Hardware requirements

High Level Assembler, and its generated object programs, can run in any IBM Z processor supported by the operating systems listed in the Software requirements. However, you can only run a generated object program that uses 370-XA machine instructions on a 370-XA mode processor under an operating system that provides the necessary architecture support for the 370-XA instructions used. Similarly, you can only run a generated object program that uses ESA/370, ESA/390, zSeries, or zEnterprise® machine instructions on an associated processor under an operating system that provides the necessary architecture support for the ESA/370, ESA/390, zSeries, and zEnterprise instructions used.