RICHARDS CONTROLLER
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Control unitThe control unit (CU) is a component of a computer's central processing unit (CPU) that directs the operation of the processor. A CU typically uses a binary decoder to convert coded instructions into timing and control signals that direct the operation of the other units (memory, arithmetic logic unit and input and output devices, etc.). Most computer resources are managed by the CU. It directs the flow of data between the CPU and the other devices. John von Neumann included the control unit as part of the von Neumann architecture. In modern computer designs, the control unit is typically an internal part of the CPU with its overall role and operation unchanged since its introduction.
Finite-state machineA finite-state machine (FSM) or finite-state automaton (FSA, plural: automata), finite automaton, or simply a state machine, is a mathematical model of computation. It is an abstract machine that can be in exactly one of a finite number of states at any given time. The FSM can change from one state to another in response to some inputs; the change from one state to another is called a transition. An FSM is defined by a list of its states, its initial state, and the inputs that trigger each transition. Finite-state machines are of two types—deterministic finite-state machines and non-deterministic finite-state machines. For any non-deterministic finite-state machine, an equivalent deterministic one can be constructed. The behavior of state machines can be observed in many devices in modern society that perform a predetermined sequence of actions depending on a sequence of events with which they are presented. Simple examples are: vending machines, which dispense products when the proper combination of coins is deposited; elevators, whose sequence of stops is determined by the floors requested by riders; traffic lights, which change sequence when cars are waiting; combination locks, which require the input of a sequence of numbers in the proper order. The finite-state machine has less computational power than some other models of computation such as the Turing machine. The computational power distinction means there are computational tasks that a Turing machine can do but an FSM cannot. This is because an FSM's memory is limited by the number of states it has. A finite-state machine has the same computational power as a Turing machine that is restricted such that its head may only perform "read" operations, and always has to move from left to right. FSMs are studied in the more general field of automata theory.
Mealy machineIn the theory of computation, a Mealy machine is a finite-state machine whose output values are determined both by its current state and the current inputs. This is in contrast to a Moore machine, whose output values are determined solely by its current state. A Mealy machine is a deterministic finite-state transducer: for each state and input, at most one transition is possible.
Scientific phenomena named after peopleThis is a list of scientific phenomena and concepts named after people (eponymous phenomena). For other lists of eponyms, see eponym.
MaestegMaesteg (English: ; Welsh: [maisˈteːɡ] ) is a town and community in Bridgend County Borough, Wales. Maesteg lies at the northernmost end of the Llynfi Valley, close to the border with Neath Port Talbot. In 2011, Maesteg had a population of 20,612. The English translation of Maesteg is 'fair field'. Maesteg officially became a town in 1826 and is celebrating it's bicentenary in 2026 with organised events and celebrations being organised by a committee of residents and local groups and businesses. Historically a part of Glamorgan, the growth of the town started with the opening of ironworks in the 1820s and 1830s. Once a coal mining area, the last pit closed in 1985. With the decline of the coal industry and, more recently, the closure of one large factory producing cosmetics and another manufacturing vehicle components, the valley has become a residential/dormitory area for the Port Talbot, Bridgend and Cardiff journey to work areas. 11% (1,867 out of 20,702) of the town's population speak Welsh with 27.9% of 3-15 year olds speaking the language. It is one of the few areas of Wales where the traditional Mari Lwyd is still celebrated during Christmas. The community of Maesteg had a population of 17,580 in the 2011 census and includes Nantyffyllon. The built-up area having a population of 21,000.
List of The Railway Series charactersStarted in 1945 and concluded in 2011, The Railway Series is a series of 42 British books written by Wilbert Awdry and his son Christopher Awdry. This is a list of all characters who appeared in the book series. Unless otherwise said on this page, the technical notes come from actual notes laid out by Awdry when he was developing the characters and setting for his stories; these notes are cited in his publication The Island of Sodor: Its People, History, and Railways.
Richards controllerThe Richards controller is a method of implementing a finite-state machine using simple integrated circuits and combinational logic. The method was named after its inventor, Charles L. Richards. It allows for easier design of complex finite-state machines than the traditional techniques of state diagrams, state-transition tables and Boolean algebra offer. Using Richards's technique, it becomes easier to implement finite-state machines with hundreds or even thousands of states. Because of the Richards controller's ability to scale to use many states easily, it can be used in many practical applications.
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