The Supervisor Diagnosis Reference Manual (DRM) for z/VSE 5.2 is now available for download from our documentation page.
The DRM consists of two parts the the Diagnosis Reference itself and the information about Supervisor Calls and Internal Macros.
The Diagnosis Reference describes the z/VSE architecture, Supervisor components such as the turbo dispatcher, page manager, I/O Supervisor, and
most important system functions. It also includes details about the Supervisor debug facility.

You can find both books here.