I have listed below some very useful links for Mainframe programming
IBM Mainframe Manuals for VS COBOL II, IBM COBOL, Enterprise COBOL, MVS JCL, OS/390 JCL, z/OS JCL, TSO, ISPF, SDSF, DFSORT, ICETOOL, CLIST, REXX, PL/I, CICS/ESA, CICS/TS, DB2, DB2/UDB, IMS, SQL Codes, Abend Codes, ErrorCodes, System Messages, SOC errors, CICS Abends etc
Very useful REXX tutorial.
Part 1 , Part 2, Part 3
Find all IMS retun codes and their meaning here.
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