;SOUND EFFECT GENERATOR
;SQUARE WAVE STYLE
;
STACK	  SEGMENT PARA STACK 'SATCK'
	  DB 256 DUP (0)
STACK	  ENDS
;
;
DATA	  SEGMENT PARA PUBLIC 'DATA'
FREQ	  DW 300	; LOWER VALUE TO RAISE FREQ
DURA	  DW 160	;INCREASE VALUE INCREASE DURATION
DATA	  ENDS
;
;
CODE	  SEGMENT PARA PUBLIC 'CODE'
MK_TONE   PROC FAR
	  ASSUME CS:CODE,SS:STACK
	  PUSH DS
	  SUB AX,AX
	  PUSH AX
	  ASSUME DS:DATA
	  MOV AX,DATA
	  MOV DS,AX
	  CLI
	  MOV DX,DURA
	  IN AL,61H
	  AND AL,0FEH
AGAIN:	  OR AL,2
	  OUT 61H,AL
	  MOV CX,FREQ
WAIT1:	  LOOP WAIT1
	  AND AL,0FDH
	  OUT 61H,AL
	  MOV CX,FREQ
WAIT2:	  LOOP WAIT2
;
;ONE SQUARE WAVE CYCLE NOW COMPLETE
;
	  DEC DX
	  JNZ AGAIN
;
;TONE HAS NOW BEEN PRODUCED FOR DESIRED DURATION
;
	  STI
	  RET
MK_TONE   ENDP
CODE	  ENDS
	  END MK_TONE
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