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Break through the limit of 640K
Although the general program can only use 640K in real mode, but the DOS 5 provides the use of HMA and UMB memory in real mode, break through the limit of 640K. High memory area is about 64K (HMA, High Memory Area) the real mode maximum bit address up to FFFF:FFFF = 10FFEF h address, which has exceeded the upper bound of the 1 Mega real mode
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