Some have expressed the interest for simple modes for the Bitbox. An recent commit is providing such mode , on top of the standard kernel.
The so-called simple modes are called like this because they provide a frame buffer interface, so the application programmer will only have to write bits and bytes to the video memory - much like it's done on PC. So the interface is a vram buch of memory and a color palette (because the tradeoff is a reduced palette or resolution)
There are two examples in the bitbox SDK (one of them below), but generally you'll need to define a simple makefile variable VGA_SIMPLE_MODE=X with the given mode and include the bitbox.mk standard makefile.
(Yes it's currently defined at compile time - if your program needs to switch between two modes at runtime, it might be time to switch to a standard kernel / engine - it's not difficult !)