Introduction The address bus has 8 signal lines A8 – A15 which are unidirectional. Demultiplexing of AD7-AD0 From the above description, it becomes address bus. To demultiplex the address signals from the address/data pins (AD0-AD15) a latch must be used to grab the addresses. - In 8086 microprocessorThe data bus and the low order address bus on the 8085 microprocessor are multiplexed with each other. This allows 8 pins to be used where 16 would normally be The low – order address bus of the 8085 microprocessor is multiplexed (time shared) with the data bus . The buses need to be demultiplexed.