IBM Mainframe computers are large-scale, multi-user computing systems capable of performing up to 856,000 Million Instructions Per Second (as of IBM z15). Renowned for their reliability, compatibility, scalability, serviceability, and security, they are ideal for mission-critical applications and enterprise-level computing tasks. Mainframe Computers are used for online transaction processing, tax processing, census data, social security systems, law enforcement databases, patient record management, billing systems, medical research, inventory management, call routing, order processing, supply chain management, reservation systems, simulation modeling, data processing, and data analytics.

We are a collective of IBM alumni and active IBM mainframe professionals who have united to provide software support for fellow mainframers globally. Since 2000, IBM Mainframes.com has been a central hub for MVS programmers, addressing issues from the Y2K era onward. Our team of seasoned professionals offers a broad spectrum of programming support, leveraging expertise from the original creators of IBM DFSORT, SYNCSORT, CA-7, Control-M, Abend Assist, and more. We provide unbiased guidance to and from community members on programming queries spanning COBOL, JCL, CICS, DB2, TSO, ISPF, REXX, IMS, IDMS, PL/I, JAVA and more.

If you are new to IBM Mainframe computers, please start your journey here: Mainframe Basics.

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IBM Mainframes.com provides technical support not only for IBM products but also for CA, Compuware, ASG, Software AG, Serena, BMC and other open source products too.