Question

The advantage of I/O mapped devices to memory mapped is ___________

(a) The former offers faster transfer of data

(b) The devices connected using I/O mapping have a bigger buffer space

(c) The devices have to deal with fewer address lines

(d) No advantage as such

The question was posed to me during an interview for a job.

I need to ask this question from Accessing I/O Devices in portion Input/Output Organisation of Computer Architecture

Answer 1

Correct choice is (c) The devices have to deal with fewer address lines

The explanation is: Since the I/O mapped devices have a separate address space the address lines are limited by the amount of the space allocated.