Question

If A1=0, A0=1 then the input read cycle is performed from

(a) port A to data bus

(b) port B to data bus

(c) port C to data bus

(d) CWR to data bus

The question was asked in examination.

The above asked question is from PIO 8255 (Programmable Input in portion Basic Peripherals and their Interfacing with 8086/88 of Microprocessor

Answer 1

Correct option is (b) port B to data bus

To elaborate: If A1=0, A0=1 then the input read cycle is performed from port B to data bus.