[Àû¿ë´ë»ó: DOSBox-x]

If set, try to allocate the EMM system handle on an even megabyte.

If the DOS game or demo fiddles with the A20 gate while using EMM386.EXE emulation in virtual 8086 mode, setting this option may help prevent crashes.

However, forcing allocation on an even megabyte will also cause some extended memory fragmentation and reduce the overall amount of extended memory available to the DOS game depending on whether it expects large contiguous chunks of extended memory.
