DOS/32 Advanced DOS Extender - Programmer's Reference
2.35 - DPMI function 050Ah - Get Memory Block Size and Base
Returns the size of a memory block that was previously allocated with DPMI function 0501h.
||AX = 050Ah
SI:DI = memory block handle
SI:DI = size of memory block (bytes)
BX:CX = base address of memory block
AX = error code
8023h - invalid handle
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