diff --git a/src/video/vid_ega.c b/src/video/vid_ega.c
index b740f11f0..b077d2d12 100644
--- a/src/video/vid_ega.c
+++ b/src/video/vid_ega.c
@@ -673,7 +673,7 @@ ega_doblit(int y1, int y2, int wx, int wy, ega_t *ega)
     if (ys_temp < 32)
 	ys_temp = 200;
 
-    if ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get()) {
+    if ((ega->crtc[0x17] & 0x80) && ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get())) {
 	/* Screen res has changed.. fix up, and let them know. */
 	xsize = xs_temp;
 	ysize = ys_temp;
diff --git a/src/video/vid_ega_render.c b/src/video/vid_ega_render.c
index 0ab9b5b3f..9ea2a7bd3 100644
--- a/src/video/vid_ega_render.c
+++ b/src/video/vid_ega_render.c
@@ -127,8 +127,12 @@ ega_render_text_40(ega_t *ega)
 
 	for (x = 0; x < (ega->hdisp + ega->scrollcache); x += xinc) {
 		drawcursor = ((ega->ma == ega->ca) && ega->con && ega->cursoron);
-		chr  = ega->vram[(ega->ma << 1) & ega->vrammask];
-		attr = ega->vram[((ega->ma << 1) + 1) & ega->vrammask];
+
+		if (ega->crtc[0x17] & 0x80) {
+			chr  = ega->vram[(ega->ma << 1) & ega->vrammask];
+			attr = ega->vram[((ega->ma << 1) + 1) & ega->vrammask];
+		} else
+			chr = attr = 0;
 
 		if (attr & 8)	charaddr = ega->charsetb + (chr * 128);
 		else		charaddr = ega->charseta + (chr * 128);
@@ -190,8 +194,12 @@ ega_render_text_80(ega_t *ega)
 
 	for (x = 0; x < (ega->hdisp + ega->scrollcache); x += xinc) {
 		drawcursor = ((ega->ma == ega->ca) && ega->con && ega->cursoron);
-		chr  = ega->vram[(ega->ma << 1) & ega->vrammask];
-		attr = ega->vram[((ega->ma << 1) + 1) & ega->vrammask];
+
+		if (ega->crtc[0x17] & 0x80) {
+			chr  = ega->vram[(ega->ma << 1) & ega->vrammask];
+			attr = ega->vram[((ega->ma << 1) + 1) & ega->vrammask];
+		} else
+			chr = attr = 0;
 
 		if (attr & 8)	charaddr = ega->charsetb + (chr * 128);
 		else		charaddr = ega->charseta + (chr * 128);
@@ -274,14 +282,17 @@ ega_render_2bpp_lowres(ega_t *ega)
 
 	ega->ma &= ega->vrammask;
 
-	p[0]  = p[1]  = ega->pallook[ega->egapal[(dat[0] >> 6) & 3]];
-	p[2]  = p[3]  = ega->pallook[ega->egapal[(dat[0] >> 4) & 3]];
-	p[4]  = p[5]  = ega->pallook[ega->egapal[(dat[0] >> 2) & 3]];
-	p[6]  = p[7]  = ega->pallook[ega->egapal[dat[0] & 3]];
-	p[8]  = p[9]  = ega->pallook[ega->egapal[(dat[1] >> 6) & 3]];
-	p[10] = p[11] = ega->pallook[ega->egapal[(dat[1] >> 4) & 3]];
-	p[12] = p[13] = ega->pallook[ega->egapal[(dat[1] >> 2) & 3]];
-	p[14] = p[15] = ega->pallook[ega->egapal[dat[1] & 3]];
+	if (ega->crtc[0x17] & 0x80) {
+		p[0]  = p[1]  = ega->pallook[ega->egapal[(dat[0] >> 6) & 3]];
+		p[2]  = p[3]  = ega->pallook[ega->egapal[(dat[0] >> 4) & 3]];
+		p[4]  = p[5]  = ega->pallook[ega->egapal[(dat[0] >> 2) & 3]];
+		p[6]  = p[7]  = ega->pallook[ega->egapal[dat[0] & 3]];
+		p[8]  = p[9]  = ega->pallook[ega->egapal[(dat[1] >> 6) & 3]];
+		p[10] = p[11] = ega->pallook[ega->egapal[(dat[1] >> 4) & 3]];
+		p[12] = p[13] = ega->pallook[ega->egapal[(dat[1] >> 2) & 3]];
+		p[14] = p[15] = ega->pallook[ega->egapal[dat[1] & 3]];
+	} else
+		memset(p, 0x00, 16 * sizeof(uint32_t));
 
 	p += 16;
     }
@@ -333,14 +344,17 @@ ega_render_2bpp_highres(ega_t *ega)
 
 	ega->ma &= ega->vrammask;
 
