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IBM's original official brand spelling for the Application System/400 platform introduced in 1988. AS400 is the later slashless shorthand and search form.

A common spaced search and voice-typing version of IBM's Power10 product name. Not IBM's official styling, but widely used by searchers.

A common spaced search and voice-typing version of IBM's Power11 product name. Not IBM's official styling, but widely used by searchers.

A common spaced search and voice-typing version of IBM's Power9 product name. Not IBM's official styling, but widely typed by real users.

IBM's official no-space styling for the 2021 Power generation. Power 10 with a space is a common user-typed variant of the same product family.

IBM's official no-space styling for the 2017 Power generation. Power 9 with a space is a common search and voice-typing variant of the same hardware family.

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BigTech Reseller's IBM section helps buyers discover IBM Power resellers, IBM i solution providers, AS400 upgrade resources, storage options, and related IBM ecosystem coverage.

AS400 is a hardware brand name from 1988. IBM i is the current official name for the operating system that runs on IBM Power hardware. They are the same lineage, different names. Understanding the distinction matters for licensing, support conversations, and upgrade planning.

IBM Power11 Overview

IBM Power11 is the latest generation of IBM Power Systems hardware, released in 2024. Power11 delivers new performance gains, energy efficiency improvements, and full compatibility with IBM i workloads from AS400-era applications forward.

Is AS400 Still Used?

Yes. AS400 ... now called IBM i on IBM Power Systems ... is still actively used by thousands of organizations worldwide. IBM continues to invest in the platform with new hardware releases and OS updates.

AS400 is IBM's mid-range business computing platform introduced in 1988. Despite multiple name changes over the decades, AS400 remains the most widely used search term for IBM i, iSeries, and IBM Power systems worldwide.

What Replaced AS400?

IBM i on IBM Power Systems hardware replaced the AS400. The operating system evolved through iSeries, System i, and IBM i naming. IBM Power10 and Power11 are the current hardware generation. The workloads never disappeared ... only the brand names changed.

The slashless form of IBM's original AS/400 brand name. Not the original official styling, but now the dominant search, typing, and colloquial shorthand for IBM i and IBM Power Systems.

Commercial Processing Workload. IBM's benchmark metric for measuring the relative processing performance of IBM i systems. Used to compare AS400/IBM i hardware generations and models.

The integrated relational database built into IBM i (AS400). DB2 for i is not a separate product ... it is part of the OS. One of the AS400 platform's defining architectural advantages.

The text-based character interface used to interact with AS400 and IBM i systems. Named for the green monochrome display terminals originally used. A key modernization target.

The current official name for the operating system that runs on IBM Power Systems. Successor to OS/400 and i5/OS. The OS lineage of the AS400 platform.

IBM Power Systems

The IBM server hardware platform that runs IBM i (and AIX and Linux). The hardware successor to the AS400, iSeries, and System i platforms.

The brand name IBM used for the AS400 hardware platform from 2000 to 2006. Replaced by System i in 2006 and IBM Power Systems in 2008.

The original operating system for the AS400 platform, released in 1988. Renamed to i5/OS in 2004 and IBM i in 2008. The OS lineage that all IBM i releases trace back to.

IBM's official no-space styling for the 2024 Power generation. Brand-correct in IBM materials, while Power 11 with a space is also common in search and voice typing.

IBM's primary programming language for AS400 and IBM i. Report Program Generator, now evolved into a modern structured language (ILE RPG / RPGLE) still in active use.

IBM's brand name for the AS400/iSeries platform from 2006 to 2008. Part of IBM's unified Systems branding. Replaced by IBM Power Systems.

AS400 Basics FAQ

Answers to the most common AS400 questions from IT professionals, executives, and administrators new to the IBM i platform.

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