[Àû¿ë´ë»ó: DOSBox-x]

If enabled, A20 gate is switched off when booting a guest OS.

Enabled by default. Recommended for MS-DOS when HIMEM.SYS is not installed in the guest OS.

If disabled, and MS-DOS does not load HIMEM.SYS, programs and features that rely on the 1MB wraparound will fail.
