The No-CPU Amiga Demo Challenge
12 days ago
- #Demo
- #No-CPU
- #Amiga
- Open challenge to create demos running entirely on Amiga custom chips without CPU involvement.
- Repository includes rules and a runner application for launching no-CPU demos.
- Dedicated no-CPU Amiga demo competition at Gerp 2026 (January 23-25, 2026).
- Invitation demo (a no-CPU demo) released at Evoke 2025 with source code available.
- Encouragement to comment on demo announcements via the demo announcement issue.
- FAQ available for additional information.
- Aims to explore the power of Amiga custom chips (Alice, Lisa, Paula) without CPU assistance.
- No-CPU demo format: raw memory image defining initial chip memory and hardware registers.
- Runner application loads memory image; must work with official runner to qualify.
- Memory size limits: 512k (OCS), 1MB (ECS), 2MB (AGA).
- Audio filter disabled as it's controlled via CPU-accessible CIA registers.
- Initial hardware register contents specified for compatibility.
- Demo can signal end by clearing Blitter Nasty flag.
- Feedback sought on rules/runner limitations and security holes in the sandbox.