Interrupt 21h Function 4Ch Terminate a Process (EXIT) Quit with ERRORLEVEL exit code entry AH 4Ch AL exit code in AL when called, if any, is passed to next process return none note 1) Control passes to DOS or calling program 2) return code from AL can be retrieved by ERRORLEVEL or function 4Dh 3) all files opened by this process are closed, buffers are flushed, and the disk directory is updated 4) Restores Terminate vector from PSP:000Ah Ctrl-C vector from PSP:000Eh Critical Error vector from PSP:0012h
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