mouse keyboard  joystick  light pen  touch pad  microphone  scanner  track ball  digital camera
• touchscreen • keyboard • scanner • barcode reader • joystick • mouse • tracker ball • touchpad • omr (optical mark recognition) • light pen (infrared text reader)
keyboard, mouse, special screens (touch, multitouch, etc.), joystick, stylus, scanning devices (optical, card readers, bar code readers, etc.), audio input, image capturing (digital cameras, video, etc.)