-	p[0]  = ega->pallook[ega->egapal[(dat[0] >> 6) & 3]];
-	p[1]  = ega->pallook[ega->egapal[(dat[0] >> 4) & 3]];
-	p[2]  = ega->pallook[ega->egapal[(dat[0] >> 2) & 3]];
-	p[3]  = ega->pallook[ega->egapal[dat[0] & 3]];
-	p[4]  = ega->pallook[ega->egapal[(dat[1] >> 6) & 3]];
-	p[5] = ega->pallook[ega->egapal[(dat[1] >> 4) & 3]];
-	p[6] = ega->pallook[ega->egapal[(dat[1] >> 2) & 3]];
-	p[7] = ega->pallook[ega->egapal[dat[1] & 3]];
+	if (ega->crtc[0x17] & 0x80) {
+		p[0]  = ega->pallook[ega->egapal[(dat[0] >> 6) & 3]];
+		p[1]  = ega->pallook[ega->egapal[(dat[0] >> 4) & 3]];
+		p[2]  = ega->pallook[ega->egapal[(dat[0] >> 2) & 3]];
+		p[3]  = ega->pallook[ega->egapal[dat[0] & 3]];
+		p[4]  = ega->pallook[ega->egapal[(dat[1] >> 6) & 3]];
+		p[5] = ega->pallook[ega->egapal[(dat[1] >> 4) & 3]];
+		p[6] = ega->pallook[ega->egapal[(dat[1] >> 2) & 3]];
+		p[7] = ega->pallook[ega->egapal[dat[1] & 3]];
+	} else
+		memset(p, 0x00, 8 * sizeof(uint32_t));
 
 	p += 8;
     }
@@ -402,18 +416,21 @@ ega_render_4bpp_lowres(ega_t *ega)
 
 	ega->ma &= ega->vrammask;
 
-	dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
-	p[0]  = p[1]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[2]  = p[3]  = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
-	p[4]  = p[5]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[6]  = p[7]  = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
-	p[8]  = p[9]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[10] = p[11] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
-	p[12] = p[13] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[14] = p[15] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+	if (ega->crtc[0x17] & 0x80) {
+		dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
+		p[0]  = p[1]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[2]  = p[3]  = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
+		p[4]  = p[5]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[6]  = p[7]  = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
+		p[8]  = p[9]  = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[10] = p[11] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
+		p[12] = p[13] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[14] = p[15] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+	} else
+		memset(p, 0x00, 16 * sizeof(uint32_t));
 
 	p += 16;
     }
@@ -470,18 +487,21 @@ ega_render_4bpp_highres(ega_t *ega)
 	}
 	ega->ma &= ega->vrammask;
 
-	dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
-	p[0] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[1] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
-	p[2] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[3] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
-	p[4] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[5] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
-	dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
-	p[6] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
-	p[7] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+	if (ega->crtc[0x17] & 0x80) {
+		dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
+		p[0] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[1] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
+		p[2] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[3] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
+		p[4] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[5] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+		dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
+		p[6] = ega->pallook[ega->egapal[(dat >> 4) & ega->plane_mask]];
+		p[7] = ega->pallook[ega->egapal[dat & ega->plane_mask]];
+	} else
+		memset(p, 0x00, 8 * sizeof(uint32_t));
 
 	p += 8;
     }
diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index aedaf58a9..3bec9dd24 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -1299,7 +1299,7 @@ svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
     if (ys_temp < 32)
 	ys_temp = 200;
 
