z/OS V1R7.0-V1R12.0 MVS Device Validation Support
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UIM Processing

z/OS V1R7.0-V1R12.0 MVS Device Validation Support
SA22-7586-01

Overview

This chapter describes the types of requests that a UIM processes:

  • Initialization
  • Validate device parameter
  • Validate device feature
  • Validate device number
  • Validate device unit address
  • Build Device Feature Tables
  • End of data processing

An HCD unit information module (UIM) is a program (within the respective device support code) that contains information related to the I/O unit. This information is used when validating the I/O unit. Each UIM recognizes and processes the values coded for its I/O unit in the I/O configuration. Not all UIMs support single I/O units; a UIM may define a grouping of several related I/O units.

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