Z Os Adcd 113 13 Work ((link)) -

: While modern z/OS versions require substantial overhead, a trimmed z/OS 1.13 environment can work reliably with 4 GB to 8 GB of RAM allocated specifically to the zPDT instance . Step-by-Step System Initialization (IPL)

With the system running and accessible, you can log in to TSO/E (Time Sharing Option/Extensions) to begin day-to-day development or administrative workflows. Default Credentials z os adcd 113 13 work