God how much I time I spent on my computer programming with this in secondary school. Didnt have the any reference book, just some months of a basic computer course and a low level 8088 cpu computer. But i LOVED my time. I plotted polar coordinates, did a basic aswd based drawing program which could save and load pictures, tried some gaming but didnt have the notion of threads so my shoot em bullets would stop the world :)).

Still have the same joy :).