diff --git a/build.sh b/build.sh
index 44fabe9..b23fa0a 100755
--- a/build.sh
+++ b/build.sh
@@ -45,7 +45,8 @@ fi
 
 # bin/uxnasm etc/polycat.tal bin/polycat.rom
 # bin/uxn11 bin/polycat.rom
+# bin/uxnasm etc/friend.tal bin/friend.rom
 
-bin/uxnasm etc/friend.tal bin/friend.rom
-bin/uxn11 bin/friend.rom
+bin/uxnasm etc/mouse.tal bin/mouse.rom
+bin/uxn11 bin/mouse.rom
 
diff --git a/etc/mouse.tal b/etc/mouse.tal
new file mode 100644
index 0000000..45c3aca
--- /dev/null
+++ b/etc/mouse.tal
@@ -0,0 +1,227 @@
+( Mouse:
+	Paint with 3 colors with each mouse button. )
+
+|00 @System &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1
+|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
+|90 @Mouse &vector $2 &x $2 &y $2 &state $1 &pad $3 &modx $2 &mody $2
+
+|0000
+
+	@line &x2 $2 &y2 $2
+	@length $2
+	@frame $2
+	@pen &x $2 &y $2 &x2 $2 &y2 $2
+	@pointer &x $2 &y $2 &lastx $2 &lasty $2 &state $1
+
+|0100 ( -> )
+
+	( theme )
+	#4cfd .System/r DEO2
+	#4cf3 .System/g DEO2
+	#dcf2 .System/b DEO2
+
+	( vectors )
+	;on-mouse .Mouse/vector DEO2
+	;on-frame .Screen/vector DEO2
+
+	draw-mouse
+
+BRK
+
+(
+@|vectors )
+
+@on-frame ( -> )
+
+	.Mouse/state DEI ?&skip
+		;run DUP2 JSR2 JSR2
+		&skip
+
+BRK
+
+@on-mouse ( -> )
+
+	( clear last cursor )
+	.pointer/x LDZ2 .Screen/x DEO2
+	.pointer/y LDZ2 .Screen/y DEO2
+	[ LIT2 40 -Screen/sprite ] DEO
+	draw-mouse
+	( draw new cursor )
+	;pointer-icn .Screen/addr DEO2
+	#00 .Screen/auto DEO
+	.Mouse/x DEI2 DUP2 .pointer/x STZ2 .Screen/x DEO2
+	.Mouse/y DEI2 DUP2 .pointer/y STZ2 .Screen/y DEO2
+	#45 .Mouse/state DEI #00 NEQ #05 MUL ADD .Screen/sprite DEO
+	( on down )
+	.Mouse/state DEI #00 NEQ .pointer/state LDZ #00 EQU AND ?on-mouse-down
+	( on drag )
+	.Mouse/state DEI ?on-mouse-drag
+	.Mouse/state DEI .pointer/state STZ
+
+BRK
+
+@on-mouse-down ( -> )
+
+	#0000 DUP2 .length STZ2 .frame STZ2
+	clear-screen
+	( record start position )
+	.Mouse/x DEI2 DUP2 .pointer/x STZ2 .pointer/lastx STZ2
+	.Mouse/y DEI2 DUP2 .pointer/y STZ2 .pointer/lasty STZ2
+	.Mouse/state DEI .pointer/state STZ
+
+BRK
+
+@on-mouse-drag ( -> )
+
+	( record )
+	;stroke .length LDZ2 #20 SFT2 ADD2 STH2
+		.pointer/x LDZ2 .pointer/lastx LDZ2 SUB2 STH2kr STA2
+		.pointer/y LDZ2 .pointer/lasty LDZ2 SUB2 STH2r INC2 INC2 STA2
+	( move ptr )
+	.length LDZ2 INC2 .length STZ2
+	( draw line )
+	.pointer/lastx LDZ2
+	.pointer/lasty LDZ2
+	.pointer/x LDZ2
+	.pointer/y LDZ2
+		#01 draw-line
+	( record last position )
+	.Mouse/x DEI2
+		DUP2 .pointer/lastx STZ2
+		DUP2 .pen/x STZ2
+		.pen/x2 STZ2
+	.Mouse/y DEI2
+		DUP2 .pointer/lasty STZ2
+		DUP2 .pen/y STZ2
+		.pen/y2 STZ2
+	.Mouse/state DEI
+		DUP #01 NEQ INC ;run/color STA
+		.pointer/state STZ
+
+BRK
+
+(
+@|main )
+
+@run ( -- )
+
+	( read )
