HackerNews Digest

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The study examined Alzheimer’s disease (AD) mortality across U.S. occupations using National Vital Statistics System death certificates (2020‑2022). Among 8,972,221 decedents with occupational data, 3.88 % listed AD as a cause of death. Taxi drivers (1.03 % of deaths) and ambulance drivers (0.74 %) had the lowest unadjusted AD mortality rates. After multivariable adjustment for age, sex, race/ethnicity, and education, the risk‑adjusted AD death percentages were 1.03 % (95 % CI 0.87–1.18) for taxi drivers and 0.91 % (0.35–1.48) for ambulance drivers—the lowest among 443 occupations. Compared with the overall adjusted rate (1.69 %), both groups showed significantly lower odds (OR ≈ 0.56). Sensitivity analyses restricting to deaths ≥60 years, including AD as contributing cause, and comparing with other transport occupations (bus drivers, pilots, ship captains) yielded consistent results. No similar pattern was observed for vascular or unspecified dementias. Limitations include potential selection bias, misclassification of usual occupation, and under‑reporting of AD on death certificates, precluding causal inference. The findings generate the hypothesis that intensive spatial navigation in these jobs may be linked to reduced AD mortality.

The Motorola 88000 (m88k) was a short‑lived RISC family (≈1988‑1994) intended to replace the CISC 68000 line. The first generation used an 88100 CPU with optional external 88200 CMMU chips that provided cache and MMU functions on a shared P‑Bus, enabling automatic cache coherency and flexible multi‑processor designs. Speeds ranged from 16 MHz to 33 MHz. The second generation integrated cache and MMU into the 88110 core, targeting 50–100 MHz, but suffered reliability problems; production ceased when Motorola shifted to PowerPC development. Few vendors adopted m88k, notable users being Data General’s AViiON workstations, which later moved to Intel CPUs. Operating systems for m88k were proprietary (Motorola’s AT&T System III/V, Data General’s DG/UX, Omron’s UniOS) and a research copy of CMU Mach, whose source enabled an OpenBSD port. Nivas Madhur introduced OpenBSD/mvme88k in 1995, but the project stalled after his departure. Steve Murphree revived it (1998‑1999), delivering a functional kernel and userland, though compiler support was problematic: GCC 2.8 could compile, but GCC 2.95 failed to build itself for m88k, forcing continued use of the older compiler with optimizations disabled. Subsequent development faced hardware issues (SCSI termination, board instability) and required extensive manual configuration to achieve a usable OpenBSD system on MVME 187/188 boards.

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In 1999 the author’s family bought a Pentium III PC (667 MHz, 64 MB RAM) for roughly $750, a major expense for a household earning $400 per month. Maintaining the beige tower required frequent dust removal, careful handling of PS/2 connectors, trackball cleaning, monthly disk defragmentation, ScanDisk checks after crashes, and resource‑intensive antivirus scans. Internet access was via 56 kbps dial‑up, billed by the minute with strict usage caps (often ~20 hours/month); a 5 MB song needed about 15 minutes to download. Connections were used sparingly for email, news, and brief web browsing, then disconnected to conserve minutes. Online activities included learning HTML, using Photoshop for basic graphics, creating fan videos, and playing strategy games (Civilization, Age of Empires) and first‑person shooters (Counter‑Strike, Unreal, Halo). The author also experimented with script‑kiddie exploits and early malware, participated in IRC and niche forums, and downloaded cracked software and compressed media through long, unattended sessions. Email enabled covert communication with an estranged father in Brooklyn. Eventually, freelance design and e‑commerce work generated modest income, demonstrating how code could become a tangible economic asset.

The repository **verilog2factorio** (v2f) converts Verilog designs into Factorio 2.0 blueprint JSON strings and provides Rust/Lua APIs for programmatic combinator creation and simulation. Key capabilities: - **CLI**: `v2f -i -o blueprint.json` produces a blueprint; `v2f --help` lists options. - **Lua API**: functions for defining combinator networks, running simulations, and generating SVG renderings with hover‑text signal annotations. - **Rust API**: low‑level library for the same tasks. - **Development environment**: Docker‑based dev‑container or manual setup (apt dependencies, Yosys build, `cargo build --release`). `source env.bash` sets `V2F_ROOT` and adds the `v2f` binary to `PATH`. - **Workflow**: Verilog → Yosys RTL mapping (`rtl.ys`, `mapping.ys`) → `v2f` produces JSON; optional tweaking of Yosys passes is not yet supported. - **Examples**: a fully functional RV32IM RISC‑V core (including multiplication/division optimizations) with hello‑world program, a 64×32‑bit ROM, and a 32‑bit ALU; each can be simulated and visualized as SVG or animated placement. - **Simulation**: test suites include DFF/DFFE traces; SVG outputs can overlay simulation state for global visibility.

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