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|url=http://ed-thelen.org/comp-hist/IBM-ProdAnn/360-20.pdf
|title=360-20}}</ref><ref>A22-6810, p. 13</ref><ref>{{cite web |website=BitSavers
|url=
|title=IBM Confidential Field Engineering Manual of Instruction}}</ref> Since all I/O is performed by the processor, the system is particularly suited to controlling timing-dependent devices such as the 2560, where a card can be read, punched into, printed on, and sent to a specified output stacker with tight timing requirements if full rated speed is to be maintained.
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