DOS_AllocateMemory( segment: 128, blocks: 14446 )

Hope your logging is correct. The first parameter of that function is to
return the segment (128 decimal in your case i assume) so in the dosbox
debugger d 80:0 shows the allocated memory (not much there i guess)
and d 7f:0 is the MCB of that memory.

DOS_ReadFile( name: STUNTS11\AD15.DRV, amount: 3571 )

readfile has three parameters, the second being the temp buffer. That is
usually copied into the emulated memory within the callback, see dos.cpp

that is my logging code

LOG(LOG_MISC,LOG_NORMAL)("DOS_AllocateMemory( segment: %X, blocks: %d = %d bytes )", *segment, *blocks, (*blocks)*16 );

and

LOG(LOG_FILES,LOG_NORMAL)("DOS_ReadFile( name: %s, amount: %i )", Files[handle]->name, *amount );

Bit8u * data is missing here
...

and memdumpbin works the same

Well the trick might be WHERE you put those. At the start of the functions is surely wrong.

Bit8u * data is missing here

Indeed. But as i said this is only a temp buffer, so of no immediate use.

>Well the trick might be WHERE you put those

when all return data is set

btw: it seems to work now the memdumpbin looks nearly
like the loaded file