Intel PCM-9387 - page 84

PCM-9387 User’s Manual 72
MOV DX,2EH
MOV AL,F6H
OUT DX,AL
MOV DX,2FH
MOV AL,05H ; Set 5 seconds
OUT DX,AL
;------------------------------------------
; Exit extended function mode |
;------------------------------------------
MOV DX,2EH
MOV AL,AAH
OUT DX,AL