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IBM System/370 Model 145

The IBM System/370 Model 145 was announced September 23, 1970, three months after the 155 and 165 models. It was the fourth member of the IBM System/370 line of computers, and was the first IBM computer to use semiconductor memory for its main memory instead of magnetic core memory. It was described as being five times faster than the IBM System/360 Model 40. First shipments were scheduled for late summer of 1971.

Virtual memory
Initially, the System/370 Model 145 did not support virtual memory. Unlike the earlier Model 155 and 165 systems, for which an upgrade to virtual memory required the purchase of an expensive upgrade to add a DAT box, the Model 145 already included an associative memory used by the microcode for the DOS compatibility feature from its first shipments in June 1971; enabled virtual memory capability. Operating systems The 370/145 supported both DOS/360 and OS/360. Lacking virtual memory support, the 145, as announced, could not run a virtual memory operating system. Upon gaining virtual memory capability via a microcode update, the 145 could now support the VMF (Virtual Machine Facility) and VM/CMS, a time-sharing system. ==See also==
Source: Wikipedia ↗
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