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==History==
===Early examples===
The ACE computer, designed by [[Alan Turing]] in 1946, used microprogramming.<ref>https://books.google.co.uk/books?id=5LMVSFNhFI0C&pg=PA121&dq=ace+microprogramming&hl=en&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwirqPnOgPSOAxWRUUEAHT9KAkAQ6AF6BAgNEAM#v=onepage&q=ace%20microprogramming&f=false {{Bare URL inline|date=August 2025}}</ref>
In 1947, the design of the [[Whirlwind (computer)|MIT Whirlwind]] introduced the concept of a control store as a way to simplify computer design and move beyond ''[[ad hoc]]'' methods. The control store is a [[diode matrix]]: a two-dimensional lattice, where one dimension accepts "control time pulses" from the CPU's internal clock, and the other connects to control signals on gates and other circuits. A "pulse distributor" takes the pulses generated by the [[CPU clock]] and breaks them up into eight separate time pulses, each of which activates a different row of the lattice. When the row is activated, it activates the control signals connected to it.<ref>{{Cite tech report |last1=Everett |first1=R.R. |last2=Swain |first2=F.E. |year=1947 |title=Whirlwind I Computer Block Diagrams |publisher=MIT Servomechanisms Laboratory |id=R-127 |url=http://www.cryptosmith.com/wp-content/uploads/2009/05/whirlwindr-127.pdf |access-date=June 21, 2006 |url-status=dead |archive-url=https://web.archive.org/web/20120617112919/http://www.cryptosmith.com/wp-content/uploads/2009/05/whirlwindr-127.pdf |archive-date=June 17, 2012}}</ref>
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