--- np2/vram/dispsync.c	2003/10/16 17:58:15	1.1.1.1
+++ np2/vram/dispsync.c	2004/02/26 08:44:32	1.6
@@ -10,7 +10,7 @@
 	DSYNC	dsync;
 
 
-void dispsync_init(void) {
+void dispsync_initialize(void) {
 
 	ZeroMemory(&dsync, sizeof(dsync));
 	dsync.textymax = 400;
@@ -27,6 +27,20 @@ void dispsync_init(void) {
 
 BOOL dispsync_renewalmode(void) {
 
+	UINT	disp;
+
+	if (!scrnmng_haveextend()) {
+		return(FALSE);
+	}
+	disp = 0;
+	if ((!(np2cfg.LCD_MODE & 1)) && (gdc.display < 3)) {
+		disp = 1;
+	}
+	if (dsync.scrnxextend != disp) {
+		dsync.scrnxextend = disp;
+		scrnmng_setextend(disp);
+		return(1);
+	}
 	return(0);
 }
 
@@ -46,7 +60,8 @@ BOOL dispsync_renewalhorizontal(void) {
 	}
 	scrnxmax = cr + 2;
 	if ((scrnxpos + scrnxmax) > 80) {
-		scrnxmax = 80 - scrnxpos;
+		scrnxmax = min(scrnxmax, 80);
+		scrnxpos = 80 - scrnxmax;
 	}
 	scrnxpos <<= 3;
 	scrnxmax <<= 3;
@@ -81,26 +96,23 @@ BOOL dispsync_renewalvertical(void) {
 	}
 
 	textymax = LOADINTELWORD(gdc.m.para + GDC_SYNC + 6);
-	textymax &= 0x3ff;
-	if (textymax) {
-		textymax += text_vbp;
-		if (textymax > SURFACE_HEIGHT) {
-			textymax = SURFACE_HEIGHT;
-		}
-	}
-	else {
-		textymax = SURFACE_HEIGHT;
-	}
+	textymax = ((textymax - 1) & 0x3ff) + 1;
+	textymax += text_vbp;
 
 	grphymax = LOADINTELWORD(gdc.s.para + GDC_SYNC + 6);
-	grphymax &= 0x3ff;
-	if (grphymax) {
-		grphymax += grph_vbp;
-		if (grphymax > SURFACE_HEIGHT) {
-			grphymax = SURFACE_HEIGHT;
-		}
+	grphymax = ((grphymax - 1) & 0x3ff) + 1;
+	grphymax += grph_vbp;
+
+#if defined(SUPPORT_CRT15KHZ)
+	if (gdc.crt15khz & 2) {
+		textymax *= 2;
+		grphymax *= 2;
 	}
-	else {
+#endif
+	if (textymax > SURFACE_HEIGHT) {
+		textymax = SURFACE_HEIGHT;
+	}
+	if (grphymax > SURFACE_HEIGHT) {
 		grphymax = SURFACE_HEIGHT;
 	}
 	if ((dsync.text_vbp == text_vbp) && (dsync.grph_vbp == grph_vbp) &&