80386, as a member of the 80X86 family, must be backward compatible, that is, it must support both 16-bit processors and 32-bit processors. In the 8086, all registers are 16-bit. Let's take a look at the changes in the registers in the 80386:
· Extend the 16-bit general-purpose registers, flag registers, and instruction pointer registers to 32-bit. The register
· segment register is still 16 bits.
· Add 4 32-bit control registers
· Add 4 system address registers
· Add 8 mode registers
· ; Add 2 test registers
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