The I/O port addresses, that are not used, while designing practical systems around 80286 are
(a) 0000H to 00FFH
(b) 00FFH to FFFFH
(c) 00F8H to 00FFH
(d) 0000H to FFFFH
This question was addressed to me in examination.
My enquiry is from 80286 Minimum System Configuration, Interfacing Memory and I/O Devices With 80286 in portion 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor