--- np2/io/iocore.c	2005/02/12 12:40:39	1.21
+++ np2/io/iocore.c	2005/04/08 19:39:09	1.22
@@ -68,8 +68,16 @@ static	UINT8		ioterminate[0x100];
 static void IOOUTCALL defout8(UINT port, REG8 dat) {
 
 #if !defined(DISABLE_SOUND)
-	if ((port & 0xfff0) == cs4231.port) {
-		cs4231io_w8(port, dat);
+	UINT	tmp;
+
+	tmp = port - cs4231.port[0];
+	if (tmp < 8) {
+		cs4231io0_w8(port, dat);
+		return;
+	}
+	tmp = port - cs4231.port[5];
+	if (tmp < 2) {
+		cs4231io5_w8(port, dat);
 		return;
 	}
 #endif
@@ -83,8 +91,15 @@ static void IOOUTCALL defout8(UINT port,
 static REG8 IOINPCALL definp8(UINT port) {
 
 #if !defined(DISABLE_SOUND)
-	if ((port & 0xfff0) == cs4231.port) {
-		return(cs4231io_r8(port));
+	UINT	tmp;
+
+	tmp = port - cs4231.port[0];
+	if (tmp < 8) {
+		return(cs4231io0_r8(port));
+	}
+	tmp = port - cs4231.port[5];
+	if (tmp < 2) {
+		return(cs4231io5_r8(port));
 	}
 #endif
 	if ((port & 0xf0ff) == 0x801e) {