just to be clear, that link I posted tells about a digital scope, not a logic analyzer.
@cr0sh, thanks ! I need such a sampler for another purpose, and after I did the math it seems is is even too fast for me. so I can probably loop and avoid the asm stuff.
One beginners question : is there a read operation which reads a whole port (8 pins) in sketch ? ReadByte() or something ? it is imperative I read all 8 (or 4) bits at the exact same time.