The AS400 and IBM i Knowledge Base for the IBM Power Era
Clear answers about AS400, IBM i, iSeries, System i, and modern IBM Power systems ... from legacy terminology to Power11 upgrade planning.
AS/400 Is Still How the World Searches for IBM i
AS/400 is the original IBM brand name, but AS400 is still how many IT professionals, executives, and administrators search for IBM i and IBM Power systems. The name changed over time. The business workloads did not disappear.
This site explains the full path from AS/400 to IBM i, from iSeries to IBM Power, and from legacy environments to modern Power11 infrastructure ... without jargon or sales pressure.
Knowledge Hubs
AS400 Learning Center
Foundational answers about the AS400 platform ... what it is, why it persists, and how it connects to modern IBM i and IBM Power systems.
IBM i Knowledge Base
IBM i is the operating system that runs on IBM Power Systems. This section covers how it works, how it's licensed, its roadmap, and what IBM i support looks like today.
IBM Power Hardware Center
IBM Power Systems are the hardware platform that runs IBM i workloads today. This section covers Power 9, Power 10, and Power 11 hardware, model history, and how to evaluate your current environment.
Power 11 Upgrade Hub
IBM Power11 is the current generation of IBM Power Systems, announced July 8, 2025. This section covers Power11 specs, pricing, and upgrade paths from Power9 and Power10 environments.
AS400 Modernization Center
AS400 modernization does not always mean migration. This section covers green screen modernization, API enablement, cloud integration, and when it makes sense to stay on IBM i.
Tools and Resources
Quick-reference tools for IBM i and AS400 administrators and evaluators: terminology glossary, IBM i version timelines, CPW charts, end-of-support dates, and upgrade checklists.
Start Here
The most common AS400 and IBM i questions, answered.
Definitions for AS400, IBM i, RPG, CPW, DB2 for i, and all related terminology.
Browse the AS400 Glossary →Planning an AS/400 upgrade or Power11 migration? Explore BigTech Reseller's IBM section for IBM Power and IBM i reseller options.
Explore IBM Section →Still Running IBM i Workloads?
Learn how AS/400-era environments map to modern IBM Power systems and when a Power11 upgrade makes sense for your organization.
Recent Articles
AS400 End of Life
AS400 end of life depends on which layer you mean: the original hardware brand, the IBM i operating system release, the Power server generation, or the business application running on top of it.
Read →AS400 OS
The AS400 OS was originally called OS/400. Today the operating system in that same platform lineage is IBM i, running on IBM Power Systems hardware.
Read →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.
Read →IBM pSeries vs iSeries
IBM pSeries and iSeries were different IBM server lines from the same broad Power-era family. pSeries was associated with AIX and UNIX workloads, while iSeries carried the AS400 and IBM i business application lineage.
Read →IBM FlashSystem and FlashCore Modules Explained for AS400/IBM i Shops
IBM FlashSystem is external, SAN-attached storage built on IBM's custom FlashCore Module NVMe drives. Here is what an AS400/IBM i shop needs to know before it comes up in a Power hardware conversation.
Read →AS400 History Timeline
This AS400 timeline tracks the platform from IBM's June 21, 1988 announcement through the 1995 RISC shift, the iSeries and System i rebrands, IBM i 7.5 and 7.6, and Power 5 through Power 11 milestone dates.
Read →Need IBM Power Reseller Options?
BigTech Reseller's IBM section helps buyers research IBM Power systems, AS400 upgrades, and IBM i solution providers.