CO and architecture

Question

Consider a hypothetical processor which supports the 64Kb physical memory.  Processor uses the memory mapped IO configuration in which the 3 MSB bits of the address is 1, then assign them to IO ports. How many IO address and how many memory address are possible in the processor.

Answer 1

i/o - 2¹³

memory- 7*2¹³

Comments

But how??

---

total addresses are 2¹⁶...

fixing 3 bits for i/o we will get 2¹³ addresses for i/o

now for memory we are left with 2¹⁶-2¹³=7*2¹³