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Introducing 0x1DE

July 21, 20260x1DE

0x1DE (“oxide”) is the editor half of the toolchain — a VS Code / VSCodium extension that pulls FantASM and Bizmuth into your editor. It’s available now.

What it does

  • FantASM language support — an LSP client for the FantASM assembler: diagnostics, hover, completion, signature help and go-to-definition on your .asm files, plus a status-bar indicator.
  • Bizmuth debugging — set breakpoints in your source and step through it running on the emulated ZX Spectrum Next: source-level breakpoints (banking-correct and conditional), stepping, registers, flags and memory (read and write).

That’s the whole loop in one editor: write → assemble (FantASM) → run & debug (Bizmuth).

Get it

  • Install from Open VSX — the VSCodium marketplace; it stays updated from there.
  • Or grab the .vsix (0.1.2) from the Downloads page for a manual or offline install.

Point it at a built fantasm binary, run Bizmuth with its debug server, and you’re debugging Z80 on emulated Next hardware without leaving your editor.