Top 9 Questions About AS400 Green Screen Modernization Answered

AS400 (now IBM i) continues to be a rock-solid platform trusted by companies for its reliability, performance, and scalability. Yet, many organizations still rely on traditional 5250 green screen interfaces – functional but outdated – which can hold back user efficiency, complicate integrations, and make it harder to onboard new talent.

The exciting part?

You don’t need to replace your system to move forward.

AS400 green screen modernization offers a smart way to retain the strength of your existing applications while upgrading the user experience with modern web, mobile, or GUI-based interfaces. With the right approach, businesses can improve productivity, reduce training costs, and integrate with modern technologies, all without rewriting decades of valuable code.

Let’s now explore the most asked questions by decision-makers like you around green screen modernization and discover how your business can benefit from a smarter, more user-friendly AS400 environment.

At Integrative Systems, we help businesses transform their IBM i applications with minimal risk and maximum return. If you’re ready to enhance performance, reduce training time, and give your team a modern user experience – you’re in the right place.

Let’s begin!

Is AS400 a green screen?

Ans – No, AS400 is not a green screen itself – it’s a midrange computer system developed by IBM (now known as IBM i). However, various users associate AS400 with “green screen” interfaces because traditional access to AS400 applications is done through a text-based terminal that has a green-on-black display.

• The green screen is just one way to interact with AS400 applications.
• Modern AS400 systems support graphical interfaces and web-based access.
• Businesses can upgrade or modernize green screen apps for better usability.
• The “green screen” look comes from legacy 5250 terminal emulators, not the AS400 hardware.

While the green screen is iconic, AS400 systems today are capable of much more.

What are 5250 green screens in AS400?

Ans – 5250 green screens are text-based user interfaces used to interact with AS400 (now IBM i) systems. They get their name from the old green-colored monitors originally used to display them. These screens allow users to run programs, enter data, and manage system operations without a graphical interface. They’re fast, reliable, and still widely used in industries like banking, logistics, and manufacturing.

What is GUI in AS400?

Ans – GUI (Graphical User Interface) in AS400 refers to a visual interface that makes it easier to interact with the IBM i (AS400) system, visually appealing interfaces with graphics, icons, and easier navigation. This makes it simpler for users to interact with AS400 applications, improving usability and efficiency.

What is AS400 application GUI modernization?

Ans – AS400 application GUI modernization is the process of updating the old, text-based user interface of IBM’s AS400 (now IBM i) systems to a modern, graphical interface. This helps businesses make legacy applications easier to use, more visually appealing, and accessible on web and mobile devices. Benefits include –

• Improved user experience and productivity
• Better integration with modern systems
• Reduced training time for new users
• Extended lifespan of core business applications

Modernization can be done without rewriting the entire application, making it cost-effective and less risky.

What are the challenges of IBM i green screen modernization?

Ans – Modernizing IBM i green screens can be challenging due to a few key factors –

• Legacy code complexity – Many applications are built on old RPG or COBOL code, making them hard to update.
• Lack of documentation – Over time, original developers may have left, and system documentation is often incomplete or outdated.
• Skill gaps – Fewer developers today are familiar with the IBM i platform, especially green screen environments.
• Risk of disruption – Modernization efforts can impact core business processes if not carefully planned.
• Cost and time - While modernization is less expensive than a full rewrite, it still requires investment in tools, expertise, and testing.

To succeed, organizations need a clear strategy, the right tools, and experienced IBM i professionals to guide the transition.

How much does AS400 GUI modernization cost?

Ans – The cost of IBM i/AS400 GUI modernization varies based on various factors. These aspects include application size, complexity and scope, customization requirements, consultation fees, and development costs. To get an estimated quote for your project, contact us today.

Integrative Systems provides competitive pricing without quality compromise. Reach out to us and get an accurate valuation of your project.

What are the various techniques for IBM i/AS400 application GUI modernization?

Ans – IBM i (AS400) applications can be modernized using several techniques to improve user experience and extend functionality. Common GUI modernization methods include –

• Screen scraping – Converts green-screen interfaces into graphical web-based UIs without changing the underlying code.
• Refacing tools –Use software to automatically apply a modern GUI over existing 5250 screens.
• API integration – Expose business logic through APIs, enabling new front-end interfaces (web, mobile, desktop).
• Code transformation – Rewrite or refactor legacy RPG or COBOL code into modern languages like Java or .NET.
• Hybrid approaches – Combine multiple techniques to preserve core functionality while adding modern capabilities.

Choosing the right method depends on your budget, timeline, and long-term IT strategy.

Can AS400 green screen applications be integrated with newer systems?

Ans – Yes, AS400 green screen applications can be integrated with modern systems using various proven methods. Integration options include –

• APIs and Web Services – Connect AS400 data with cloud platforms or web apps.
• Database Access – Modern tools can read/write directly to the AS400 database.
• Screen Scraping/Automation – Extract data from green screens for use in new interfaces.

These approaches help businesses modernize workflows without replacing the entire AS400 system.

What are the strategies for AS/400 green screen modernization?

Ans - There are many AS400 green screen modernization strategies offered. You can select any of these, based on your technical and business needs.

• GUI Modernization – Transform IBM green screens into modern-day web-based interfaces. This involves no change in the core business logic.
• API Integration – Enable AS400 applications to communicate with third-party systems using APIs.
• Web Enablement – Translate AS400 applications into web interfaces. This improves accessibility & alignment with modern-day business needs.
• Cloud Migration – Shift AS400 workloads to the cloud environment. This enables improved scalability & accessibility.
• Re-engineering – Rewrite or refactor legacy AS400 applications. This allows improvements in functionality and user experience.

Transform Your AS400 Green with Integrative Systems

When it comes to modernizing your AS400 applications, we are the partners you can trust.

Why?

We are an IBM Silver Business partner with a legacy of 25+ years.

Our team of IBM i professionals leverages their wealth of knowledge and expertise to handle every aspect of delivering tailored solutions and maximizing your return on investment.

We understand that the AS400 (application) green screen modernization is beyond appealing aesthetics. It’s about achieving complete system enhancement.

By choosing Integrative Systems, you get more than just a technological partnership. You get a team of experienced professionals striving for your success and growth.

Reach out to us at contact@integrativesystems.com with your IBMi (application) green screen modernization needs, and our team of experts will respond within 1–2 business days.