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

v1.0.0-beta2

Run & debug

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

The Bizmuth emulator →

FantASM

v2.1.0

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 →

Sep 26, 2026

Rookery

Rookery 1.1.1 is available

Rookery 1.1.1 is available to download.

Sep 18, 2026

FantASM

FantASM 2.1.0 is available

FantASM 2.1.0 is available to download. !virtual places code at an address it does not yet occupy, ALIGN pads to a boundary, and an expression takes every compa…

Sep 17, 2026

0x1DE

0x1DE 0.5.0 is available

0x1DE 0.5.0 is available — the VS Code and VSCodium extension for the Spectrum-family languages. Highlighting is now generated from a language surface: one file…

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