-    if ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get()) {
+    if ((svga->crtc[0x17] & 0x80) && ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get())) {
 	/* Screen res has changed.. fix up, and let them know. */
 	xsize = xs_temp;
 	ysize = ys_temp;
diff --git a/src/video/vid_svga_render.c b/src/video/vid_svga_render.c
index c76bf2d72..00fa85ff9 100644
--- a/src/video/vid_svga_render.c
+++ b/src/video/vid_svga_render.c
@@ -120,8 +120,12 @@ svga_render_text_40(svga_t *svga)
 
 	for (x = 0; x < (svga->hdisp + svga->scrollcache); x += xinc) {
 		drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
-		chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
-		attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+
+		if (svga->crtc[0x17] & 0x80) {
+			chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
+			attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+		} else
+			chr = attr = 0;
 
 		if (attr & 8)	charaddr = svga->charsetb + (chr * 128);
 		else		charaddr = svga->charseta + (chr * 128);
@@ -183,8 +187,12 @@ svga_render_text_80(svga_t *svga)
 
 	for (x = 0; x < (svga->hdisp + svga->scrollcache); x += xinc) {
 		drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
-		chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
-		attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+
+		if (svga->crtc[0x17] & 0x80) {
+			chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
+			attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+		} else
+			chr = attr = 0;
 
 		if (attr & 8)	charaddr = svga->charsetb + (chr * 128);
 		else		charaddr = svga->charseta + (chr * 128);
@@ -248,7 +256,10 @@ svga_render_text_80_ksc5601(svga_t *svga)
 		drawcursor = ((svga->ma == svga->ca) && svga->con && svga->cursoron);
 		chr  = svga->vram[(svga->ma << 1) & svga->vram_display_mask];
 		nextchr = svga->vram[((svga->ma + 4) << 1) & svga->vram_display_mask];
-		attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+		if (svga->crtc[0x17] & 0x80)
+			attr = svga->vram[((svga->ma << 1) + 1) & svga->vram_display_mask];
+		else
+			attr = 0;
 
 		if (drawcursor) { 
 			bg = svga->pallook[svga->egapal[attr & 15]]; 
@@ -391,14 +402,17 @@ svga_render_2bpp_lowres(svga_t *svga)
 
 		svga->ma &= svga->vram_mask;
 
-		p[0]  = p[1]  = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
-		p[2]  = p[3]  = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
-		p[4]  = p[5]  = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
-		p[6]  = p[7]  = svga->pallook[svga->egapal[dat[0] & 3]];
-		p[8]  = p[9]  = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
-		p[10] = p[11] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
-		p[12] = p[13] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
-		p[14] = p[15] = svga->pallook[svga->egapal[dat[1] & 3]];
+		if (svga->crtc[0x17] & 0x80) {
+			p[0]  = p[1]  = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
+			p[2]  = p[3]  = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
+			p[4]  = p[5]  = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
+			p[6]  = p[7]  = svga->pallook[svga->egapal[dat[0] & 3]];
+			p[8]  = p[9]  = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
+			p[10] = p[11] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
+			p[12] = p[13] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
+			p[14] = p[15] = svga->pallook[svga->egapal[dat[1] & 3]];
+		} else
+			memset(p, 0x00, 16 * sizeof(uint32_t));
 
 		p += 16;
 	}
@@ -454,14 +468,17 @@ svga_render_2bpp_highres(svga_t *svga)
 
 		svga->ma &= svga->vram_mask;
 
-		p[0] = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
-		p[1] = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
-		p[2] = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
-		p[3] = svga->pallook[svga->egapal[dat[0] & 3]];
-		p[4] = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
-		p[5] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
-		p[6] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
-		p[7] = svga->pallook[svga->egapal[dat[1] & 3]];
+		if (svga->crtc[0x17] & 0x80) {
+			p[0] = svga->pallook[svga->egapal[(dat[0] >> 6) & 3]];
+			p[1] = svga->pallook[svga->egapal[(dat[0] >> 4) & 3]];
+			p[2] = svga->pallook[svga->egapal[(dat[0] >> 2) & 3]];
+			p[3] = svga->pallook[svga->egapal[dat[0] & 3]];
+			p[4] = svga->pallook[svga->egapal[(dat[1] >> 6) & 3]];
+			p[5] = svga->pallook[svga->egapal[(dat[1] >> 4) & 3]];
+			p[6] = svga->pallook[svga->egapal[(dat[1] >> 2) & 3]];
+			p[7] = svga->pallook[svga->egapal[dat[1] & 3]];
+		} else
+			memset(p, 0x00, 8 * sizeof(uint32_t));
 
 		p += 8;
 	}
@@ -521,18 +538,21 @@ svga_render_4bpp_lowres(svga_t *svga)
 		}
 		svga->ma &= svga->vram_mask;
 
