问题
IAPX88 can deal with 1 mega byte memory(20 bit addressing), now my question is how we make a 20 bit address by using two 16 bit registers.please give an example.
回答1:
IAPX88 physical addresses are computed by taking the segment register, shifting it to the left 4 bits, and adding the offset register.
For example, the physical address in memory that code executes is (CS<<4)+IP where CS is the Code Segment and IP is the Instruction Pointer.
You can get details on the Intel 8086 wikipedia page.
来源：https://stackoverflow.com/questions/2484224/how-to-make-20-bit-address-by-using-two-16-bit-registers