internal and external address bus

Question

Based on my knowledge,i know there is external and internal data bus,but i wonder if there is internal and external address bus as i saw a diagram showing intel 8088 microprocessor with this two thing mention,anybody mind explain the two of it??thanks

Answer 1

Yes. The 8088 internal address bus was a 20-bit bus. The interface to external chips was via 20 pins, of which 8 are shared with the external data bus. The ALE (Address Latch Enable) signal is used by off-chip hardware to latch the 20-bit address while it is present on the pins.