diff --git a/Source/HBIOS/cvdu.asm b/Source/HBIOS/cvdu.asm
index 770a3f6d..eb7e19d5 100644
--- a/Source/HBIOS/cvdu.asm
+++ b/Source/HBIOS/cvdu.asm
@@ -282,7 +282,6 @@ CVDU_PROBE:
 	CALL	CVDU_WR			; WRITE VALUE TO LOC 0, ADR PTR INCREMENTS
 	CPL				; INVERT TEST VALUE
 	CALL	CVDU_WR			; WRITE INVERTED VALUE TO LOC 1
-	CALL	SPK_BEEP	
 	; READ TEST PATTERN BACK TO CONFIRM HARDWARE EXISTS
 	LD	HL,0			; POINT TO FIRST BYTE OF VRAM
 	LD	C,18			; ADDRESS REGISTER PAIR