The origin of these ports were mostly either internal HP Labs projects or HP products, or academic research (mostly the University of Utah).
When the HP 9000 systems became able to handle real-time processes, the RTE systems declined.
HP ARIES (Automatic Re-translation and Integrated Environment Simulation) is a dynamic binary translation system that combines fast code interpretation with two phase dynamic translation to transparently and accurately execute HP 9000 HP-UX applications on HP-UX 11i for HP Integrity servers.
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The ARIES emulation engine also implements Environment Emulation which emulates an HP 9000 HP-UX application's system calls, signal delivery, exception management, threads management, emulation of HP GDB for debugging, and core file creation for the application.
Rocky Mountain BASIC - Created at HP, now transferred to Agilent; HP 9000 and other platforms; often used with HP-IB instruments