Target — CP/M (+cpm)
SkillProductivityLets your agent build C programs for classic CP/M systems using the z88dk compiler with the right CPU and library options.
Available today. Use it from your connected AI after setup.
No other account needed.
Connect ahel once, and every AI you use reads what you have installed.
Then ask your AI: use the Target — CP/M (+cpm) skill
About this capability
z88dk +cpm only: classic vs newlib CP/M, clib/CPU variants (8080/8085/z180), subtypes as packaging (not “newlib”), FCB disk, .com builds. Use when the task is explicitly +cpm / CP/M, not generic targets.
What this skill tells your AI
The instructions your AI receives, as published by z88dk/z88dk in .agents/skills/target-cpm/SKILL.md and read by ahel’s review.
| Config | lib/config/cpm.cfg |
| Tree | libsrc/target/cpm/ (classic + newlib share tree; list isolation) |
| Wiki | wiki/platforms/Platform---CPM.md |
| Help | zcc +cpm -h (authoritative subtype list) |
Two worlds (do not mix cores)
| Classic | Newlib | |
|---|---|---|
| Select | default / -clib=default / 8080 / 8085 / z180 / ixiy / ansi | -clib=new / sdcc_ix / sdcc_iy |
| CRT | lib/target/cpm/classic/cpm_crt0 | libsrc/target/cpm/cpm_crt.asm.m4 |
| Lib | -lcpm_clib, -lcpm8085_clib, … | -lcpm + sccz80/sdcc_ix clibs |
| Headers | include/ | include/_DEVELOPMENT/common/ |
| Disk | classic FCB fcntl | newlib FCB (asm_target_open_*); FatFs separate optional stack |
| CPUs | multi (Z80, 8080, 8085, Z180, …) | Z80-class only |
Hard rule: one open owner per binary. Do not link classic fcntl with newlib cpm_01_file. See libsrc/target/cpm/README-mixed-tree.md.
Subtypes
- Mostly disc / packaging (
-Cz+cpmdisk,.com), not “newlib selector”. - Default subtype →
.com-style (-Cz+newext … .com). - Some subtypes force CPU/clib (e.g. 8080 machines,
bondwell2→ ixiy). Read the subtype line incpm.cfg. - Suites: prefer default subtype only unless a specific machine is in scope (
library-newlib/methodology-measure).
Recipes
zcc +cpm -vn hi.c -o hi -create-app # classic Z80 → .com
zcc +cpm -clib=8085 -vn hi.c -o hi -create-app
zcc +cpm -clib=new -vn hi.c -o hi
zcc +cpm -clib=sdcc_iy -vn hi.c -o hi -create-app
zcc +cpm -clib=8085 --math32 … # math32_8085 via ZCC_LIBCPU
Agent checklist
- Confirm classic vs newlib before editing CRT/stdio/fcntl.
- 8085 CP/M is classic — no newlib product.
- Do not fan out 100+ subtypes in tests.
- Related skills:
library-classic,library-newlib,cpu-8085,tool-appmake.
Signals
- GitHub stars
- 1k
- Forks
- 206
- Last commit
- Sep 2026
Advanced
- Catalog kind
- skill
- Gateway key
target-cpm- Source
- github.com/z88dk/z88dk