However, many mainframe operating systems require vendor licenses to run legally. Hercules is technically compatible with all IBM mainframe operating systems, even older versions which no longer run on newer mainframes. ![]() There are two exceptions: Hercules uses hardware assists to provide inter-processor consistency when emulating multiple CPUs on SMP host systems, and Hercules uses assembler assists to convert between little-endian and big-endian data on platforms where the operating system provides such services and on x86/ x86-64 processors. ![]() Its developers ruled out using machine-specific assembly code to avoid problems with portability even though such code could significantly improve performance. The emulator is written almost entirely in C.
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