Program Segment Prefix: Difference between revisions

Revision as of 07:56, 21 September 2015

Revision as of 03:14, 14 November 2015

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| 00h-01h

| 2 bytes (code)

| [[CP/M-86|CP/M]] exit (always containcontains [[INT 20h]])

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| 02h-03h

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The PSP is most often used to get the [[argc|command line arguments]] of a DOS program,; for example, the command "FOO.EXE /A /F" executes FOO.EXE with the arguments '/A' and '/F'.

The segment address of the PSP is passed in the DS register when the program is executed. It can also be determined later by using Int 21h function 51h or Int 21h function 62h. Either function will return the PSP address in register BX.<ref>{{cite web|url=http://www.htl-steyr.ac.at/~morg/pcinfo/hardware/interrupts/inte8fjk.htm|title=INT 21h,62h - Get PSP address (DOS 3.x)}}</ref>