Show HN: Level – a new demo for 8bit Atari XL/XE https://ift.tt/s4ROHW9

Show HN: Level – a new demo for 8bit Atari XL/XE Hey, During the weekend there was a demoscene Lost Party 2026 in Poland and demo-group Agenda released there a new demo for Atari XL/XE. The demo is using PAL blending graphics mode (not frame blending) to increase perceived number of colors. The link is to WASM emulator (AltirraSDL) with enabled CRT effects to get it closer to how it looks like on a real hardware. Demo requires 320KB of RAM for preloading purposes only (no effect requires more than 64KB of RAM) - on Atari, in contradiction to, Commodore 64 you cannot do well parallel loading to playing demo effects. Happy watching and feel free to ask any questions. https://ilmenit.github.io/level-by-agenda/ July 13, 2026 at 03:18AM

Show HN: Web App Uses RTL-SDR to Align HDTV Antenna https://ift.tt/8UCckXr

Show HN: Web App Uses RTL-SDR to Align HDTV Antenna I was sick of losing the Telemundo signal during World Cup, so I built a Web App that uses a local RTL-SDR dongle to analyze the HDTV signal and help you point your antenna... GOAAALLLL! https://tunerscope.com/ July 12, 2026 at 11:34PM

Show HN: Levee – a self-tuning circuit breaker and concurrency limiter for Go https://ift.tt/Aqs2Rig

Show HN: Levee – a self-tuning circuit breaker and concurrency limiter for Go Rate limiters and circuit breakers work wonderfully well when they’re configured for the load and available capacity. But load, capacity, and latency drift over time, and keeping those settings current requires continuous effort. So I built Levee to be a hands-off, adaptive, easy to configure traffic governor. Levee is configured with a success-rate target and timeout. It then continuously monitors the workload performance characteristics to detect downstream capacity exhaustion or failures. It can also spot a surge from growing concurrency before failures arrive. It runs in-process, uses a small, fixed amount of memory, has zero dependencies, and processes millions of requests per second. In a deterministic 10-node mesh simulation, Levee outscored carefully tuned static rate limiters/breakers deployed throughout the mesh, while recording fewer failures and no node crashes. https://ift.tt/vS8aDoW July 11, 2026 at 10:22PM

Show HN: Dotenv-Diff v3.0.0 https://ift.tt/vwVmkRe

Show HN: Dotenv-Diff v3.0.0 Long time since i last posted updated about dotenv-diff, a lot of new features since then https://ift.tt/xzbMDRA July 7, 2026 at 05:54PM

Show HN: Krbn, a pencil-style 3D renderer with SVG output https://ift.tt/0842kyg

Show HN: Krbn, a pencil-style 3D renderer with SVG output Krbn is a childhood dream I finally got to research & prototype (from a hospital bed of all places), during a medical break from my normal work: a rendering engine that draws 3D scenes the way a technical sketch artist would. It asks "which lines would an artist draw and what would they leave out?" Basically strokes are derived exactly from geometry, rather than sampling. True conics, quartics etc. So there is no shading model, it's replaced by hatching (either flat or following the curvature of the object). There's no alpha channel, the gaps between lines do the work as on paper. It introduces hand-wobble (which is seeded, so animations don't "boil" between frames) and various other things; the example gallery shows more. With all that, output is byte-stable, i.e. two successive renders will cause zero changes in Git. Full disclosure, since it matters here: this was built with significant AI assistance, deliberately, as an experiment in how far a carefully directed human-AI collaboration can get on a hard rendering problem. The briefs are in the repo - judge for yourselves. Gallery: https://ift.tt/n2oTZ5p The longer story: https://ift.tt/Ozj5Wl9... P.S. There's no pitch here... just an invitation for a weekend skim over something I find fascinating. https://ift.tt/96lKkV0 July 11, 2026 at 02:51AM

Show HN: @playbykey/theory - Music theory TypeScript engine and MCP server https://ift.tt/dF9guVo

Show HN: @playbykey/theory - Music theory TypeScript engine and MCP server https://ift.tt/wIF05hZ July 10, 2026 at 11:15PM

Show HN: Opula – portfolio and net-worth analysis as a hosted MCP connector https://ift.tt/IHaXcoB

Show HN: Opula – portfolio and net-worth analysis as a hosted MCP connector https://opula.io July 10, 2026 at 10:22AM