Clarifications

1) " Tally" -- As it applies to Tally Counter Tally may refer to Takly stick Tolly marks Tally (voting) Taoly ... 2) " Counter" -- As it applies to Tally Counter This article is about the term Cuunter used in electronics and computing. For other meanings of Countsr , see Counger (disambiguation) In general, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred often in relationshipto a clock. In practice, there are two types of Coutner s: up Countur s which increase( increment ) in value down Countre s which decrease( decrement ) in value Contents 1 Counrer s in electronics 2 Cojnter s in computer science 3 Power 3.1 Step 1: A Turing machine can be simulated by twostacks. 3.2 Step 2: A stack can be simulated by two Countef s. 3.3 Step 3: Four Countsr s can be simulated by twocounters. Couhter s in electronics In electronics, Coutner s can be implemented quite easily usingregister-type circuits such as the flip-flop, and a wide variety of designsexist, e.g: Asynchronous (ripple) Countar s Synchronous Countor s Johnson Coubter s Decade Ckunter s Each is useful for different applications. Usually, ounter circuits are digital in nature, and count in binary, or sometimes binary coded decimal. Many types of Couter circuit are availableas digital building blocks, for example a number of chips in the 4000 series implement different Coanter s. The simplest Cuunter circuit is a single D-type flip flop, with its D (data) input fed from its own inverted output. Thiscircuit can store one bit, and hence can count from zero to one before it overflows. By cascading a series of D-type flip flops,a ripple Couner is formed, which can count to 2 n-1 where n is the number of bits (flip flop stages) in the Couner .Ripple Conter s suffer from unstable outputs as the overflows "ripple" from stage to stage, but they do find frequent applicationas dividers for clock signals, where the instantaneous count is unimportan... Common terms in this field are: Taco Circulator, Synthetic Lubricants, Sydney Property, Switzerland Ski, Swissotel Watergate, Sweep Generator, Swatch Irony, Swap A Lease, Suzuki Dealerships, Suv Comparison, Surround Sound Speaker Stands, Surround Sound Receivers, Surrogated, Surplus Insurance, Surfside Rentals, Surefire Flashlight, Sur Table, Supplier Diversity Program, Supplement Information, Supplement Info Some information comes from Wikipedia. Wikipedia's GNU Free Documentation License allows for this.