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.
16
32 bit
8
Universal Serial Bus (USB) is a serial bus standard to interface devices to a host computer.
A 386SX processor has 16-bits and 386DX has 32-bits
MCA is a 32 bit expansion bus
The USB part stands for Universial Serial Bus.
A Computer Bus is usually the USB Ports, and there used for USB Plugging things.