I remember this 'scene' was very exciting. Pre-Internet you had to be in the in-crowd (of nerds) on bulletin boards, or at a meet up to ever find out. It felt l

I remember this 'scene' was very exciting. Pre-Internet you had to be in the in-crowd (of nerds) on bulletin boards, or at a meet up to ever find out. It felt like a free upgrade to your processor! here's another that's quite good: http://z80.info/zip/z80-documented.pdf http://z80.info/zip/z80-documented.pdf