Programming was broadcast to the buses via a proprietary radio unit, which downloads BusRadio programming.
Micro Channel architecture, a commonly cited historical example of proprietary hardware
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Measured data internal to the ECU, e.g. intermediate results of a computational function, can be accessed via the ECU’s standard interfaces (CAN, FlexRay, LIN, Ethernet) via proprietary hardware interfaces.
Emulating such an architecture programmatically on a PC, characterised by the emphasis put on floating-point operations, and specialised graphics hardware with memory separate from the system memory would be extremely difficult, especially taking into account the scarcity of documentation typical for specialised, proprietary hardware.