+	;stroke .frame LDZ2 #20 SFT2 ADD2 STH2
+		.pen/x LDZ2 STH2kr LDA2 ADD2 .pen/x STZ2
+		.pen/y LDZ2 STH2r INC2 INC2 LDA2 ADD2 .pen/y STZ2
+	( line )
+	.pen/x LDZ2 .pen/y LDZ2
+	.pen/x2 LDZ2 .pen/y2 LDZ2
+		.frame LDZ2 #01 SFT2 NIP #01 AND [ LIT &color $1 ] ADD INC draw-line
+	( history )
+	.pen/x LDZ2 .pen/x2 STZ2
+	.pen/y LDZ2 .pen/y2 STZ2
+	( incr frame )
+	.frame LDZ2 INC2 .length LDZ2 INC2 ( mod2 ) DIV2k MUL2 SUB2 .frame STZ2
+
+JMP2r
+
+@draw-mouse ( -- )
+
+	( clear )
+	#0010
+		DUP2 .Screen/x DEO2
+		.Screen/y DEO2
+	#16 .Screen/auto DEO
+	#40 .Screen/sprite DEOk DEO
+	( buttons )
+	#0300
+	&l
+		#01 OVR #40 SFT SFT .Mouse/state DEI AND #00 EQU ?&no-draw
+			#0010 .Screen/y DEO2
+			#00 OVR #40 SFT2 ;button-icn ADD2 .Screen/addr DEO2
+			#45 .Screen/sprite DEO
+			&no-draw
+		INC GTHk ?&l
+	POP2
+	( outline )
+	#0010 .Screen/y DEO2
+	;mouse-icn .Screen/addr DEO2
+	#16 .Screen/auto DEO
+	#4a .Screen/sprite DEOk DEO
+
+JMP2r
+
+@draw-line ( x1* y1* x2* y2* color -- )
+
+	( load )
+	,&color STR
+	,&y STR2
+	,&x STR2
+	.line/y2 STZ2
+	.line/x2 STZ2
+
+	,&x LDR2 .line/x2 LDZ2 SUB2 abs2 ,&dx STR2
+	#0000 ,&y LDR2 .line/y2 LDZ2 SUB2 abs2 SUB2 ,&dy STR2
+
+	#ffff #00 .line/x2 LDZ2 ,&x LDR2 lts2 DUP2 ADD2 ADD2 ,&sx STR2
+	#ffff #00 .line/y2 LDZ2 ,&y LDR2 lts2 DUP2 ADD2 ADD2 ,&sy STR2
+
+	[ LIT2 &dx $2 ] [ LIT2 &dy $2 ] ADD2 ,&e1 STR2
+
+	&loop
+		.line/x2 LDZ2 DUP2 .Screen/x DEO2 [ LIT2 &x $2 ] EQU2
+		.line/y2 LDZ2 DUP2 .Screen/y DEO2 [ LIT2 &y $2 ] EQU2
+			[ LIT2 &color $1 -Screen/pixel ] DEO
+			AND ?&end
+		[ LIT2 &e1 $2 ] DUP2 ADD2 DUP2
+		,&dy LDR2 lts2 ?&skipy
+			,&e1 LDR2 ,&dy LDR2 ADD2 ,&e1 STR2
+			.line/x2 LDZ2 [ LIT2 &sx $2 ] ADD2 .line/x2 STZ2
+		&skipy
+		,&dx LDR2 gts2 ?&skipx
+			,&e1 LDR2 ,&dx LDR2 ADD2 ,&e1 STR2
+			.line/y2 LDZ2 [ LIT2 &sy $2 ] ADD2 .line/y2 STZ2
+		&skipx
+		!&loop
+	&end
+
+JMP2r
+
+@abs2 DUP2 #0f SFT2 EQU #05 JCN #0000 SWP2 SUB2 JMP2r
+@lts2 #8000 STH2k ADD2 SWP2 STH2r ADD2 GTH2 JMP2r
+@gts2 #8000 STH2k ADD2 SWP2 STH2r ADD2 LTH2 JMP2r
+
+@clear-screen ( -- )
+
+	#00 .Screen/auto DEO
+
+	.Screen/height DEI2 #03 SFT2 NIP #00
+	&y
+		#00 OVR #30 SFT2 .Screen/y DEO2
+		.Screen/width DEI2 #03 SFT2 NIP #00
+		&x
+			#00 OVR #30 SFT2 .Screen/x DEO2
+			[ LIT2 00 -Screen/sprite ] DEO
+			INC GTHk ?&x
+		POP2
+		INC GTHk ?&y
+	POP2
+
+JMP2r
+
+@pointer-icn [
+	80c0 e0f0 f8e0 1000 ]
+@mouse-icn [
+	000d 1212 1212 121d
+	00b0 4848 4848 48b8
+	1010 1010 1008 0700
+	0808 0808 0810 e000 ]
+@button-icn [
+	000c 1e1e 1e1e 1e0c
+	0000 0000 0000 0000
+	0001 0303 0303 0301
+	0080 c0c0 c0c0 c080
+	0000 0000 0000 0000
+	0030 7878 7878 7830 ]
+
+(
+@|memory )
+
+@stroke
+
diff --git a/src/uxn11.c b/src/uxn11.c
index 9da7a71..e9d62ec 100644
--- a/src/uxn11.c
+++ b/src/uxn11.c
@@ -35,12 +35,18 @@ char *rom_path;
 
