diff --git a/projects/examples/demos/piano.tal b/projects/examples/demos/piano.tal
index a6477ca..a052eb7 100644
--- a/projects/examples/demos/piano.tal
+++ b/projects/examples/demos/piano.tal
@@ -54,9 +54,6 @@
 	;on-mouse   .Mouse/vector DEO2
 	;on-message .Console/vector DEO2
 
-	#0160 .Screen/width DEO2
-	#0100 .Screen/height DEO2
-
 	( find center )
 	.Screen/width DEI2 2// .center/x STZ2
 	.Screen/height DEI2 2// .center/y STZ2
diff --git a/src/devices/ppu.c b/src/devices/ppu.c
index 4d1b7d6..b8dfcca 100644
--- a/src/devices/ppu.c
+++ b/src/devices/ppu.c
@@ -19,6 +19,18 @@ static Uint8 blending[5][16] = {
 	{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2},
 	{1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0}};
 
+static void
+ppu_clear(Ppu *p)
+{
+	int x, y;
+	for(y = 0; y < p->height; ++y) {
+		for(x = 0; x < p->width; ++x) {
+			ppu_pixel(p, p->bg, x, y, 0);
+			ppu_pixel(p, p->fg, x, y, 0);
+		}
+	}
+}
+
 void
 ppu_pixel(Ppu *p, Uint8 *layer, Uint16 x, Uint16 y, Uint8 color)
 {
@@ -78,15 +90,18 @@ ppu_init(Ppu *p, Uint8 hor, Uint8 ver)
 	p->height = 8 * ver;
 	p->bg = calloc(1, p->width / 4 * p->height * sizeof(Uint8));
 	p->fg = calloc(1, p->width / 4 * p->height * sizeof(Uint8));
+	ppu_clear(p);
 	return p->bg && p->fg;
 }
 
 int
 ppu_resize(Ppu *p, Uint8 hor, Uint8 ver)
 {
+	ppu_clear(p);
 	p->width = 8 * hor;
 	p->height = 8 * ver;
 	p->bg = realloc(p->bg, p->width / 4 * p->height * sizeof(Uint8));
 	p->fg = realloc(p->fg, p->width / 4 * p->height * sizeof(Uint8));
+	ppu_clear(p);
 	return p->bg && p->fg;
 }
\ No newline at end of file
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 887c3cb..d38d158 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -298,11 +298,6 @@ update_palette(Uint8 *addr)
 void
 set_size(Uint16 width, Uint16 height)
 {
-	int i;
-	/* clear */
-	for(i = 0; i < ppu.height * ppu.width; ++i)
-		ppu_screen[i] = palette[0];
-	/* resize */
 	ppu_resize(&ppu, width / 8, height / 8);
 	gRect.w = ppu.width;
 	gRect.h = ppu.height;