Here are some useful links I found on the IBM BookManager® BookServer Library site. Searches can be done for COBOL, Data Formats, etc. I hope this information is useful.
Ted Seward
Online Documentation (for keyword searches, for example use COBOL
as a keyword):
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/LIBRARY
ESA/390 Principles of Operation:
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DZ9AR004/CCONTENTS
Decimal Instructions: Includes description
of the data formats for decimal / packed decimal data:
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DZ9AR004/8%2e1
Floating Instructions: Includes description
of the data formats
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DZ9AR004/9%2e1
EBCDIC / ASCII Translate Table
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DZ9AR004/I%2e0
Using Data Sets (VSAM, ISAM, Sequential)
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DGT1D404/CCONTENTS
Record Formats (Fixed, Variable, tapes, etc.)
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/DGT1D404/3%2e2
Glossary of Terms:
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/EZEGLS00/CCONTENTS
Actually glossary starts in chapter 2:
http://www.s390.ibm.com:80/bookmgr-cgi/bookmgr.cmd/BOOKS/EZEGLS00/2%2e0