When the 80286 arrived with 24-bit addressing, addresses that previously looped around now referenced actual higher memory locations, breaking older software. IBM's solution involved gating the 21st address line (A20, counting from zero) through an AND circuit, normally holding it at zero to preserve backward compatibility. To utilize extended memory, software had to activate this A20 gate. To minimize added components, IBM connected the gate's control to an unused pin on the keyboard controller. Sending specific commands to this controller would switch the system from legacy mode and unlock the additional, costly memory.
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，这一点在搜狗输入法中也有详细论述
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