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 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…

Sep 4, 2026

FantASM

FantASM 2.0.0 is available

FantASM 2.0.0 is available to download. The editor now answers with what the build answers. Libraries get a real interface, tests get spans and checksums, and 5…

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