In fact it's hardly surprising that plans for downloading it onto the Speccy were received with, erm, mirth to say the very least. I must admit that I myself thought something along the lines of "R-Type? Oh yeah?" Well, Spec-chums - let me tell you something: I've never been more wrong.
Source: wiktionary
I don't *know* for sure, but I *believe* that hardware pseudo-random bit sequences like this one are often done using shift registers with feedback. Cue some more clued-up Spec-chum who can fill in the gory details...
Source: wiktionary
YS3 is the essential read for the discerning Spec-chum. Available now, you can either browse online, or download a copy to read at your leisure.
Source: wiktionary