By multiplying the Segment Address by 16, you turn it into a 20 bit value by appending four zero ... The 8088 will put FFFF0 on its address bus. But from the hardware’s perspective, this ...

In practice, 8-bit, 16-bit, 32-bit and 64-bit architectures ... mice and other external devices. See bus. The size of the address register determines how much memory the CPU can directly address.