How do I install the Target Zxn skill?

Run npx skillmds@latest add z88dk/target-zxn in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Target Zxn free to use?

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Who published Target Zxn?

z88dk (@z88dk) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Target Zxn by z88dk — Agent Skill

Name: Target Zxn
Author: z88dk

File contents

Target — ZX Spectrum Next (`+zxn`)


Config	`lib/config/zxn.cfg`
Trees	`libsrc/target/zxn/`, `libsrc/newlib/target/zxn/`, `examples/zxn/`
Headers	`include/arch/zxn.h` (nextreg, copper, MMU, …)
Wiki	`wiki/platforms/Platform---ZX-Spectrum-Next-zxn.md`
CPU skill	`cpu-z80n` (Next opcodes, nextreg, copper)
Help	`zcc +zxn -h`

Not 48/128 (`+zx`)

Bare +zxn is Next. Do not use zx_clib, +zx subtypes, or Spectrum-only recipes.

Defaults (critical)

Option	Default in `zxn.cfg`
CPU	`-mz80n`
CLIB	`sdcc_iy` (newlib + reserve IY)
SUBTYPE	`default` → appmake `+zxn`
Defines	`__ZXNEXT`, `__Z80N`, …

So bare zcc +zxn … is newlib, not classic.

CLIB map

CLIB	World	Notes
`classic`	classic	name is `classic`, not `default`; `-lzxn_clib -lndos`; `z80n_crt0`
`new`	newlib	sccz80
`sdcc_ix` / `sdcc_iy`	newlib	both use `lib/clibs/sdcc_ix` products; IY reserved on `sdcc_iy`

Subtypes

Subtype	Role
`default` / `zxn` / `tap`	Next packaging (`+zxn`)
`bin`	`--bin`
`sna` / `snx`	snapshots
`nex`	`.nex` for NextOS / emulators
`dot` / `dotx`	esxDOS DOT
`dot-n` / `dotx-n` / `dotn` / `dotn-n`	DOT/DOTN + NextOS defines

Classic disk often needs -lesxdos (default classic still has ndos stubs).

Recipes

zcc +zxn -vn hi.c -o hi -create-app                    # newlib sdcc_iy
zcc +zxn -clib=classic -subtype=nex -create-app …
zcc +zxn -clib=new -subtype=nex -create-app …
zcc +zxn -subtype=dot -create-app …

Hardware-facing code

Need	Where
Next opcodes (`mul de`, `nextreg`, …)	`cpu-z80n`, assemble `-mz80n`
NextReg / MMU / copper symbols	`include/arch/zxn.h`, `config_zxn.h`
Copper program model	`cpu-z80n` § Copper + https://wiki.specnext.dev/Copper

Agent notes

Always -mz80n for Next-only opcodes (already in OPTIONS).
Float A/B on Next: math32_z80n when measuring HW mul.
Related: cpu-z80n, library-newlib, tool-appmake.

---name: target-zxndescription: z88dk +zxn only: ZX Spectrum Next. Default -mz80n and newlib sdcc_iy, classic via -clib=classic, NEX/DOT packaging, nextreg/copper via cpu-z80n. Use when the task is explicitly +zxn / Next, not +zx.---# Target — ZX Spectrum Next (`+zxn`)| | ||--|--|| Config | `lib/config/zxn.cfg` || Trees | `libsrc/target/zxn/`, `libsrc/newlib/target/zxn/`, `examples/zxn/` || Headers | `include/arch/zxn.h` (nextreg, copper, MMU, …) || Wiki | `wiki/platforms/Platform---ZX-Spectrum-Next-zxn.md` || CPU skill | **`cpu-z80n`** (Next opcodes, nextreg, copper) || Help | `zcc +zxn -h` |## Not 48/128 (`+zx`)Bare `+zxn` is **Next**. Do not use `zx_clib`, `+zx` subtypes, or Spectrum-only recipes.## Defaults (critical)| Option | Default in `zxn.cfg` ||--------|----------------------|| CPU | **`-mz80n`** || CLIB | **`sdcc_iy`** (newlib + reserve IY) || SUBTYPE | **`default`** → appmake **`+zxn`** || Defines | `__ZXNEXT`, `__Z80N`, … |So bare `zcc +zxn …` is **newlib**, not classic.## CLIB map| CLIB | World | Notes ||------|--------|--------|| **`classic`** | classic | name is **`classic`**, not `default`; `-lzxn_clib -lndos`; `z80n_crt0` || `new` | newlib | sccz80 || `sdcc_ix` / `sdcc_iy` | newlib | both use **`lib/clibs/sdcc_ix`** products; IY reserved on `sdcc_iy` |## Subtypes| Subtype | Role ||---------|------|| `default` / `zxn` / `tap` | Next packaging (`+zxn`) || `bin` | `--bin` || `sna` / `snx` | snapshots || **`nex`** | `.nex` for NextOS / emulators || `dot` / `dotx` | esxDOS DOT || `dot-n` / `dotx-n` / `dotn` / `dotn-n` | DOT/DOTN + NextOS defines |Classic disk often needs **`-lesxdos`** (default classic still has ndos stubs).## Recipes```textzcc +zxn -vn hi.c -o hi -create-app # newlib sdcc_iyzcc +zxn -clib=classic -subtype=nex -create-app …zcc +zxn -clib=new -subtype=nex -create-app …zcc +zxn -subtype=dot -create-app …```## Hardware-facing code| Need | Where ||------|--------|| Next opcodes (`mul de`, `nextreg`, …) | **`cpu-z80n`**, assemble `-mz80n` || NextReg / MMU / copper symbols | `include/arch/zxn.h`, `config_zxn.h` || Copper program model | **`cpu-z80n`** § Copper + https://wiki.specnext.dev/Copper |## Agent notes1. Always **`-mz80n`** for Next-only opcodes (already in OPTIONS). 2. Float A/B on Next: `math32_z80n` when measuring HW mul. 3. Related: `cpu-z80n`, `library-newlib`, `tool-appmake`.

Frequently asked questions

Target Zxn