Dave Brackeen's VGA Programming in C tutorials also show off graphics modes and optimizations for things like primitive drawing, bitmaps, etc. I used this to create a game years ago
http://www.brackeen.com/vga/index.html
There also used to be a site called ProgrammersHaven (later renamed ProgrammersHeaven that seems to have dumped all of its original content). This site had a collection of random programs and source files, many of which showed off demoscene techniques (parallax, plasma, 3D, bumpmapping, etc)
Dave Brackeen's VGA Programming in C tutorials also show off graphics modes and optimizations for things like primitive drawing, bitmaps, etc. I used this to create a game years ago http://www.brackeen.com/vga/index.html
There also used to be a site called ProgrammersHaven (later renamed ProgrammersHeaven that seems to have dumped all of its original content). This site had a collection of random programs and source files, many of which showed off demoscene techniques (parallax, plasma, 3D, bumpmapping, etc)