I vaguely remember having read here about 'clever code' which took into account the time a magnetic drum needed to rotate in order to optimise access.

Similarly I can imagine that with resource restraints you sometimes need to be clever in order to get your program to fit. Of course, any such cleverness needs extra documentation.

I only ever programmed in user space but even then without lots of comment in my code I may already start wondering what I did after only a few months past.

Cheers,

uncle rubl