Sometime Today, Debarshi Ray assembled some asciibets to say:
I had bought it only to learn about DOS routines for the mouse. Interrupt 33h I think
There are other places where you can learn about interrupt 0x33, 8-bit colors, playing WAVs and displaying BMPs in TurboC, etc.. One of them is the Internet.
the pc game programmer's encyclopaedia (pcgpe for short) is one such resource. That's where I learnt a lot of my programming from.