• Intel Binary Compatibility Standard (iBCS)
    • an ABI developed by vendors of x86-based Unix vendors to allow binary compatibility between their respective implementations.
    • iBCS only standardises the kernel system call interface, not binary formats or library interfaces.
  • Real mode, also called real address mode, is an operating mode of 80286 and later x86-compatible CPUs.
  • In x86 computing, unreal mode, also big real mode, huge real mode, or flat real mode, is a variant of real mode (PE=0), in which one or more data segment registers have been loaded with 32-bit addresses and limits.

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