Component Names
IBM created a new naming system for the new components created for System/360, although well-known old names, like IBM 1403 and IBM 1052, were retained. In this new naming system, components were given four-digit numbers starting with 2. The second digit described the type of component, as follows:
| 20xx: | Arithmetic processors, for example the IBM 2030, which was the CPU for the IBM System/360 Model 30. |
| 21xx: | Power supplies and other equipment intimately associated with processors, for example the IBM 2167 Configuration Unit. |
| 22xx: | Visual output devices, for example the IBM 2250 and IBM 2260 CRT displays, and the IBM 2203 line printer for the System/360 model 20. |
| 23xx: | Direct-access storage devices, for example the IBM 2311 and IBM 2314 disk drives, the IBM 2321 Data Cell; Main storage such as the IBM 2361 Large Capacity Storage (Core Storage, Large Core Storage or LCS) and the IBM 2365 Processor Storage. |
| 24xx: | Magnetic tape drives, for example the IBM 2401, IBM 2405 and IBM 2415. |
| 25xx: | Punched card handling equipment, for example the IBM 2501 (card reader), IBM 2520 (card punch); IBM 2540 (reader/punch) and IBM 2560 (Multi-Function Card Machine or MFCM). |
| 26xx: | Paper tape handling equipment, for example the IBM 2671 paper tape reader. |
| 27xx: | Communications equipment, for example the IBM 2701, IBM 2705, IBM 2741 interactive terminal and the IBM 2780 batch terminal. |
| 28xx: | Channels and controllers, for example the IBM 2821 Control Unit, IBM 2841 and IBM 2844. |
| 29xx: | Miscellaneous devices, for example the IBM 2914 Data Channel Switch and the IBM 2944 Data Channel Repeater. |
Read more about this topic: IBM System/360
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