortran IVstory by rahen · 2025-11-11 · 11 comments