The answer: OsmAnd's custom-built Highway Hierarchy (HH) Routing. This isn't your standard routing engine; it's a ground-up redesign, meticulously engineered to overcome the unique challenges of providing advanced navigation on compact, offline-first map data.
For the Spectrum implementation, performed as a successive step, I provided much more information in the markdown file, like, the kind of rendering I wanted in the RGB buffer, and how it needed to be optional so that embedded devices could render the scanlines directly as they transferred them to the ST77xx display (or similar), how it should be possible to interact with the I/O port to set the EAR bit to simulate cassette loading in a very authentic way, and many other desiderata I had about the emulator.
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Rank-3 factorization, shared-A tied-KV, RMSNorm, tied embed, curriculum learning