Editing BESM (section)

===BESM-1===
''BESM-1'', originally referred to as simply the BESM or BESM AN ("BESM Akademii Nauk", BESM of the Academy of Sciences), was completed in 1952.<ref>{{cite book|last1=Metropolis|first1=Nicholas|title=History of Computing in the Twentieth Century|date=2014|publisher=Elsevier|isbn=978-1-4832-9668-5|page=149|url=https://books.google.com/books?id=AsvSBQAAQBAJ&q=%22BESM%22+1952&pg=PA149|language=en}}</ref><ref>{{cite book|last1=Impagliazzo|first1=John|last2=Proydakov|first2=Eduard|title=Perspectives on Soviet and Russian Computing: First IFIP WG 9.7 Conference, SoRuCom 2006, Petrozavodsk, Russia, July 3-7, 2006, Revised Selected Papers|date=2011|publisher=Springer|isbn=978-3-642-22816-2|page=14|url=https://books.google.com/books?id=-jSqCAAAQBAJ&q=BESM+1952&pg=PA14|language=en}}</ref> Only one BESM-1 machine was built. The machine used approximately 5,000 [[vacuum tube]]s. At the time of completion, it was the fastest computer in Europe. The [[floating-point number]]s were represented as 39-bit [[Word (computer architecture)|word]]s: 32 bits for the [[Significand|mantissa]], one bit for sign, and 1 + 5 bits for the exponent. It was capable of representing numbers in the range 10<sup>&minus;9</sup> – 10<sup>10</sup>. BESM-1 had 1024 words of [[read–write memory]] using [[core memory|ferrite core]]s, and 1024 words of [[read-only memory]] based on semiconducting diodes. It also had external storage: four [[magnetic tape]] units of 30,000 words each, and fast [[Drum memory|magnetic drum]] storage with a capacity of 5120 words and an access rate of 800 words/second. The computer was capable of performing 8–10 [[SI prefix|K]] [[Flops]]. The energy consumption was approximately 30 [[kW]], not accounting for the cooling systems.