An MMIX playground, playmmix, puts an MMIX machine in your browser with no install, no local setup, no build step.

MMIX is Knuth's 64-bit RISC architecture. I built checksmix to assemble and run programs for it. playmmix wraps that same engine with an editor and a live debugger, in Rust …

Meet mmixdb, part of checksmix — a Unix-style debugger for MMIX. It lets you approach your program from the point of view of the machine state and that's how MMIX is meant to work.

MMIX

MMIX is Knuth's 64-bit RISC machine, the one that replaced MIX throughout the current edition of …

Engineers write prompts as part of the job now, and being able to refer to them in an efficient manner is a valuable improvement to your workflow. Skip pasting file contents into Claude entirely: open find-file (C-x C-f) to surface the path Emacs already knows, select it and cut it …

When Claude delegates a prompt to a sub-agent, it pastes the whole prompt text into that sub-agent's context by default — thousands of tokens, duplicated, every time. Tell it to hand over a file reference instead of the copied text, and that one change alone can cut input tokens 25-40%.

The Loop

Are you the victim of a finite automation? You could be entitled to compensation!

A finite automation is a driven process that forces an outcome. An engineer is both an orchestrator and a facilitator. Facilitation always has an answer ready, orchestration has to be known. Left alone, facilitation …

I got my ⭐️...

I am not committing to the Advent of Code 2025 this year. I'm working on too many side projects checksmix, snipren, emomtimer. In fact I don't even have time to write this blog. On the other hand, I used some holiday downtime to work through Day 1 …