3 ms·
Extended memory (XMS) is RAM that is addressed above the first megabyte of the address space. Expanded memory (EMS) is bank switched RAM that stays inside the
by LeoPanthera 4y ago
Extended memory (XMS) is RAM that is addressed above the first megabyte of the address space.
Expanded memory (EMS) is bank switched RAM that stays inside the 640K barrier.
- anyfoo 4y ago> that stays inside the 640K barrier Yes, but to be super pedantic, it stayed within the 1MB barrier[1] that real mode could "officially" address. It was perfectly okay to have your EMS window above the A000h segment in memory, i.e. above 640k, if no device was using it. [1] Plus some change known as the "high memory area" (HMA), an artifact of how linear addresses are calculated from segment and offset.