IBM System/370

The IBM System/370 (S/370) was a model range of IBM mainframes announced on June 30, 1970 as the successors to the System/360 family. The series maintained backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement. Improvements over the S/360 first released in the S/370 model range included:

  • standard dual-processor capability;
  • "monolithic main memory" based on integrated circuits instead of magnetic cores;
  • full support for virtual memory through a new microcode floppy disk on the 370/145 and a hardware upgrade to include a DAT box on the 370/155 and 370/165; these were not announced until 1972;
  • 128-bit floating point arithmetic on all models.

Read more about IBM System/370:  Evolution, Expanding The Address Space, Series and Models, S/370 Replacement, Linux On The S/370, I/O Evolutions, Architecture Details

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