Plug compatible: Difference between revisions

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The term PCM was originally applied to manufacturers who made replacements for [[IBM]] peripherals and later IBM mainframes.
The first example of a plug compatible IBM subsystems were tape drives and controls offered by [[Telex_Communications|Telex]] beginning 1965.<ref name=Pugh"> {{cite book
| author=Pugh et al
| title=IBM's 360 and Early 370 Systems