diff --git a/build.sh b/build.sh
index 75e5f41..a6e2477 100755
--- a/build.sh
+++ b/build.sh
@@ -28,7 +28,7 @@ else
 fi
 
 echo "Assembling.."
-./bin/assembler projects/software/nasu.usm bin/boot.rom
+./bin/assembler projects/software/left.usm bin/boot.rom
 
 echo "Running.."
 if [ "${2}" = '--cli' ]; 
diff --git a/projects/software/left.usm b/projects/software/left.usm
index ae702ff..aa7bbf8 100644
--- a/projects/software/left.usm
+++ b/projects/software/left.usm
@@ -42,24 +42,21 @@
 
 ( devices )
 
-|0100 ;Console { pad 8 char 1 byte 1 short 2 }
-|0110 ;Screen { width 2 height 2 pad 4 x 2 y 2 color 1 }
-|0120 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
-|0130 ;Controller { buttons 1 }
-|0140 ;Keys { key 1 }
-|0150 ;Mouse { x 2 y 2 state 1 chord 1 }
-|0160 ;File { pad 8 name 2 length 2 load 2 save 2 }
-|01F0 ;System { pad 8 r 2 g 2 b 2 }
-
-|0200 ^RESET JMP
-|0204 ,ERROR JMP2
-|0208 ,FRAME JMP2
+|0100 ;System { vector 2 pad 6 r 2 g 2 b 2 }
+|0110 ;Console { pad 8 char 1 byte 1 short 2 }
+|0120 ;Screen { vector 2 width 2 height 2 pad 2 x 2 y 2 color 1 }
+|0130 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
+|0140 ;Controller { buttons 1 }
+|0150 ;Keys { key 1 }
+|0160 ;Mouse { x 2 y 2 state 1 chord 1 }
+|0170 ;File { pad 8 name 2 length 2 load 2 save 2 }
 
 ( program )
 
-@RESET
+|0200 @RESET
 	
 	( theme ) #e0fa =System.r #30fa =System.g #30fa =System.b
+	( vectors ) ,FRAME =Screen.vector
 
 	( load file )
 	,filepath ,load-file JSR2
diff --git a/projects/software/nasu.usm b/projects/software/nasu.usm
index 290f43d..2aca4cd 100644
--- a/projects/software/nasu.usm
+++ b/projects/software/nasu.usm
@@ -31,24 +31,23 @@
 
 ( devices )
 
-|0110 ;Screen { width 2 height 2 pad 4 x 2 y 2 color 1 }
-|0120 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
-|0130 ;Controller { buttons 1 }
-|0140 ;Keys { key 1 }
-|0150 ;Mouse { x 2 y 2 state 1 chord 1 change 1 }
-|0160 ;File { pad 8 name 2 length 2 load 2 save 2 }
-|01F0 ;System { pad 8 r 2 g 2 b 2 }
-
-|0200 ^RESET JMP
-|0204 ,ERROR JMP2
-|0208 ,FRAME JMP2
+|0100 ;System { vector 2 pad 6 r 2 g 2 b 2 }
+|0110 ;Console { pad 8 char 1 byte 1 short 2 }
+|0120 ;Screen { vector 2 width 2 height 2 pad 2 x 2 y 2 color 1 }
+|0130 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
+|0140 ;Controller { buttons 1 }
+|0150 ;Keys { key 1 }
+|0160 ;Mouse { x 2 y 2 state 1 chord 1 change 1 }
+|0170 ;File { pad 8 name 2 length 2 load 2 save 2 }
 
 ( program )
 
-@RESET
+|0200 @RESET
 
 	( theme ) #e0fc =System.r #30cc =System.g #30ac =System.b
 
+	,FRAME =Screen.vector
+
 	~Screen.width 2/ #008a SUB2 =bankview.x 
 	~Screen.height 2/ #003f SUB2 =bankview.y 
 	,bank =bankview.addr
diff --git a/projects/software/neralie.usm b/projects/software/neralie.usm
index 16676c7..4a9b848 100644
--- a/projects/software/neralie.usm
+++ b/projects/software/neralie.usm
@@ -11,18 +11,18 @@
 ;neralie { n0123 2 n4 1 n5 1 n6 1 n7 1 n8 1 n9 1 color 1 x 2 y 2 w 2 h 2 }
 ;mul { ahi 1 alo 1 bhi 1 blo 1 }
 
