--- np2/io/crtc.c	2003/10/21 11:22:05	1.2
+++ np2/io/crtc.c	2004/03/19 00:30:01	1.6
@@ -7,20 +7,20 @@
 
 // ---- I/O
 
-static void IOOUTCALL crtc_o70(UINT port, BYTE dat) {
+static void IOOUTCALL crtc_o70(UINT port, REG8 dat) {
 
 	port = (port & 0x0e) >> 1;
 	dat &= 0x1f;
 	if (crtc.b[port] != dat) {
-		crtc.b[port] = dat;
+		crtc.b[port] = (UINT8)dat;
 		gdcs.textdisp |= GDCSCRN_ALLDRAW;
 	}
 }
 
-static void IOOUTCALL crtc_o7c(UINT port, BYTE dat) {
+static void IOOUTCALL crtc_o7c(UINT port, REG8 dat) {
 
 	if (grcg.chip) {
-		grcg.modereg = dat;
+		grcg.modereg = (UINT8)dat;
 		grcg.counter = 0;
 		vramop.operate &= VOP_GRCGMASK;
 		vramop.operate |= ((dat & 0xc0) >> 4);
@@ -32,18 +32,18 @@ static void IOOUTCALL crtc_o7c(UINT port
 	(void)port;
 }
 
-static void IOOUTCALL crtc_o7e(UINT port, BYTE dat) {
+static void IOOUTCALL crtc_o7e(UINT port, REG8 dat) {
 
 	int		cnt;
 
 	cnt = grcg.counter;
-	grcg.tile[cnt].b[0] = dat;
-	grcg.tile[cnt].b[1] = dat;
+	grcg.tile[cnt].b[0] = (UINT8)dat;
+	grcg.tile[cnt].b[1] = (UINT8)dat;
 	grcg.counter = (cnt + 1) & 3;
 	(void)port;
 }
 
-static BYTE IOINPCALL crtc_i7c(UINT port) {
+static REG8 IOINPCALL crtc_i7c(UINT port) {
 
 	(void)port;
 	return(grcg.modereg);
@@ -60,14 +60,34 @@ static const IOINP crtci70[8] = {
 				NULL,		NULL,		NULL,		NULL,
 				NULL,		NULL,		crtc_i7c,	NULL};
 
+
+void crtc_biosreset(void) {
+
+	if (!(np2cfg.dipsw[0] & 0x01)) {
+		crtc.reg.pl = 0;
+		crtc.reg.bl = 0x0f;
+		crtc.reg.cl = 0x10;
+		crtc.reg.ssl = 0;
+	}
+	else {
+		crtc.reg.pl = 0;
+		crtc.reg.bl = 0x07;
+		crtc.reg.cl = 0x08;
+		crtc.reg.ssl = 0;
+	}
+	gdcs.textdisp |= GDCSCRN_ALLDRAW;
+}
+
 void crtc_reset(void) {
 
 	ZeroMemory(&grcg, sizeof(grcg));
 	ZeroMemory(&crtc, sizeof(crtc));
-	crtc.reg.pl = 0x00;
-	crtc.reg.bl = 0x0f;
-	crtc.reg.cl = 0x10;
+#if defined(SUPPORT_PC9821)
+	grcg.chip = 3;							// PC-9821は EGC必須
+#else
 	grcg.chip = np2cfg.grcg & 3;			// GRCG動作のコピー
+#endif
+	crtc_biosreset();
 }
 
 void crtc_bind(void) {