You need 20 bits of address bus to address 1 Mb of memory.
32 bits wide
For the Pentium the front side data bus is 64 bits wide. The back side is 32 bits wide.
The address bus in the 8085 is 16 bits wide.
32 bit
16
8
A 386SX processor has 16-bits and 386DX has 32-bits
Universal Serial Bus (USB) is a serial bus standard to interface devices to a host computer.
MCA is a 32 bit expansion bus
The USB part stands for Universial Serial Bus.
The 8086/8088 has an internal 20-bit address bus and 16-bit data bus. Externally, the address bus is 20-bits, and the data bus is 16-bits for the 8086 and 8-bits for the 8088.The data bus in the 8086 is 16 bits in size, while the address bus is 20.