You should be knowledgeable enough to make good decisions. In multiprocessing, several CPUs are installed in the same machine, processing data in parallel. The description of the computer, input devices, output devices, internal memory and external storage devices is self-explanatory. E-mail me with any questions if you are unclear about anything. Computer classifications are changing rapidly.
Students often confuse external memory size and RAM size .
You should understand the difference and the importance of each type of memory for different business purposes. External memory refers to permanent storage. Your hard drive, a floppy disk, magnetic tapes, etc. are all examples of external memory. RAM on the other hand is volatile. If you lose power before a document is saved to an external storage device, the document is lost.