 #define WIDTH (64 * 8)
 #define HEIGHT (40 * 8)
-#define PAD 0
+#define PAD 2
 #define CONINBUFSIZE 256
 
 Uint16 deo_mask[] = {0xff28, 0x0300, 0xc028, 0x8000, 0x8000, 0x8000, 0x8000, 0x0000, 0x0000, 0x0000, 0xa260, 0xa260, 0x0000, 0x0000, 0x0000, 0x0000};
 Uint16 dei_mask[] = {0x0000, 0x0000, 0x003c, 0x0014, 0x0014, 0x0014, 0x0014, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x07ff, 0x0000, 0x0000, 0x0000};
 
+static int
+clamp(int val, int min, int max)
+{
+	return (val >= min) ? (val <= max) ? val : max : min;
+}
+
 Uint8
 uxn_dei(Uxn *u, Uint8 addr)
 {
@@ -118,7 +124,7 @@ emu_event(Uxn *u)
 	XNextEvent(display, &ev);
 	switch(ev.type) {
 	case Expose:
-		XPutImage(display, window, DefaultGC(display, 0), ximage, 0, 0, 0, 0, uxn_screen.width, uxn_screen.height);
+		XPutImage(display, window, DefaultGC(display, 0), ximage, 0, 0, PAD, PAD, uxn_screen.width, uxn_screen.height);
 		break;
 	case ClientMessage: {
 		XDestroyImage(ximage);
@@ -159,7 +165,9 @@ emu_event(Uxn *u)
 	} break;
 	case MotionNotify: {
 		XMotionEvent *e = (XMotionEvent *)&ev;
-		mouse_pos(u, &u->dev[0x90], (e->x - PAD) / SCALE, (e->y - PAD) / SCALE);
+		int x = clamp((e->x - PAD) / SCALE, 0, uxn_screen.width - 1);
+		int y = clamp((e->y - PAD) / SCALE, 0, uxn_screen.height - 1);
+		mouse_pos(u, &u->dev[0x90], x, y);
 	} break;
 	}
 }
@@ -233,7 +241,7 @@ main(int argc, char **argv)
 		if(uxn_screen.x2) {
 			int x1 = uxn_screen.x1, y1 = uxn_screen.y1, x2 = uxn_screen.x2, y2 = uxn_screen.y2;
 			screen_redraw();
-			XPutImage(display, window, DefaultGC(display, 0), ximage, x1, y1, x1, y1, x2 - x1, y2 - y1);
+			XPutImage(display, window, DefaultGC(display, 0), ximage, x1, y1, x1 + PAD, y1 + PAD, x2 - x1, y2 - y1);
 		}
 	}
 	XDestroyImage(ximage);