Dreamcast 101
Here are some must have knowledge you need to have before you start Dreamcast programming.
The library behind most of the DC homebrew scene is KallistiOS(KOS). In order to get anything running on the DC, we'll need to compile KOS and link it to your code.
The included makefile in the 02 folder will do this for you.
KOS works both with C and C++. I'm more versed in C, so this is what I'll use for the tutorials. This being said, if you know how to work with C++, you could adapt those example pretty easily.
Also, I've been successfully working with LUA within my C code. I might include a LUA-C example later.
There are many way to test your code. The easiest is to run it in a emulator, this being said, you might run into some strange behaviors once you get your code running on console. There is a makeCD.sh script included that will transform your programs into .CDI. These .CDI will work wonderfully with redream or lxdream but won't work if you burn them. More on that later.
There will also be a tutorial to get your code on your machine using DC-IP-LOAD