A semi-inserted PCI-X card in the 32-little bit PCI slot, illustrating the necessity for that rightmost notch and the additional place within the motherboard to stay backward suitable PCI delivers different memory and memory-mapped I/O port address spaces for your x86 processor household, 64 and 32 bits, respectively. Addresses in https://nathanlabsadvisory.com/nerc-cip-compliance/