Among the tools developed to support Digital's Alpha AXP program were four software simulators. The Mannequin and ISP instruction set simulators were used to port the OpenVMS and OSF/1 operating systems to the Alpha AXP platform. The Alpha User-mode Debugging Environment (AUD) allowed Alpha AXP user-mode code to be debugged with support from the OpenVMS VAX runtime environment on VAX hardware. AUD was built from a combination of new and existing Digital software components. The Alpha User-mode Debugging Environment for Translated Images (AUDI) allowed translated images to be debugged on a simulator running on a VAX computer. With these debugging environments, user-mode applications and code components could be tested before Alpha AXP hardware and operating system software were available.
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