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--- hardware:doku:techrefguide:abschnitt3 [25/05/2020 21:05] – Fehler in int 61H Fn 2CH korrigiert. karlmueller
+++ hardware:doku:techrefguide:abschnitt3 [13/06/2020 18:06] (aktuell) – Beispiel zum DTMF karlmueller
@@ Zeile 324: / Zeile 324: @@
              DL   0       aus
              DL   1       ein
+\\
+Die Beschreibung zum DTMF ist nicht ganz vollständig, deshalb hier ein kurzes Programmteil:
+  ; Quelle: ATARI.RSC Vol. V, Issue 2 December 1992
+  ; DTMF duration testing under
+  ; assembled under TASM
+  ; 2710h(10000) = short duration,
+  ; 72e3h(29411) = default duration
+	.model small
+	.stack 100h
+	.data
+  dtmf_dur	dw	0
+  temp		dw	0
+  numstr	db	'00001111',0
+        .code
+  mov	ax,	@data
+  mov	ds,	ax
+  mov	ah, 18h			; Mute States call
+  mov	al, 08h			; Get DTMF duration
+  int	61h
+  mov	dtmf_dur, dx	        ; save old duration value
+                                  ; from register
+  mov	ah,	18h		; Mute States call
+  mov	al,	09h		; Set DTMF duration
+  mov	dx,	2710h		; stuff new duration value
+  int	61h			; into register
+  mov ah, 17h			; dial number to check tone
+  mov	temp, @data		; duration
+  mov	ds,	temp
+  mov	si,	OFFSET numstr
+  mov	cx,	8h		; length of string = 8 characters
+  int	61h
+  mov	dx, dtmf_dur	        ; stuff old duration value
+                                  ; into register
+  mov	ah,18h			; Set DTMF duration
+  mov	al,09h
+  int	61h
+  mov	ah, 17h			; dial number to recheck
+                                  ; old tone duration
+  mov	temp, @data
+  mov	ds,	temp
+  mov	si,	OFFSET numstr
+  mov	cx,	8h
+  int	61h
+  ;;;;;;;;;;;;;;;;;
+  ;terminate
+  mov	ah,4ch
+  int	21h
+  end
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