computer does (4). In 1930 American scientist Vannevar Bush built a mechanically operated device, called a differential analyzer (4). It was the first general-purpose analog computer. Analog computers will be discussed later in this paper. The first information-processing digital computer actually built was the Automatic Sequence Controlled Calculator, or Mark I computer (4). Completed in 1944, this electromechanical device was designed by American engineer Howard Aiken (5). In 1946 the Electronic Numerical Integrator and Computer, or ENIAC, was put into operation (5). Using thousands of electron tubes, it was the first electronic digital computer. In the late 1950s transistors replaced electron tubes in computers, allowing a reduction in the size and power consumption of computer components (5). In the 1960s hybrid computers were tried that connected analog computers to digital ones. Later integrated circuits were developed that allowed further reduction in component size and increase in reliability. The introduction of a relatively easy to use PC in 1981 began a period in the rapid growth of the computer industry. The computer industry is still thriving today with the introduction of faster processors such as the Pentium II and now the Pentium III, high tech printers, scanners, and of course the Internet. There are two types of computers, analog and digital. An analog computer is designed to process data in which the variable quantities vary continuously; it translates the relationships between the variables of a problem into analogo

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