--- np2/cbus/pcm86io.c	2004/03/30 07:12:03	1.6
+++ np2/cbus/pcm86io.c	2004/06/17 10:09:46	1.9
@@ -19,6 +19,7 @@ static const SINT32 pcm86rescue[] = {PCM
 
 static void IOOUTCALL pcm86_oa460(UINT port, REG8 val) {
 
+//	TRACEOUT(("86pcm out %.4x %.2x", port, val));
 	pcm86.extfunc = val;
 	fmboard_extenable((REG8)(val & 1));
 	(void)port;
@@ -26,6 +27,7 @@ static void IOOUTCALL pcm86_oa460(UINT p
 
 static void IOOUTCALL pcm86_oa466(UINT port, REG8 val) {
 
+//	TRACEOUT(("86pcm out %.4x %.2x", port, val));
 	if ((val & 0xe0) == 0xa0) {
 		sound_sync();
 		pcm86.vol5 = (~val) & 15;
@@ -38,6 +40,7 @@ static void IOOUTCALL pcm86_oa468(UINT p
 
 	REG8	xchgbit;
 
+//	TRACEOUT(("86pcm out %.4x %.2x", port, val));
 	sound_sync();
 	xchgbit = pcm86.fifo ^ val;
 	// バッファリセット判定
@@ -50,15 +53,20 @@ static void IOOUTCALL pcm86_oa468(UINT p
 		pcm86.lastclock <<= 6;
 	}
 	if ((xchgbit & 0x10) && (!(val & 0x10))) {
-		pcm86.write = 0;
-		pcm86.reqirq = 0;
+		pcm86.irqflag = 0;
+//		pcm86.write = 0;
+//		pcm86.reqirq = 0;
 	}
 	// サンプリングレート変更
 	if (xchgbit & 7) {
 		pcm86.rescue = pcm86rescue[val & 7] << pcm86.stepbit;
 		pcm86_setpcmrate(val);
 	}
+#if 1	// これ重大なバグ....
+	pcm86.fifo = val;
+#else
 	pcm86.fifo = val & (~0x10);
+#endif
 	if ((xchgbit & 0x80) && (val & 0x80)) {
 		pcm86.lastclock = CPU_CLOCK + CPU_BASECLOCK - CPU_REMCLOCK;
 		pcm86.lastclock <<= 6;
@@ -69,6 +77,7 @@ static void IOOUTCALL pcm86_oa468(UINT p
 
 static void IOOUTCALL pcm86_oa46a(UINT port, REG8 val) {
 
+//	TRACEOUT(("86pcm out %.4x %.2x", port, val));
 	sound_sync();
 	if (pcm86.fifo & 0x20) {
 #if 1
@@ -97,6 +106,27 @@ static void IOOUTCALL pcm86_oa46a(UINT p
 
 static void IOOUTCALL pcm86_oa46c(UINT port, REG8 val) {
 
+//	TRACEOUT(("86pcm out %.4x %.2x", port, val));
+#if 1
+	if (pcm86.virbuf < PCM86_LOGICALBUF) {
+		pcm86.virbuf++;
+	}
+	pcm86.buffer[pcm86.wrtpos] = val;
+	pcm86.wrtpos = (pcm86.wrtpos + 1) & PCM86_BUFMSK;
+	pcm86.realbuf++;
+	// バッファオーバーフローの監視
+	if (pcm86.realbuf >= PCM86_REALBUFSIZE) {
+#if 1
+		pcm86.realbuf -= 4;
+		pcm86.readpos = (pcm86.readpos + 4) & PCM86_BUFMSK;
+#else
+		pcm86.realbuf &= 3;				// align4決めウチ
+		pcm86.realbuf += PCM86_REALBUFSIZE - 4;
+#endif
+	}
+//	pcm86.write = 1;
+	pcm86.reqirq = 1;
+#else
 	if (pcm86.virbuf < PCM86_LOGICALBUF) {
 		pcm86.virbuf++;
 		pcm86.buffer[pcm86.wrtpos] = val;
@@ -107,9 +137,10 @@ static void IOOUTCALL pcm86_oa46c(UINT p
 			pcm86.realbuf &= 3;				// align4決めウチ
 			pcm86.realbuf += PCM86_REALBUFSIZE - 4;
 		}
-		pcm86.write = 1;
+//		pcm86.write = 1;
 		pcm86.reqirq = 1;
 	}
+#endif
 	(void)port;
 }
 
@@ -121,25 +152,25 @@ static REG8 IOINPCALL pcm86_ia460(UINT p
 
 static REG8 IOINPCALL pcm86_ia466(UINT port) {
 
-	UINT32	nowclk;
 	UINT32	past;
+	UINT32	cnt;
+	UINT32	stepclock;
 	REG8	ret;
 
-	// こんなんでお茶濁すんなら　ちゃんと書き直しましょうね　漏れ…
-	if (!(pcm86.fifo & 0x80)) {
-		ret = 0;
-	}
-	else {
-		sound_sync();
-		nowclk = CPU_CLOCK + CPU_BASECLOCK - CPU_REMCLOCK;
-		nowclk <<= 6;
-		past = nowclk - pcm86.lastclock;
-		if (past >= pcm86.stepclock) {
-			RECALC_NOWCLKWAIT;
-			past = nowclk - pcm86.lastclock;
+	past = CPU_CLOCK + CPU_BASECLOCK - CPU_REMCLOCK;
+	past <<= 6;
+	past -= pcm86.lastclock;
+	stepclock = pcm86.stepclock;
+	if (past >= stepclock) {
+		cnt = past / stepclock;
+		pcm86.lastclock += (cnt * stepclock);
+		past -= cnt * stepclock;
+		if (pcm86.fifo & 0x80) {
+			sound_sync();
+			RECALC_NOWCLKWAIT(cnt);
 		}
-		ret = ((past << 1) >= pcm86.stepclock)?1:0;
 	}
+	ret = ((past << 1) >= stepclock)?1:0;
 	if (pcm86.virbuf >= PCM86_LOGICALBUF) {			// バッファフル
 		ret |= 0x80;
 	}
@@ -147,6 +178,7 @@ static REG8 IOINPCALL pcm86_ia466(UINT p
 		ret |= 0x40;								// ちと変…
 	}
 	(void)port;
+//	TRACEOUT(("86pcm in %.4x %.2x", port, ret));
 	return(ret);
 }
 
@@ -182,12 +214,14 @@ static REG8 IOINPCALL pcm86_ia468(UINT p
 	}
 #endif
 	(void)port;
+//	TRACEOUT(("86pcm in %.4x %.2x", port, ret));
 	return(ret);
 }
 
 static REG8 IOINPCALL pcm86_ia46a(UINT port) {
 
 	(void)port;
+//	TRACEOUT(("86pcm in %.4x %.2x", port, pcm86.dactrl));
 	return(pcm86.dactrl);
 }