AS400 Learning Center

AS400 Support

AS400 support can mean IBM i operating system support, IBM Power hardware support, application support, or daily administration support. The right answer depends on the release, the machine model, and the software stack around the workload.

AS400 support is not one service. It can mean support for the IBM i operating system, support for IBM Power hardware, support for RPG or COBOL applications, support for a 5250 user environment, or support from an IBM Business Partner that understands the older AS400 vocabulary. The first step is to identify which layer is actually in trouble.

What AS400 Support Can Mean

Most AS400 support questions fall into five groups:

  • Operating system support: IBM i release level, PTFs, security fixes, and software maintenance coverage
  • Hardware support: machine type, model, serial number, parts availability, HMC, adapters, disk, and warranty or maintenance status
  • Application support: RPG, COBOL, CL, database files, ERP packages, custom code, and vendor applications
  • Administration support: user profiles, backups, job queues, subsystems, printer output, 5250 access, and daily operations
  • Modernization support: APIs, web access, reporting, security review, HA or DR design, and upgrade planning

Using the phrase AS400 is normal in search and conversation, but contracts and technical documentation usually use IBM i for the operating system and IBM Power Systems for the hardware.

Original AS400 Hardware vs Modern IBM i Support

The original AS/400 hardware family is a legacy platform from the late 1980s and 1990s. Modern support conversations usually involve IBM i running on newer IBM Power Systems hardware, not an original AS/400 cabinet. If a machine is still physically old AS/400, iSeries, or System i hardware, the practical support question becomes parts, risk, backup strategy, and migration path.

If the environment runs current IBM i on supported IBM Power hardware, support is more structured. IBM's own release life cycle page lists IBM i release dates, change-in-service dates, and extension availability. For hardware compatibility, IBM's platform support details page explains which IBM i levels support specific Power server generations.

What to Gather Before Asking for Support

A useful support conversation starts with evidence. Gather the IBM i release, cumulative PTF level, machine type and model, serial number, processor group, memory, disk or SAN layout, backup method, high availability setup, and the names of any major application packages. For application support, also identify the language stack, database files, job names, subsystem names, and whether the problem is reproducible.

For hardware or upgrade help, the machine type and model matter as much as the AS400 label. The same AS400 support request may point to a Power 9, Power 10, or Power 11 refresh if the system is old enough or the IBM i release is boxed in by hardware limits.

When Support Becomes an Upgrade Question

Support work turns into upgrade planning when the current release can no longer receive normal fixes, when hardware parts are difficult to source, when the business cannot test backups confidently, or when application vendors stop certifying the older environment. In those cases, keeping the system alive is not the same as keeping it healthy.

For release-specific support status, read IBM i Support Status. For lifecycle wording that matches older search behavior, read AS400 End of Life. If the next step is hardware sizing, use IBM Power Sizing Basics.

Frequently Asked Questions

Is AS400 still supported?
The original AS/400 hardware line is legacy hardware. The modern platform, IBM i running on supported IBM Power Systems hardware, is still supported when the IBM i release, hardware generation, and software maintenance coverage are current.
Is AS400 support the same as IBM i support?
In casual conversation, often yes. In precise support terms, IBM i support refers to the operating system, IBM Power support refers to the server hardware, and AS400 is the legacy umbrella term many teams still use.
Who provides AS400 support today?
Support can come from IBM, an IBM Business Partner, a managed service provider, an internal IBM i administrator, or a software vendor. The right source depends on whether the issue is OS, hardware, application, database, security, or daily operations.
Can old AS400 applications still be supported?
Yes, many RPG, COBOL, and CL applications are still supported and maintained. The risk depends on documentation, source availability, developer knowledge, IBM i release level, vendor status, and whether the surrounding hardware remains supportable.