Fable 5.2 designs a full CPU from 147 lines of code, verified on 242,400 random instructions
IgorCarron · x · 2026-11-11
A demo shows CPU designed by Fable 5.2 from just 147 lines of description code: 6,258 logic gates and 1,023 memory cells, verified against a reference model on 242,400 random instructions with zero mismatches. Placement and routing covered 7,281 cells with wiring 5.5x shorter than random layout. It prints text on its own and runs Game of Life on a 32×32 display — 300 generations, still zero mismatches. Not taped out to silicon yet, but the design holds up gate-by-gate in simulation.
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