Question

Latches are used in 80286 to

(a) demultiplex the address and data lines

(b) latch the address signals

(c) decode the select signals

(d) latch the address and decode the select signals

This question was posed to me in unit test.

My question is based upon 80286 Minimum System Configuration,  Interfacing Memory and I/O Devices With 80286 topic in chapter 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

Answer 1

Right choice is (d) latch the address and decode the select signals

For explanation I would say: The address and data lines are not multiplexed, hence no latches are required in 80286 system. Rather the addresses of the next bus cycle are displayed in advance, hence the latches are required for latching the address, and decode the signals.