The original System/370 line was announced on June 30, 1970, with first customer shipment of the Models 155 and 165 … See more

The following table summarizes the major S/370 series and models. The second column lists the principal architecture associated with each series. Many models implemented more than one architecture; thus, 308x … See more

IBM documentation numbers the bits from high order to low order; the most significant (leftmost) bit is designated as bit number 0.
S/370 also refers to a computer system architecture specification, and is a direct and mostly … See more

IBM replaced the System/370 line with the System/390 in the 1990s, and similarly extended the architecture from ESA/370 to ESA/390. This was a minor architectural change, and was upwards compatible.
In 2000, th… See more

The GNU Compiler Collection (GCC) had a back end for S/370, but it became obsolete over time and was finally replaced with the S/390 backend. Although the S/370 and S/390 instruction sets are essentially the same (and … See more

The block multiplexer channel, previously available only on the 360/85 and 360/195, was a standard part of the architecture. For compatibility it could operate as a selector channel. Block multiplexer channels were available i… See more