If you're interested in using assembler you can use Duke's printf example and follow these steps to compile and run the program.

1. Download the asm5900 assembler and the printf example from dukes page. Unzip to the files to directories.
2. Compile the example using the command 'asm5900 example.asm'. This will create a file called example.elf in the same directory.
3. Create a CD ISO image with
   example.elf
   system.cnf (contents described in patcher)
4. Use CD Patcher to patch ISO image.
5. Burn CD Image.
6. Use AR2 swap technique to run.