8086 supports 1M byte of memory. To address 1MB, we need 20 address lines and the 20 bit address ranges from 00000000000000000000 –to- 11111111111111111111 i.e. 00000h to FFFFFh. The memory is constructed using RAM and ROM /EEPROM chips. 1MB  memory can be contagiously organized as memory or can be organized in banks of odd and even address memory so as to access 8 or 16 bit of data. The 8-bit data thus we can either access bytes from even address on data lines D0-D7 and data from odd address on the data bus D8-D15. Approached to Memory organization: i.  As one contiguous block: Memory can be organized as one contiguous block of memory as in 8085 based systems. In this case 8-bit data