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As of 1967 the following [[peripheral]]s were supported:<ref name=FuncChar />{{rp|pp.36–110}}
*[[IBM 2415]] Magnetic Tape Unit with up to 6 [[Magnetic tape data storage|tape drives]].
*[[#IBM 2560 Multi-Function Card Machine|IBM 2560]] Multi-Function Card Machine.
*[[IBM 2520]] Card Read/Punch or Card Punch.
*[[IBM 1419]] Magnetic Ink Character Reader.
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Model 20 disk storage uses [[History of IBM magnetic disk drives#IBM 2311|IBM 2311 disk drives]], model 11 or 12, attached to an integrated "storage control feature" on the CPU.<ref name=FuncChar />{{rp|pp.58–76}} If multiple drives are attached they have to be the same model. Both models use the 1316 [[disk pack]] which provides a maximum of 203 [[Cylinder (disk drive)|cylinders]] with 10 [[Track (disk drive)|tracks]] per cylinder. The model 11 uses all cylinders, the model 12 uses only the outermost 103. Each track is divided into ten [[Disk sector|sector]]s of 270 bytes each. The model 11 has a formatted capacity of 5.4 million bytes, and the model 12 of 2.5 million.<ref>[http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/ibm/dasd/2311/Y26-5897-4_2311_FE_Theory_Of_Operation_Oct67.pdf “IBM 2311 Disk Storage Drive Models 1, 11 and 12 Field Engineering Theory of Operation”] describes the IBM 2311, including models 11 and 12, used on System/360 model 20</ref>
===IBM 2560 Multi-Function Card Machine===
A peripheral first offered on the Model 20 is the '''IBM 2560 Multi-Function Card Machine''' (MFCM). Because of its reliability problems, often involving card jams, the acronym was frequently interpreted as referring to many less favorable names.
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