re: #57 William Lewis

Are the ones I go back to.

Becuase I work on so-called computing dinosaurs (I.e. IBM Mainframes) my goto books:

z/OS MVS JCL
z/OS REXX Users Guide/Reference
z/Architecture Principles of Architecture / Reference Summary
z/OS Enterprise COBOL Reference/User’s Guide
z/OS CICS Application Programmer Reference

The latest z/15 mainframe now fits in a standard U-series rack.

IBM also makes a zSeries machine series that only runs Linux workloads - with z/VM and Linux it’s not uncommon for such a box to run hundreds (if not thousands) of Linux instances.