z/Architecture CMS ships as a sample program with z/VM V5.3 with no formal support available.

This version of CMS runs in z/Architecture 31-bit addressing mode and enables the use of z/Architecture instructions, including those that operate on 64-bit registers, by CMS programs, while permitting most existing ESA/390-architecture CMS programs to continue to function without change. z/Architecture CMS does not exploit or explicitly support 64-bit addressing mode but it does not impose serious restrictions on programs that enter 64-bit addressing mode themselves.

Further details and usage restrictions are described in this z/Architecture CMS document .

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