-		dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
-		p[0]  = p[1]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[2]  = p[3]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
-		p[4]  = p[5]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[6]  = p[7]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
-		p[8]  = p[9]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[10] = p[11] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
-		p[12] = p[13] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[14] = p[15] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
+			p[0]  = p[1]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[2]  = p[3]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
+			p[4]  = p[5]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[6]  = p[7]  = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
+			p[8]  = p[9]  = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[10] = p[11] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
+			p[12] = p[13] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[14] = p[15] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+		} else
+			memset(p, 0x00, 16 * sizeof(uint32_t));
 
 		p += 16;
 	}
@@ -595,18 +615,21 @@ svga_render_4bpp_highres(svga_t *svga)
 		}
 		svga->ma &= svga->vram_mask;
 
-		dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
-		p[0] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[1] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
-		p[2] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[3] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
-		p[4] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[5] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
-		dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
-		p[6] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
-		p[7] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2);
+			p[0] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[1] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2);
+			p[2] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[3] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2);
+			p[4] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[5] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+			dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2);
+			p[6] = svga->pallook[svga->egapal[(dat >> 4) & svga->plane_mask]];
+			p[7] = svga->pallook[svga->egapal[dat & svga->plane_mask]];
+		} else
+			memset(p, 0x00, 8 * sizeof(uint32_t));
 
 		p += 8;
 	}
@@ -632,12 +655,14 @@ svga_render_8bpp_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 8) {
-		dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
-
-		p[0] = p[1] = svga->map8[dat & 0xff];
-		p[2] = p[3] = svga->map8[(dat >> 8) & 0xff];
-		p[4] = p[5] = svga->map8[(dat >> 16) & 0xff];
-		p[6] = p[7] = svga->map8[(dat >> 24) & 0xff];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
+			p[0] = p[1] = svga->map8[dat & 0xff];
+			p[2] = p[3] = svga->map8[(dat >> 8) & 0xff];
+			p[4] = p[5] = svga->map8[(dat >> 16) & 0xff];
+			p[6] = p[7] = svga->map8[(dat >> 24) & 0xff];
+		} else
+			memset(p, 0x00, 8 * sizeof(uint32_t));
 
 		svga->ma += 4;
 		p += 8;
@@ -665,17 +690,20 @@ svga_render_8bpp_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp/* + svga->scrollcache*/); x += 8) {
-		dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
-		p[0] = svga->map8[dat & 0xff];
-		p[1] = svga->map8[(dat >> 8) & 0xff];
-		p[2] = svga->map8[(dat >> 16) & 0xff];
-		p[3] = svga->map8[(dat >> 24) & 0xff];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
+			p[0] = svga->map8[dat & 0xff];
+			p[1] = svga->map8[(dat >> 8) & 0xff];
+			p[2] = svga->map8[(dat >> 16) & 0xff];
+			p[3] = svga->map8[(dat >> 24) & 0xff];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + 4) & svga->vram_display_mask]);
-		p[4] = svga->map8[dat & 0xff];
-		p[5] = svga->map8[(dat >> 8) & 0xff];
-		p[6] = svga->map8[(dat >> 16) & 0xff];
-		p[7] = svga->map8[(dat >> 24) & 0xff];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + 4) & svga->vram_display_mask]);
+			p[4] = svga->map8[dat & 0xff];
+			p[5] = svga->map8[(dat >> 8) & 0xff];
+			p[6] = svga->map8[(dat >> 16) & 0xff];
+			p[7] = svga->map8[(dat >> 24) & 0xff];
+		} else
+			memset(p, 0x00, 8 * sizeof(uint32_t));
 
 		svga->ma += 8;
 		p += 8;
@@ -703,17 +731,18 @@ svga_render_15bpp_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 4) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
 
-		p[(x << 1)]     = p[(x << 1) + 1] = video_15to32[dat & 0xffff];
+			p[(x << 1)]     = p[(x << 1) + 1] = video_15to32[dat & 0xffff];
+			p[(x << 1) + 2] = p[(x << 1) + 3] = video_15to32[dat >> 16];
 
