Only computers with sound cards have the mike input - but that's pretty much any computer nowadays. On the sound card, there are usually 2 or 3 1/8" phono jacks, and a joystick (15 pin) port. The jacks are normally labeled something along the lines of "in", "out", and "mike", or have pictures that represent line in, line out, and microphone. It's hard to be more specfic than that because manufacturers vary so much on how they label.