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The CPU-CORE as described in the eZ80 User Manual (UM0077) does of course not reserve any I/O, but all real silicon eZ80 contain additional peripherals (*1), reserving the whole address range of 0080h..FFh for them. See for example the eZ80190 Product Specification (PS0066) section Register Map on p.23: All on-chip peripheral registers are accessed in the I/...

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