Master the Mainframe & COBOL Programming

MainframeMaster publishes free tutorials for COBOL, JCL, CICS, DB2, VSAM, IBM MQ, DFSORT, Easytrieve, and TSO/ISPF. Learn the skills that still run banking, insurance, and government systems.

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mainframe-terminal

$ connecting to mainframe...

$ connection established

$ loading COBOL environment...

$ environment ready

$ initializing tutorial sequence...

$ welcome to Mainframe & COBOL Tutorials

$ type 'help' to begin

What MainframeMaster covers

MainframeMaster is a free learning site for people who need practical COBOL and mainframe skills. Tutorials walk through syntax, JCL, CICS transactions, DB2 SQL on z/OS, VSAM file access, IBM MQ messaging, DFSORT, Easytrieve, and TSO/ISPF with examples written for beginners and career changers.

Start at the tutorials index, jump into What is COBOL, or open llms.txt if you are an AI agent looking for a curated map of pages. Trust and contact details live on About, Contact, and Privacy.

Master Mainframe & COBOL

Comprehensive tutorials and resources to help you become proficient in mainframe technologies and COBOL programming.

COBOL Fundamentals

Learn the basics of COBOL programming language and its applications in enterprise systems.

Our comprehensive COBOL tutorials cover everything from basic syntax to advanced techniques used in modern mainframe environments.

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Mainframe Architecture

Understand the architecture and components of modern mainframe systems.

Explore the inner workings of mainframe systems, including hardware components, operating systems, and middleware.

DB2 & Data Management

Master database operations and data management on mainframe systems.

Learn how to work with DB2, VSAM, and other data storage technologies commonly used in mainframe environments.

Why Learn Mainframe Technologies?

Despite being developed decades ago, mainframe systems and COBOL continue to power critical infrastructure in banking, insurance, government, and more.

High Demand Skills
As experienced mainframe professionals retire, organizations are actively seeking new talent.
Competitive Salaries
Mainframe specialists often command higher salaries due to the specialized nature of their skills.
Critical Systems
Work on systems that process billions of transactions daily and support essential services worldwide.

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IDENTIFICATION DIVISION.PROGRAM-ID. HELLO-WORLD.

ENVIRONMENT DIVISION.

DATA DIVISION.
WORKING-STORAGE SECTION.
   01 WS-MESSAGE PIC X(15) VALUE 'HELLO, WORLD!'.

PROCEDURE DIVISION.
   DISPLAY WS-MESSAGE.
   STOP RUN.