CPU ID fields

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The CPU identification number, with the version code and the machine type, permits a unique CPU ID for each logical partition.

The version code for the system is always zero and is not affected by the operating mode.
The CPU identification number for each logical core (see Figure 2 ) consists of a two-digit LP identifier, and digits derived from the serial number of the CPC.
- The logical partition identifier is specified using the Partition identifier field on the General page in either the reset or image profile used by the LP and must be unique for each active LP in the configuration.
The following machine types (CPC model numbers) are returned as indicated:
Table 1. Machine types and models

Machine type Models

9175 IBM z17 (Models ME1 and ML1)

9176 IBM z17 (Models ME2 and MER)

Table 1. Machine types and models
Machine type	Models
9175	IBM z17 (Models ME1 and ML1)
9176	IBM z17 (Models ME2 and MER)

Note: STIDP is provided for purposes of compatibility with earlier version. It is recommended that you use the Store System Information instruction (STSI), rather than STIDP. STSI is the preferred means to obtain all CPU information including machine serial number. When a unique logical CPU address is all that is required, use the Store CPU Address (STAP) instruction.