DOS/32 Advanced DOS Extender - Programmer's Reference
2.56 - API function 03h - Get Access to Extended Memory Blocks
||AL = 03h
||BX = writeable data selector
ECX = total size of allocated extended memory
EDX = pointer to allocated extended memory (first byte)
ESI = pointer to top of allocated extended memory (last byte)
a) Selector returned in BX is a writeable data selector that should be used to access needed variables/addresses.
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