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In an $8085$ microprocessor system with memory mapped $I / \mathrm{O}$,

1. $\text{I/O}$ devices have $16$-bit addresses
2. $\text{I/O}$ devices are accessed using $\text{IN}$ and $\text{OUT}$ instructions
3. there can be a maximum of $256$ input devices and $256$ output devices
4. arithmetic and logic operations can be directly performed with the $\text{I/O}$ data.