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IBM 2365 Processor Storage
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<p>The IBM 2365 Processor Storage is a <a href="/facts/Magnetic-core_memory/4TFIXSNd">magnetic-core memory</a> storage unit that is a component of the <a href="/facts/IBM_System/360/7znvpy4K">IBM System/360</a> models <a href="/facts/IBM_System/360_Model_65/Clz78CuQ">65</a>, <a href="/facts/IBM_System/360_Model_67/0BwJAwRV">67</a>, <a href="/facts/IBM_System/360_Model_75/znW7kURJ">75</a> and <a href="/facts/IBM_System/360_Model_85/pVoUUagB">85</a> computers, which were released between 1965 and 1968. </p><p>Storage is implemented using magnetic cores with a storage width of 72 <a href="/facts/Bit/S972NSaD">bits</a>, which comprise 64 data bits (8 <a href="/facts/Bytes/BNHUp9Qq">bytes</a>, or one doubleword) plus 8 parity bits. The IBM 2365 model 1 contains 131,072 (128 K) bytes of memory; all other models contain 262,144 (256 K) bytes. The model 2 could be converted in the field to a model 13. </p><p>All models other than the model 1 consist of two memory stacks. Addressing for the stacks is <a href="/facts/Interleaved_memory/UPt7yxW9">interleaved</a>, so the first 64-bit word is in one stack, the second in the other stack, and so forth. This improves performance when doing sequential access. </p><p>All models other than the model 5 have a cycle time of 750 <a href="/facts/Nanoseconds/gARLTp4c">nanoseconds</a>. </p>