Hello Veit,

  VK> The interesting line is "Upper" in yours and
"High" in mine. I
    > assume that both mean the area of memory that is 1MiB..1MiB+64
    > KiB-1.

The "High Memory Area" (HMA) is the first 64 Kb of extended
memory, (100000-100FFFF hex) apparently visible to DOS apps because of a
bug in the 80286 that was preserved because it was deemed useful.
"Upper Memory Blocks" (UMBs) are blocks of RAM between the 640 Kb
ceiling and the HMA (unused parts of 0A0000-0FFFFF hex).  These can either
exist physically (unusual, but not unknown) or can be extended memory that
has been mapped into the first 1 Mb using tricks of the 80386 processor
(this is one of the things that EMM386 from Microsoft DOS could do).

- Andy Ball

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