z/OS Library https://www-40.ibm.com/servers/resourcelink/svc00100.nsf/pages/zosInternetLibrary?OpenDocument https://www-40.ibm.com/servers/resourcelink/svc0010

z/OS Library https://www-40.ibm.com/servers/resourcelink/svc00100.nsf/pages/zosInternetLibrary?OpenDocument https://www-40.ibm.com/servers/resourcelink/svc00100.nsf/pag... There's also a z/VM library. You can fill a large room with the printed manuals. When I was working on the mainframe, I usually had about 20' of shelves for the manuals I used. The trick is knowing where to look in which manual. I characterised my job as being a professional [IBM] manual reader. There was a gazillion times a programmer came to me with a question and I pulled out a manual. Source code was also available for many pieces. I made several modifications and patches.