Function 62h Get PSP Address entry AH 62h return BX Segment address of the program segment prefix. note 1) Before a program receives control from MS-DOS , its PSP is set up to contain certain vital infromation, such as: - the segment address of the program's environment block - the command line originally entered by the user - the original contents of the terminate, Ctrl-C, and critical-error handler vectors - the top address of available RAM. 2) The segment address of the PSP is normally passed to the program in registers DS and ES when it initially receives control from MS-DOS. Theis function allows a program to conveniently recover the PSP address at any point during its execution, without having to save it at program entry. 3) (DOS 3.x, ?4-) Cannot be used by any memory resident routine to obtain its PSP address. This is because once the routine has executed a Keep Process or Terminate & Stay Resident function, MS-DOS no longer considers the routine active. The Get PSP function only applies to the program last loaded by MS-DOS, which MS-DOS considers to be the currently active program.
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