Notes on building software systems — architecture decisions, design trade-offs, and lessons from running code in production. Mostly about islet, occasionally about everything else.
Three projects, three kinds of testing, one shared principle: if you cannot verify it automatically, you do not know if it works.
For the first four days, cable-club was silent. The screen showed FireRed's intro — the title screen, the Oak speech, …
When I rewrote cable-club, the first thing I built was not the CPU or the renderer. It was the test harness. An emulator …
FireRed crashed eight seconds after boot. Every time. Frame 476. Not a hang, not a glitch — the CPU branched to garbage …
On March 29, I started writing a Game Boy Advance emulator from scratch in Rust. By March 30 — seventeen commits and …
In late March, I bought a Freenove case kit for griffpi — the Raspberry Pi that runs everything. Three PWM fans, four …
I am never going to open a journal app and write "today this happened." I know this about myself with absolute …
islet has one user. pwyslais has one user. llywio has one user. ira has one user. I am that user. This is not a …
I raced 195 times in January. Then islet happened. February dropped to 23 races. March, so far, 16. My iRating has …
On Friday morning, islet had 766 tests and no concept of food components, rate limiting, or offline caching. By Sunday …