A custom virtual machine for the Stars! 4X game

A developer built Stars!VM, a custom virtual machine that embeds an 80286 emulator and a Win16-to-Win32 bridge to run the 1995 16-bit Windows 4X game Stars! natively on modern 64-bit Windows. The VM emulates x87 floating point directly on host hardware, validates correctness via differential fuzzing against the host CPU, and bridges DOS interrupts and handles between 16-bit and 32-bit worlds. Hot routines like the game's PRNG were reverse-engineered with an AI model (Fable 5.1) and rewritten in C as custom emulated instructions, nearly doubling turn-generation speed; buffered I/O further cut overhead. The bridge also exposes an MCP interface letting AI agents observe and drive the UI, with an AI (Opus 5) completing a full game almost autonomously. The project also reimplements the WaveMix sound DLL natively, compresses embedded game assets to shrink the binary, and cracks the original serial-code copy protection to avoid penalties for shared hardware signatures.

Source: https://nullprogram.com/blog/2026/09/17. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.