If you use the 8088 kind of mapping method, then the 51 microcontroller can reach infinity

For example, using 8000H - FFFFH this 32K to slice switching, you can map the other chips to this 32K, slice selection if 8 lines, then there are 256 * 32K external data memory space

It is a good idea to use a chip to select a chip, but if you use a chip to select an external data memory space, then there are 256 * 32K external data memory space

It is a good idea to use an external data memory space. data memory space