In the world of computers, some terms are sometimes used in a surprising way, such as the expression “Personal Computer”. For example, the IBM 610 Auto-Point computer (from 1957) was described as “the first IBM personal computer” because it was designed to be operated by only one operator, but this machine was not based on the concept of program memory and it cost $ 55,000! Other candidates are LINC computers from MIT (1963), Datapoint 2200 from CTC (1971), Kenbak-1 (1971) and Xerox Alto (1973), but all of these machines were either incredibly expensive, relatively useless, or were only experimental designs .