From 8a54b391f3c191d08b10fdd9a73843051954a3a3 Mon Sep 17 00:00:00 2001
From: b1ackmai1er <difficultylevelhigh@gmail.com>
Date: Sun, 28 Nov 2021 10:18:13 +0800
Subject: [PATCH] Update VGMPLAY.ASM

optimization
---
 Source/Apps/VGM/VGMPLAY.ASM | 30 ++++++++++--------------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/Source/Apps/VGM/VGMPLAY.ASM b/Source/Apps/VGM/VGMPLAY.ASM
index 61638c72..c0c1ddd7 100644
--- a/Source/Apps/VGM/VGMPLAY.ASM
+++ b/Source/Apps/VGM/VGMPLAY.ASM
@@ -458,43 +458,33 @@ VGMDEVICES:	LD	DE,MSG_PO
 ;
 		LD	A,(IX+0)
 		PUSH	AF
-		AND	%00000011
-		SRL	A
-		ADC	A,'0'
-		CP	'0'
-		JR	Z,NOSN
-		CALL	PRTCHR
+
 		LD	DE,MSG_SN
-		CALL	PRTSTR
+		CALL	CHKDEV
 ;
-NOSN:		POP	AF
+		POP	AF
 		SRL	A
 		SRL	A
 		PUSH	AF
 ;
-		AND	%00000011
-		SRL	A
-		ADC	A,'0'
-		CP	'0'
-		JR	Z,NOAY
-		CALL	PRTCHR
 		LD	DE,MSG_AY
-		CALL	PRTSTR
+		CALL	CHKDEV
 ;
-NOAY:		POP	AF
+		POP	AF
 		SRL	A
 		SRL	A
 ;		PUSH	AF
+
+		LD	DE,MSG_YM
 ;
-		AND	%00000011
+CHKDEV:		AND	%00000011
 		SRL	A
 		ADC	A,'0'
 		CP	'0'
-		JR	Z,NOYM
+		RET	Z
 		CALL	PRTCHR
-		LD	DE,MSG_YM
 		CALL	PRTSTR
-NOYM:		RET
+		RET
 ;
 ;------------------------------------------------------------------------------
 ; Mute Devices.