Flexible mainframe development and test on x86 hardware

IBM® z Systems® Development and Test Environment (previously named Rational® Development & Test Environment for System z®) is a platform for mainframe application demonstration, development, testing and education. It enables IBM z/OS® middleware and other z/OS software to run on Intel-compatible platforms without IBM Z® mainframe hardware. It emulates IBM Z architecture with virtual I/O and devices. It also provides role-based tools that allow you to create, manage and deploy your emulated environments for development and test activities.

Gain agility

Virtualize and reset z/OS on x86 hardware for prototyping and z/OS software version to version migration.


Gain the cost advantages of a distributed development and test system while freeing up mainframe capacity for more valuable production workloads.

Test early and often

Achieve higher quality and quicker delivery with a high fidelity z/OS development and test environment (no software simulation).

Access latest z/OS runtimes

Use a preconfigured package of IBM z Systems software that includes z/OS and middleware, such as CICS®, IMS™ and Db2®, including z/OS components of multiple DevOps for Enterprise Systems tools.

Build your team’s mainframes skills

Conduct z Systems education virtually any time and anywhere by using Intel and Intel-compatible platforms—and experiment without fear of harming mainframe production environments.

IBM z Systems Development and Test Environment features

  • z/OS development and test on x86 hardware
  • Self-service build and deployment tools (New feature in V11)
  • Current levels of the IBM z/OS middleware
  • IBM Z systems education environment