Programmable devices have existed at least as far back as AD, when the automata of Al-Jazari were programmable, via pegs and camsto play various rhythms and drum patterns; [3] and the Jacquard loom could produce entirely different weaves by changing the "program" - a series of pasteboard cards with holes punched in them. In the s Herman Hollerith invented the concept of storing data in machine-readable form. However, with the concept of the stored-program computers introduced inboth programs and data were stored and manipulated in the same way in computer memory.

The Ishango bone Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick.

Later record keeping aids throughout the Fertile Crescent included calculi clay spheres, cones, etc.

The Roman abacus was developed from devices used in Babylonia as early as BC. Since then, many other forms of reckoning boards or tables have been invented. In a medieval European counting housea checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.

The ancient Greek -designed Antikythera mechanismdating between and BC, is the world's oldest analog computer. The Antikythera mechanism is believed to be the earliest mechanical analog "computer", according to Derek J. It was discovered in in the Antikythera wreck off the Greek island of Antikytherabetween Kythera and Creteand has been dated to c.

Devices of a level of complexity comparable to that of the Antikythera mechanism would not reappear until a thousand years the basics of writing a computer program.

Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. A combination of the planisphere and dioptrathe astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy.

An astrolabe incorporating a mechanical calendar computer [9] [10] and gear -wheels was invented by Abi Bakr of IsfahanPersia in The sectora calculating instrument used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots, was developed in the late 16th century and found application in gunnery, surveying and navigation.

The planimeter was a manual instrument to calculate the area of a closed figure by tracing over it with a mechanical linkage.

A slide rule The slide rule was invented around —, shortly after the publication of the concept of the logarithm. It is a hand-operated analog computer for doing multiplication and division.

As slide rule development progressed, added scales provided reciprocals, squares and square roots, cubes and cube roots, as well as transcendental functions such as logarithms and exponentials, circular and hyperbolic trigonometry and other functions.

Slide rules with special scales are still used for quick performance of routine calculations, such as the E6B circular slide rule used for time and distance calculations on light aircraft.

In the s, Pierre Jaquet-Droza Swiss watchmakerbuilt a mechanical doll automaton that could write holding a quill pen. By switching the number and order of its internal wheels different letters, and hence different messages, could be produced.

In effect, it could be mechanically "programmed" to read instructions. It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location. The differential analysera mechanical analog computer designed to solve differential equations by integrationused wheel-and-disc mechanisms to perform the integration.

InLord Kelvin had already discussed the possible construction of such calculators, but he had been stymied by the limited output torque of the ball-and-disk integrators.

The torque amplifier was the advance that allowed these machines to work. Starting in the s, Vannevar Bush and others developed mechanical differential analyzers. First computing device A portion of Babbage's Difference engine.

Charles Babbagean English mechanical engineer and polymathoriginated the concept of a programmable computer. Considered the " father of the computer ", [17] he conceptualized and invented the first mechanical computer in the early 19th century.

After working on his revolutionary difference enginedesigned to aid in navigational calculations, in he realized that a much more general design, an Analytical Enginewas possible. The input of programs and data was to be provided to the machine via punched cardsa method being used at the time to direct mechanical looms such as the Jacquard loom.

For output, the machine would have a printer, a curve plotter and a bell. The machine would also be able to punch numbers onto cards to be read in later. The Engine incorporated an arithmetic logic unitcontrol flow in the form of conditional branching and loopsand integrated memorymaking it the first design for a general-purpose computer that could be described in modern terms as Turing-complete.

Eventually, the project was dissolved with the decision of the British Government to cease funding.

Babbage's failure to complete the analytical engine can be chiefly attributed to difficulties not only of politics and financing, but also to his desire to develop an increasingly sophisticated computer and to move ahead faster than anyone else could follow.

Nevertheless, his son, Henry Babbage, completed a simplified version of the analytical engine's computing unit the mill in He gave a successful demonstration of its use in computing tables in Analog computers Sir William Thomson 's third tide-predicting machine design, —81 During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated analog computerswhich used a direct mechanical or electrical model of the problem as a basis for computation.

However, these were not programmable and generally lacked the versatility and accuracy of modern digital computers. The differential analysera mechanical analog computer designed to solve differential equations by integration using wheel-and-disc mechanisms, was conceptualized in by James Thomsonthe brother of the more famous Lord Kelvin.

This built on the mechanical integrators of James Thomson and the torque amplifiers invented by H. A dozen of these devices were built before their obsolescence became obvious.Digital Literacy Standard Curriculum Version 4 teaches generic ICT skills and concepts.

The curriculum features screen shots and simulations from Windows 8 and Microsoft Office to illustrate and provide hands-on examples. Before you start writing a computer program, first take four critical steps to design it.

By doing so, you don’t waste time writing a computer program that doesn’t work or that solves the wrong problem and isn’t worth trying to salvage afterward. Alice is an innovative block-based programming environment that makes it easy to create animations, build interactive narratives, or program simple games in 3D.

Since memory is linear (unlike the computer screen, which has both an x and a y dimension), the offset into computer memory must be calculated to plot a pixel.

To do this the y value is multiplied by the width of the screen, or , and the x value is added to that. Thus to plot a pixel at location (,8), first calculate +8*= or 0xB00, then write to segment 0xA, offset 0xB Basic computer information for webmasters and computer users.

Learn basic computer skills, basic internet skills, blogging and productivity software. to a newspaper article. The police report will contain information that answers the following questions: who, what, when, where, why, how.

This is based upon what the officers see, hear, smell, and experience at .

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Teaching kids how to write computer programs, by Marshall Brain