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getpsp() Get the Program Segment Prefix
#include <dos.h>
unsigned getpsp(void);
getpsp() uses DOS call 0x62 to get the segment address of the program
segment prefix.
Returns: The segment value of the PSP.
Notes: getpsp() can only be called using DOS 3.x. For versions
of MS-DOS 2.x and 3.x, the global variable '_psp' set by
the startup code can be used instead.
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