How do I install the Target Zx skill?

Run npx skillmds@latest add z88dk/target-zx 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.

Is Target Zx safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Target Zx?

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 Zx free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Target Zx?

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

Target Zx by z88dk — Agent Skill

Name: Target Zx
Author: z88dk

File contents

Target — ZX Spectrum 48/128 (`+zx`)


Config	`lib/config/zx.cfg`
Trees	classic `libsrc/target/zx/`; newlib `libsrc/newlib/target/zx/`
Headers	classic `include/arch/zx/`; newlib `_DEVELOPMENT/common`
Wiki	`wiki/platforms/Platform---Sinclair-ZX-Spectrum.md`
Help	`zcc +zx -h`

Not Next

	`+zx`	`+zxn`
Machine	48/128 Spectrum	Spectrum Next
Default CLIB	classic `default`	newlib `sdcc_iy`
CPU in OPTIONS	Z80	`-mz80n`
Appmake	`+zx`	`+zxn` (`.nex`, …)

Do not copy Next subtypes (nex, snx, dotn) onto +zx.

Defaults

Item	Value
CLIB	classic `default` → `-lzx_clib -lndos`
SUBTYPE	`default` → `-Cz+zx`
Math (classic native)	`Z88MATHLIB=mzx` / `__MATH_ZX`

Classic vs newlib

World	Select	Notes
Classic	omit / `-clib=default` / `ansi` / `noclib`	Main Spectrum path; examples under `examples/spectrum/`
Newlib	`-clib=new` / `sdcc_ix` / `sdcc_iy`	CRT `zx_crt.asm.m4`; `-lzx`

Disk: classic default links -lndos (stubs). Real FS on the command line, searched first: -lesxdos, -lp3, -lzxmdv, -lzxbasdrv, … Never put -lndos before a real driver.

Subtypes (packaging)

Subtype	Role
`default`	TAP-style via `+zx`
`wav` / `turbo`	audio loaders
`sna`	snapshot
`bin`	raw binary
`rom` / `if2`	ROM cartridge
`dot` / `dotx`	esxDOS DOT (`startupoffset` 0x100 / 0x200)
`plus3`	+3 loader pragma
`zxvgs`	ZX VGS packaging

Recipes

zcc +zx -vn hi.c -o hi -create-app
zcc +zx -clib=ansi -create-app …
zcc +zx -lp3 -create-app …                    # real +3 FS
zcc +zx -clib=sdcc_iy -create-app …
zcc +zx -subtype=sna -create-app …

Agent notes

Graphics / engines under libsrc/target/zx/ (bifrost, nirvana, ulaplus, …) — match neighbour usage.
Related: cpu-z80, library-classic, library-newlib, tool-appmake.

---name: target-zxdescription: z88dk +zx only: ZX Spectrum 48/128 (not Next). Classic default, newlib optional, -lndos stubs vs real FS (-lesxdos/-lp3), TAP/SNA/DOT packaging. Use when the task is explicitly +zx / Spectrum 48/128, not +zxn.---# Target — ZX Spectrum 48/128 (`+zx`)| | ||--|--|| Config | `lib/config/zx.cfg` || Trees | classic `libsrc/target/zx/`; newlib `libsrc/newlib/target/zx/` || Headers | classic `include/arch/zx/`; newlib `_DEVELOPMENT/common` || Wiki | `wiki/platforms/Platform---Sinclair-ZX-Spectrum.md` || Help | `zcc +zx -h` |## Not Next| | **`+zx`** | **`+zxn`** ||--|-----------|------------|| Machine | 48/128 Spectrum | Spectrum Next || Default CLIB | classic **`default`** | newlib **`sdcc_iy`** || CPU in OPTIONS | Z80 | **`-mz80n`** || Appmake | `+zx` | `+zxn` (`.nex`, …) |Do **not** copy Next subtypes (`nex`, `snx`, `dotn`) onto `+zx`.## Defaults| Item | Value ||------|--------|| CLIB | classic **`default`** → `-lzx_clib -lndos` || SUBTYPE | **`default`** → `-Cz+zx` || Math (classic native) | `Z88MATHLIB=mzx` / `__MATH_ZX` |## Classic vs newlib| World | Select | Notes ||-------|--------|--------|| Classic | omit / `-clib=default` / `ansi` / `noclib` | Main Spectrum path; examples under `examples/spectrum/` || Newlib | `-clib=new` / `sdcc_ix` / `sdcc_iy` | CRT `zx_crt.asm.m4`; `-lzx` |**Disk:** classic default links **`-lndos`** (stubs). Real FS on the **command line**, searched first: **`-lesxdos`**, **`-lp3`**, **`-lzxmdv`**, **`-lzxbasdrv`**, … Never put `-lndos` before a real driver.## Subtypes (packaging)| Subtype | Role ||---------|------|| `default` | TAP-style via `+zx` || `wav` / `turbo` | audio loaders || `sna` | snapshot || `bin` | raw binary || `rom` / `if2` | ROM cartridge || `dot` / `dotx` | esxDOS DOT (`startupoffset` 0x100 / 0x200) || `plus3` | +3 loader pragma || `zxvgs` | ZX VGS packaging |## Recipes```textzcc +zx -vn hi.c -o hi -create-appzcc +zx -clib=ansi -create-app …zcc +zx -lp3 -create-app … # real +3 FSzcc +zx -clib=sdcc_iy -create-app …zcc +zx -subtype=sna -create-app …```## Agent notes1. Graphics / engines under `libsrc/target/zx/` (bifrost, nirvana, ulaplus, …) — match neighbour usage. 2. Related: `cpu-z80`, `library-classic`, `library-newlib`, `tool-appmake`.

Frequently asked questions

Target Zx