Online Reservation for Catering Services Essay

The Apple II became an arcminute success when released in 1977 with its printed circuit motherboard, switching power supply, keyboard, case assembly, manual, game paddles, A/C powercord, and cassette enter with the computer game Breakout. When hooked up to a color television set, the Apple II produced superb color graphics.The Kenbak-1, the first personal computer, advertised for $750 in Scientific American. Designed by John V. Blankenbaker utilise standard medium-scale and small-scale integrated circuits, the Kenbak-1 relied on switches for input and lights for output from its 256-byte memory. In 1973, after selling only when 40 machines, Kenbak Corp. closed its doors.The Commodore PET (Personal Electronic Transactor) the first of several personal computers released in 1977 came fully assembled and was unbiased to operate, with either 4 or 8 kilobytes of memory, two built-in cassette drives, and a membrane chiclet keyboard.The abacus was an early assist for mathematical com putations. Its only value is that it aids the memory of the human performing the calculation. A skilled abacus actor can work on addition and subtraction problems at the speed of a person weaponed with a hand calculator (multiplication and division are slower). The abacus is often wrongly attributed to China. In fact, the oldest surviving abacus was employ in 300 B.C. by the Babylonians. The abacus is still in use today, principally in the far east. A modern abacus consists of rings that slide over rods, but the older one pictured below dates from the condemnation when pebbles were used for counting (the word calculus comes from the Latin word for pebble).