Homebrew tools for retro development

TwistedRaven is one person building the retro-development tools I always wished I had — an assembler, a language and an emulator, made for the fun of it.

Bizmuth

v0.9.4-beta4

Run & debug

A cycle-accurate ZX Spectrum Next emulator with a source-level debugger, breakpoints and scripting.

The Bizmuth emulator →

FantASM

v1.7.5

Assemble

A cross-platform Z80 assembler — the complete Z80 and Z80N instruction set, macros, structs and Rhai scripting — with first-class ZX Spectrum Next support.

The FantASM assembler →

Zinc

In development

Write

A modern, Rust-flavoured language that compiles straight to Z80 — high-level ergonomics, no runtime overhead.

The Zinc language →

Other tools

0x1DE

Extension

The VS Code / VSCodium extension — FantASM language support and Bizmuth source-level debugging in your editor.

Get 0x1DE →

Rookery

macOS

A macOS menu-bar host for a Gitea act_runner — keeps a self-hosted CI runner connected.

About Rookery →

Latest news

All news →

Jul 23, 2026

Rookery

Rookery 1.0.0 is available

Rookery 1.0.0 is available to download — the first stable, notarized release of the macOS menu-bar host for a Gitea act_runner.

Jul 23, 2026

Bizmuth

Bizmuth 0.9.4-beta4 is available

Bizmuth 0.9.4-beta4 is available to download.

Jul 22, 2026

Rookery

Introducing Rookery

Rookery is a small new tool — a macOS menu-bar app that gives a self-hosted Gitea act_runner a permitted home on your Mac, working around macOS Sequoia’s Local …

Early days yet — three tools so far, and more whenever the itch strikes.