-		p[(x << 1) + 2] = p[(x << 1) + 3] = video_15to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-
-		p[(x << 1) + 4] = p[(x << 1) + 5] = video_15to32[dat & 0xffff];
-
-		p[(x << 1) + 6] = p[(x << 1) + 7] = video_15to32[dat >> 16];
+			p[(x << 1) + 4] = p[(x << 1) + 5] = video_15to32[dat & 0xffff];
+			p[(x << 1) + 6] = p[(x << 1) + 7] = video_15to32[dat >> 16];
+		} else
+			memset(&(p[(x << 1)]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1;
 	svga->ma &= svga->vram_display_mask;
@@ -739,21 +768,24 @@ svga_render_15bpp_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 8) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
-		p[x]     = video_15to32[dat & 0xffff];
-		p[x + 1] = video_15to32[dat >> 16];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+			p[x]     = video_15to32[dat & 0xffff];
+			p[x + 1] = video_15to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-		p[x + 2] = video_15to32[dat & 0xffff];
-		p[x + 3] = video_15to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
+			p[x + 2] = video_15to32[dat & 0xffff];
+			p[x + 3] = video_15to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
-		p[x + 4] = video_15to32[dat & 0xffff];
-		p[x + 5] = video_15to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
+			p[x + 4] = video_15to32[dat & 0xffff];
+			p[x + 5] = video_15to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
-		p[x + 6] = video_15to32[dat & 0xffff];
-		p[x + 7] = video_15to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
+			p[x + 6] = video_15to32[dat & 0xffff];
+			p[x + 7] = video_15to32[dat >> 16];
+		} else
+			memset(&(p[x]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1; 
 	svga->ma &= svga->vram_display_mask;
@@ -779,17 +811,20 @@ svga_render_15bpp_mix_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 4) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
-		p[(x << 1)]     = p[(x << 1) + 1] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+			p[(x << 1)]     = p[(x << 1) + 1] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat >>= 16;
-		p[(x << 1) + 2] = p[(x << 1) + 3] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[(x << 1) + 2] = p[(x << 1) + 3] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-		p[(x << 1) + 4] = p[(x << 1) + 5] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
+			p[(x << 1) + 4] = p[(x << 1) + 5] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat >>= 16;
-		p[(x << 1) + 6] = p[(x << 1) + 7] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[(x << 1) + 6] = p[(x << 1) + 7] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+		} else
+			memset(&(p[(x << 1)]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1;
 	svga->ma &= svga->vram_display_mask;
@@ -815,25 +850,28 @@ svga_render_15bpp_mix_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 8) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
-		p[x]     = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
-		dat >>= 16;
-		p[x + 1] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+			p[x]     = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[x + 1] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-		p[x + 2] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
-		dat >>= 16;
-		p[x + 3] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
+			p[x + 2] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[x + 3] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
-		p[x + 4] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
-		dat >>= 16;
-		p[x + 5] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
+			p[x + 4] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[x + 5] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
-		p[x + 6] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
-		dat >>= 16;
-		p[x + 7] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
+			p[x + 6] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+			dat >>= 16;
+			p[x + 7] = (dat & 0x00008000) ? svga->pallook[dat & 0xff] : video_15to32[dat & 0xffff];
+		} else
+			memset(&(p[x]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1; 
 	svga->ma &= svga->vram_display_mask;
@@ -859,13 +897,16 @@ svga_render_16bpp_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 4) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
-		p[(x << 1)]     = p[(x << 1) + 1] = video_16to32[dat & 0xffff];
-		p[(x << 1) + 2] = p[(x << 1) + 3] = video_16to32[dat >> 16];
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+			p[(x << 1)]     = p[(x << 1) + 1] = video_16to32[dat & 0xffff];
+			p[(x << 1) + 2] = p[(x << 1) + 3] = video_16to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-		p[(x << 1) + 4] = p[(x << 1) + 5] = video_16to32[dat & 0xffff];
-		p[(x << 1) + 6] = p[(x << 1) + 7] = video_16to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
+			p[(x << 1) + 4] = p[(x << 1) + 5] = video_16to32[dat & 0xffff];
+			p[(x << 1) + 6] = p[(x << 1) + 7] = video_16to32[dat >> 16];
+		} else
+			memset(&(p[(x << 1)]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1; 
 	svga->ma &= svga->vram_display_mask;
@@ -890,21 +931,24 @@ svga_render_16bpp_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 8) {
-		uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
-		p[x]     = video_16to32[dat & 0xffff];
-		p[x + 1] = video_16to32[dat >> 16];
+		if (svga->crtc[0x17] & 0x80) {
+			uint32_t dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1)) & svga->vram_display_mask]);
+			p[x]     = video_16to32[dat & 0xffff];
+			p[x + 1] = video_16to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
-		p[x + 2] = video_16to32[dat & 0xffff];
-		p[x + 3] = video_16to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 4) & svga->vram_display_mask]);
+			p[x + 2] = video_16to32[dat & 0xffff];
+			p[x + 3] = video_16to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
-		p[x + 4] = video_16to32[dat & 0xffff];
-		p[x + 5] = video_16to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 8) & svga->vram_display_mask]);
+			p[x + 4] = video_16to32[dat & 0xffff];
+			p[x + 5] = video_16to32[dat >> 16];
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
-		p[x + 6] = video_16to32[dat & 0xffff];
-		p[x + 7] = video_16to32[dat >> 16];
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 1) + 12) & svga->vram_display_mask]);
+			p[x + 6] = video_16to32[dat & 0xffff];
+			p[x + 7] = video_16to32[dat >> 16];
+		} else
+			memset(&(p[x]), 0x00, 8 * sizeof(uint32_t));
 	}
 	svga->ma += x << 1; 
 	svga->ma &= svga->vram_display_mask;
@@ -927,7 +971,10 @@ svga_render_24bpp_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x++) {
-		fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
+		if (svga->crtc[0x17] & 0x80)
+			fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
+		else
+			fg = 0x00000000;
 		svga->ma += 3; 
 		svga->ma &= svga->vram_display_mask;
 		buffer32->line[svga->displine + svga->y_add][(x << 1) + svga->x_add] =
@@ -955,17 +1002,20 @@ svga_render_24bpp_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += 4) {
-		dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
-		p[x] = dat & 0xffffff;
+		if (svga->crtc[0x17] & 0x80) {
+			dat = *(uint32_t *)(&svga->vram[svga->ma & svga->vram_display_mask]);
+			p[x] = dat & 0xffffff;
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + 3) & svga->vram_display_mask]);
-		p[x + 1] = dat & 0xffffff;
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + 3) & svga->vram_display_mask]);
+			p[x + 1] = dat & 0xffffff;
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + 6) & svga->vram_display_mask]);
-		p[x + 2] = dat & 0xffffff;
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + 6) & svga->vram_display_mask]);
+			p[x + 2] = dat & 0xffffff;
 
