Multiple Sclerosis: Causes, Symptoms and Treatments. Multiple sclerosis, also known as MS, is a chronic disease that attacks the central nervous system, i.e. the brain, spinal cord and optic nerves. In severe cases, the patient becomes paralyzed or blind while in milder cases there may be numbness in the limbs. Over 350,000 people have MS in the US.
Devices you think of as input-only, such as a keyboard, might also be an output device (keyboard status LEDs). Conversely, devices you think of as output-only might also serve as input devices (paper/toner/ink status messages back to the computer).
Input and Output Devices : Links to topics on this page: Before a computer can process your data, you need some method to input the data into the machine. The device you use will depend on what form this data takes (be it text, sound, artwork, etc.).