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- Harvard_Mark_II abstract "The Harvard Mark II was an electromechanical computer built at Harvard University under the direction of Howard Aiken and was finished in 1947. It was financed by the United States Navy.The Mark II was constructed with high-speed electromagnetic relays instead of electro-mechanical counters used in the Mark I, making it much faster than its predecessor. Its addition time was 0.125 seconds (8 Hz) and the multiplication time was 0.750 seconds. This was a factor of 2.6 faster for addition and a factor 8 faster for multiplication compared to the Mark I. It was the second machine (after the Bell Labs Relay Calculator) to have floating-point hardware. A unique feature of the Mark II is that it had built-in hardware for several functions such as the reciprocal, square root, logarithm, exponential, and some trigonometric functions. These took between five and twelve seconds to execute. The Mark II was not a stored-program computer – it read an instruction of the program one at a time from a tape and executed it (like the Mark I). This separation of data and instructions is known as the Harvard architecture. The Mark II had a peculiar programming method that was devised to ensure that the contents of a register were available when needed. The tape containing the program could encode only eight instructions, so what a particular instruction code meant depended on when it was executed. Each second was divided up into several periods, and a coded instruction could mean different things in different periods. An addition could be started in any of eight periods in the second, a multiplication could be started in any of four periods of the second, and a transfer of data could be started in any of twelve periods of the second. Although this system worked, it made the programming complicated, and it reduced the efficiency of the machine somewhat.The Mark II ran some realistic test programs in July 1947. It was delivered to the US Navy Proving Ground at Dahlgren, Virginia in 1947 or 1948.".
- Harvard_Mark_II wikiPageID "2202534".
- Harvard_Mark_II wikiPageRevisionID "580738931".
- Harvard_Mark_II hasPhotoCollection Harvard_Mark_II.
- Harvard_Mark_II subject Category:Electro-mechanical_computers.
- Harvard_Mark_II subject Category:Harvard_University.
- Harvard_Mark_II subject Category:One-of-a-kind_computers.
- Harvard_Mark_II type Artifact100021939.
- Harvard_Mark_II type Computer103082979.
- Harvard_Mark_II type Device103183080.
- Harvard_Mark_II type Electro-mechanicalComputers.
- Harvard_Mark_II type Instrumentality103575240.
- Harvard_Mark_II type Machine103699975.
- Harvard_Mark_II type Object100002684.
- Harvard_Mark_II type One-of-a-kindComputers.
- Harvard_Mark_II type PhysicalEntity100001930.
- Harvard_Mark_II type Whole100003553.
- Harvard_Mark_II comment "The Harvard Mark II was an electromechanical computer built at Harvard University under the direction of Howard Aiken and was finished in 1947. It was financed by the United States Navy.The Mark II was constructed with high-speed electromagnetic relays instead of electro-mechanical counters used in the Mark I, making it much faster than its predecessor. Its addition time was 0.125 seconds (8 Hz) and the multiplication time was 0.750 seconds.".
- Harvard_Mark_II label "Harvard Mark II".
- Harvard_Mark_II label "Harvard Mark II".
- Harvard_Mark_II label "Harvard Mark II".
- Harvard_Mark_II label "هارفارد مارك II".
- Harvard_Mark_II sameAs Harvard_Mark_II.
- Harvard_Mark_II sameAs Harvard_Mark_II.
- Harvard_Mark_II sameAs m.06vlpb.
- Harvard_Mark_II sameAs Q3128018.
- Harvard_Mark_II sameAs Q3128018.
- Harvard_Mark_II sameAs Harvard_Mark_II.
- Harvard_Mark_II wasDerivedFrom Harvard_Mark_II?oldid=580738931.
- Harvard_Mark_II isPrimaryTopicOf Harvard_Mark_II.