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + 9) & svga->vram_display_mask]);
-		p[x + 3] = dat & 0xffffff;
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + 9) & svga->vram_display_mask]);
+			p[x + 3] = dat & 0xffffff;
+		} else
+			memset(&(p[x]), 0x0, 4 * sizeof(uint32_t));
 
 		svga->ma += 12;
 	}
@@ -989,8 +1039,11 @@ svga_render_32bpp_lowres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x++) {
-		fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
-		svga->ma += 4; 
+		if (svga->crtc[0x17] & 0x80)
+			fg = svga->vram[svga->ma] | (svga->vram[svga->ma + 1] << 8) | (svga->vram[svga->ma + 2] << 16);
+		else
+			fg = 0x00000000;
+		svga->ma += 4;
 		svga->ma &= svga->vram_display_mask;
 		buffer32->line[svga->displine + svga->y_add][(x << 1) + svga->x_add] =
 		buffer32->line[svga->displine + svga->y_add][(x << 1) + 1 + svga->x_add] = fg;
@@ -1017,7 +1070,10 @@ svga_render_32bpp_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x++) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		if (svga->crtc[0x17] & 0x80)
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		else
+			dat = 0x00000000;
 		p[x] = dat & 0xffffff;
 	}
 	svga->ma += 4; 
@@ -1044,7 +1100,10 @@ svga_render_ABGR8888_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x++) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		if (svga->crtc[0x17] & 0x80)
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		else
+			dat = 0x00000000;
 		p[x] = ((dat & 0xff0000) >> 16) | (dat & 0x00ff00) | ((dat & 0x0000ff) << 16);
 	}
 	svga->ma += 4; 
@@ -1071,7 +1130,10 @@ svga_render_RGBA8888_highres(svga_t *svga)
 	svga->lastline_draw = svga->displine;
 
 	for (x = 0; x <= (svga->hdisp + svga->scrollcache); x++) {
-		dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		if (svga->crtc[0x17] & 0x80)
+			dat = *(uint32_t *)(&svga->vram[(svga->ma + (x << 2)) & svga->vram_display_mask]);
+		else
+			dat = 0x00000000;
 		p[x] = dat >> 8;
 	}
 	svga->ma += 4;