AS400 ERP Guide: Is the IBM AS/400 Outdated — and What Should You Do?
Sections: AS/400 Legacy, Why AS/400 Still Matters, Need for Modern ERP, Future Business Growth
By Ximple Team
•
•
3–4 min read
•
IBM AS/400
If you’re in the wholesale or distribution industry, you’ve likely heard the term AS/400. This name, while sounding a bit dated, refers to a legacy IBM server that has been the backbone of countless businesses for decades. But in an era of cloud computing, is it still a viable solution?
The AS/400 (also written AS400, later renamed iSeries and now IBM i on Power Systems) is a midrange computer platform IBM introduced in 1988 — hardware, operating system, and the DB2 database in one integrated box, famous for running businesses for decades without failing.
Is AS400 an ERP system? No. The AS/400 is the platform, not the ERP: the ERP is software that runs on it — JD Edwards, Infor, MAPICS, and most of the legacy ERPs that wholesale distributors still run today were built on the AS/400. When people say “AS400 ERP,” they usually mean that combination: a business system whose software and hardware are now decades old, even if it still works every day.
The Legacy Behind the Name
The AS/400 was a workhorse of a server, originally launched by IBM in 1988. It was designed to be an all-in-one business solution, handling everything from inventory and accounting to customer data. Over the years, it has gone through several rebrands — AS/400 (1988), then eServer iSeries, then IBM System i — and today the platform lives on as IBM i running on IBM Power Systems hardware.
What makes it so remarkable is its backward compatibility. This means that RPG and COBOL programs written for the original AS/400 — with the integrated DB2 database underneath and, in many warehouses, the same green screen terminals in front — can still run on the newest IBM Power Systems today. This longevity is why so many companies, particularly in manufacturing and distribution, still rely on it.
The Enduring Appeal of the AS/400
Despite its age, the AS/400 platform has a reputation for being incredibly reliable and secure. It’s known for its:
- Rock-Solid Stability: The system is built to run for years without crashing.
- Built-in Security: Its object-based operating system makes it highly resistant to viruses and malware.
- Scalability: It can handle massive workloads, making it perfect for growing businesses with high transaction volumes.
Under the Hood: Architecture and Lineage
The AS/400 didn’t appear from nowhere. IBM built an object-based operating system with single-level storage into the System/38 in 1978, followed it with the System/36 in 1983, and folded both lines into the AS/400 in 1988 — an integrated machine with the relational database (DB2/400, today Db2 for i) built in rather than bolted on. In 2000 it was rebranded eServer iSeries, in 2006 System i running i5/OS, and in 2008 the hardware merged into IBM Power Systems, with the operating system renamed IBM i. IBM still ships a new IBM i release roughly every three years, with updates in between — which is why a machine designed in the 1980s can run web services and modern APIs today. The architecture, not nostalgia, is why it refuses to die: object-based security, single-level storage, and an integrated database make it extraordinarily stable — and make the ERP software written on top of it very hard to walk away from.
The Case for a Modern ERP System
While the AS/400 is a powerful and reliable system, it wasn’t built for the modern, connected world of business. Today’s wholesalers and distributors need a solution that offers:
- Real-time Mobile Access: The ability to check inventory and process orders from a smartphone or tablet.
- Cloud-Based Flexibility: A system that is accessible from anywhere and doesn’t require expensive on-site hardware and maintenance.
- Seamless Integration: The ability to easily connect with third-party software like e-commerce platforms, shipping carriers, and marketing tools.
An AS/400 system often requires specialized technical knowledge and can be complex to integrate with new technology. This can lead to increased costs and slower adoption of new business processes.
So which path makes sense — keep the AS/400, or replace what runs on it? That fork is the next section.
Modernizing an AS/400 ERP: Host It in the Cloud, or Replace It?
When an AS/400 system starts to feel like a risk — the last RPG developer retires, the hardware ages, the ERP vendor’s roadmap goes quiet — there are really two paths, and they solve different problems.
Path one is AS/400 cloud hosting: lift the IBM i environment into a hosted Power Systems cloud. The hardware risk goes away; the software stays exactly as old as it was. This is the right call when the applications still fit the business and only the iron is the problem.
Path two is replacing the ERP itself with a cloud-native system. This is the bigger project — and the right one when the software, not the hardware, is what’s holding the business back: green-screen order entry new hires can’t learn, pricing logic nobody dares touch, and no path to eCommerce, mobile warehouse scanning, or live dashboards.
For wholesale distributors the fork is especially common, because most legacy distribution ERPs were built on the AS/400. If that’s the system running your counter, warehouse, and accounting, the question isn’t the hardware — it’s whether a wholesale distribution ERP software platform built cloud-native does what your AS/400 ERP does, without the parts that hurt. That comparison is exactly what a demo is for: bring your green-screen workflow and see the same work done in Ximple ERP.
Conclusion
The AS/400 earned its reputation: stable, secure, and still running businesses decades after launch. But the question in 2026 isn’t whether the platform works — it’s whether the ERP software on top still fits how you sell, ship, and grow. If the hardware is the only problem, cloud hosting solves it; if the software is the problem, it’s time to look at cloud-native ERP. Weighing a move? Download our free ERP Buyer’s Guide for distributors — the questions to ask any vendor, including us.
FAQ
Because cloud ERP offers better accessibility, lower infrastructure costs, mobile access, and easier integration with modern business applications.
Manufacturing, wholesale distribution, logistics, and finance companies still widely use AS/400 due to its reliability and security.
Limited modernization, outdated interfaces, high maintenance costs, and difficulty integrating with modern software platforms.
No. The AS/400 is a computer platform — hardware, operating system, and database in one. The ERP is software that runs on it, like JD Edwards, Infor, MAPICS, and most legacy distribution ERPs. “AS400 ERP” usually means that combination of aging software on the AS/400 platform.
Yes — widely. IBM still sells and supports the platform (as IBM i on Power Systems), and it remains common in banking, manufacturing, and wholesale distribution. The hardware is rarely the problem; the decades-old ERP software running on it usually is.
The platform is not being discontinued — IBM maintains a public roadmap for IBM i. What is going away is vendor investment in many of the old ERP applications built on it, along with the RPG developers who maintain them. That, not the hardware, is why companies modernize.
In name, nothing replaced it — IBM renamed it iSeries, then System i, and today it is IBM i on Power Systems. At the software layer, the replacement for an aging AS/400 ERP is a cloud-native ERP, which trades green screens and on-premise hardware for browser screens, mobile scanning, and live dashboards.
Table of Contents
Running a green-screen ERP? Bring one workflow to a demo — order entry, a price change, month-end — and watch the same work done in Ximple, side by side. The Request a Demo button stays exactly as it is.
