I've been working on some different projects for a while and just forgot to give some links to the projects I made with the help of this forum.

You can find two examples of simple (hopefully not too simple) software SPI (one-way) communication in BASIC language only:

http://home.citycable.ch/flotulopex/...D_Frames_e.htm

http://home.citycable.ch/flotulopex/...D_Frames_e.htm