Writing
The long ones. Shorter entries live in notes.
OCaml
A few months of paid work in the back of the OCaml compiler, sponsored by the OCaml Software Foundation. Square roots the chip could already do, a crash on an IBM mainframe that wrote infinity over a live data structure, and five architectures that agree about almost nothing.
Voyager FDS Emulator
The only emulator for the computer leaving the solar system. Built from original JPL documentation found in a university archive in Kansas, after NASA said no and a chain of links from a blog to Reddit to Hackaday led to a filing cabinet in Wichita. Now being put on a chip the width of a human hair.
Booth
An open-source GPU compiler written from scratch in C99. Takes CUDA, HIP and Triton and targets AMD, NVIDIA, Tenstorrent, or a plain CPU with no GPU at all. Tested by simulating nuclear reactors, because orthodox was never really the plan.
Ernest
A quantum compiler in C99 that ran a frame of DOOM on real IBM hardware, then learned to compile Fortran to quantum circuits. The whole field runs on Python, which is a strange choice for the mathematics that has been written in Fortran for sixty years.
HALMAT
Reconstructing the Space Shuttle's undocumented compiler intermediate language. All 180 opcodes across 9 classes, recovered by parsing 630 source files that nobody had touched since the 1990s. Built on Ron Burkey's Virtual AGC project.
MPB
Mainframe Package Bureau. A package manager for COBOL, HLASM, REXX, PL/I, and JCL, standing on fifty years of communal generosity that started with Arnold Casinghino mailing magnetic tapes through the post in 1975.