mov dx, SegmentPSP ;segment address to receive PSP
mov ah, 26h ;Create New PSP
int 21h
Create New PSP (Function 26h) creates a new program segment prefix (PSP), copying it to the beginning of the segment specified by the SegmentPSP parameter.
This function has been superseded by Load and Execute Program (Function 4B00h).
SegmentPSP
Specifies the address of a segment to receive the new PSP.
This function has no return value.
This function is intended to be called only by .COM programs. When a program calls this function, the CS register must contain the segment address of the PSP.
Function 4B00h Load and Execute Program