(a) Microcomputer: A computer when constructed with microprocessor IC instead of the CPU, is called microcomputer. So the processing of a data is done by that particular microprocessor.But the microprocessor's function depends upon the hexadecimal number system though it is data or the memory location.
the capacity of the microprocessor is indicated as N = 2^n, [n = the unit of that particular work]
So, if a microcomputer has 20-bit address line, so it can address 2^20 memory location.