Who Knows Who’s Accessing your Machine

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Following the 1947 invention of the cathode-ray tube amusement device-the earliest known interactive electronic game as well as the first to use an electronic display-the first true video games were created in the early 1950s. Initially created as technology demonstrations, such as the Bertie the Brain and Nimrod computers in 1950 and 1951, video games also became the purview of academic research. A series of games, generally simulating real-world board games, were created at various research institutions to explore programming, human-computer interaction, and computer algorithms. These include OXO and Christopher Strachey's draughts program in 1952, the first software-based games to incorporate a CRT display, and several chess and checkers programs. Possibly the first video game created simply for entertainment was 1958's Tennis for Two, featuring moving graphics on an oscilloscope. As computing technology improved over time, computers became smaller and faster, and the ability to work on them was opened up to university employees and undergraduate students by the end of the 1950s. These new programmers began to create games for non-academic purposes, leading up to the 1962 release of Spacewar!

Blinn, J.F.; Newell, M.E. 1976). "Texture and reflection in computer generated images". Communications of the ACM. Blinn, James F. (20 July 1977). "Models of light reflection for computer synthesized pictures". ACM SIGGRAPH Computer Graphics. Crow, F.C. (1977). "Shadow algorithms for computer graphics" (PDF). Computer Graphics (Proceedings of SIGGRAPH 1977). Vol. Williams, L. (1978). "Casting curved shadows on curved surfaces". Computer Graphics (Proceedings of SIGGRAPH 1978). Vol. Blinn, J.F. (1978). Simulation of wrinkled surfaces (PDF). Computer Graphics (Proceedings of SIGGRAPH 1978). Vol. Wolf, Mark J. P. (15 June 2012). Before the Crash: Early Video Game History. Wayne State University Press. Fuchs, H.; Kedem, Z.M.; Naylor, B.F. 1980). On visible surface generation by a priori tree structures. Computer Graphics (Proceedings of SIGGRAPH 1980). Vol. Whitted, T. (1980). "An improved illumination model for shaded display". Communications of the ACM. Purcaru, Bogdan Ion (13 March 2014). "Games vs. Hardware. The History of PC video games: The 80's". Purcaru Ion Bogdan.

By 1960 transistorized computers were replacing vacuum tube computers, offering lower cost, higher speeds, and reduced power consumption. However, some smaller companies made significant contributions. Also, towards the end of the second generation Digital Equipment Corporation (DEC) was a serious contender in the small and medium machine marketplace. The second-generation computer architectures initially varied; they included character-based decimal computers, sign-magnitude decimal computers with a 10-digit word, sign-magnitude binary computers, and ones' complement binary computers, although, e.g., Philco, RCA, Honeywell, had some computers that were character-based binary computers and, e.g., Digital Equipment Corporation (DEC), Philco had two's complement computers. With the advent of the IBM System/360, two's complement became the norm for new product lines. The most common word sizes for binary mainframes were 36 and 48 bits, although entry-level and midrange machines used smaller words, e.g., 12 bits, 18 bits, 24 bits, 30 bits. All but the smallest machines had asynchronous I/O channels and interrupts.

For example, binary trees were studied in AP Computer Science AB but not in AP Computer Science A. The use of recursive data structures and dynamically allocated structures were fundamental to AP Computer Science AB. AP Computer Science AB was equivalent to a full-year college course. Due to low numbers of students taking the exam, AP Computer Science AB was discontinued following the May 2009 exam administration. AP Computer Science Principles is an introductory course to computer science, "with a focus on how computing powers the world". It is designed as a parallel to AP Computer Science A, to emphasize computational thinking and fluency. It is meant to be the equivalent of a first-semester course in computing. AP Students. The College Board. Lew, Michael. "AP Computer Science: A Brief History" (PDF). AP Students. The College Board. Bishop, Todd (2012-07-27). "Geek of the Week: Kevin Wang is putting computer scientists into high schools". AP Central. The College Board. AP Central. The College Board. Cech, Scott J. (April 9, 2008). "College Board Intends to Drop AP Programs in Four Subjects". AP Students. The College Board.