-|0100 ;Console { pad 8 char 1 byte 1 short 2 }
-|0110 ;Screen { width 2 height 2 pad 4 x 2 y 2 color 1 }
-|0120 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
-|0190 ;DateTime { year 2 month 1 day 1 hour 1 minute 1 second 1 dow 1 doy 2 isdst 1 pad 4 get 1 }
-|01F0 ;System { pad 8 r 2 g 2 b 2 }
+|0100 ;System { vector 2 pad 6 r 2 g 2 b 2 }
+|0110 ;Console { pad 8 char 1 byte 1 short 2 }
+|0120 ;Screen { vector 2 width 2 height 2 pad 2 x 2 y 2 color 1 }
+|0130 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
+|01a0 ;DateTime { year 2 month 1 day 1 hour 1 minute 1 second 1 dow 1 doy 2 isdst 1 pad 4 get 1 }
 
-|0200 ^RESET JMP
-|0204 ,ERROR JMP2
-|0208 ,FRAME JMP2
+( program )
+
+|0200 @RESET
 
-@RESET
 	( theme ) #03fd =System.r #0ef3 =System.g #0bf2 =System.b
+	( vectors ) ,FRAME =Screen.vector
 	#01 =fps.current
 
 	#000c
diff --git a/projects/software/noodle.usm b/projects/software/noodle.usm
index 1b03142..da59ba6 100644
--- a/projects/software/noodle.usm
+++ b/projects/software/noodle.usm
@@ -51,25 +51,23 @@
 
 ( devices )
 
-|0100 ;Console { pad 8 char 1 byte 1 short 2 string 2 }
-|0110 ;Screen { width 2 height 2 pad 4 x 2 y 2 color 1 }
-|0120 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
-|0130 ;Controller { p1 1 }
-|0140 ;Keys { key 1 }
-|0150 ;Mouse { x 2 y 2 state 1 chord 1 }
-|0160 ;File { pad 8 name 2 length 2 load 2 save 2 }
-|01F0 ;System { pad 8 r 2 g 2 b 2 }
-|0200 ^RESET JMP
-|0204 ,ERROR JMP2
-|0208 ,FRAME JMP2
+|0100 ;System { vector 2 pad 6 r 2 g 2 b 2 }
+|0110 ;Console { pad 8 char 1 byte 1 short 2 }
+|0120 ;Screen { vector 2 width 2 height 2 pad 2 x 2 y 2 color 1 }
+|0130 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
+|0140 ;Controller { p1 1 }
+|0150 ;Keys { key 1 }
+|0160 ;Mouse { x 2 y 2 state 1 chord 1 }
+|0170 ;File { pad 8 name 2 length 2 load 2 save 2 }
 
 ( program )
 
-@RESET ( -- )
+|0200 @RESET
 	
 	( theme ) 
 	#e0fa =theme.r0 #30fa =theme.g0 #30fa =theme.b0 ( normal mode )
 	#00fe =theme.r1 #00f3 =theme.g1 #00f3 =theme.b1 ( presentation mode )
+	( vectors ) ,FRAME =Screen.vector
 
 	~theme.r0 =System.r ~theme.g0 =System.g ~theme.b0 =System.b
 
diff --git a/src/emulator.c b/src/emulator.c
index 36e5883..dd34cec 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -80,7 +80,7 @@ static SDL_Renderer *gRenderer;
 static SDL_Texture *gTexture;
 static SDL_AudioDeviceID audio_id;
 static Screen screen;
-static Device *devscreen, *devmouse, *devkey, *devctrl, *devaudio;
+static Device *devsystem, *devscreen, *devmouse, *devkey, *devctrl, *devaudio;
 
 #pragma mark - Helpers
 
@@ -582,7 +582,7 @@ ppnil(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
 int
 start(Uxn *u)
 {
-	evaluxn(u, PAGE_VECTORS);
+	inituxn(u, 0x0200);
 	redraw(pixels, u);
 	while(1) {
 		SDL_Event event;
@@ -602,12 +602,13 @@ start(Uxn *u)
 				break;
 			}
 		}
-		evaluxn(u, PAGE_VECTORS + 0x08);
+		evaluxn(u, devscreen->vector);
 		if(screen.reqdraw)
 			redraw(pixels, u);
 		elapsed = (SDL_GetPerformanceCounter() - start) / (double)SDL_GetPerformanceFrequency() * 1000.0f;
 		SDL_Delay(clamp(16.666f - elapsed, 0, 1000));
 	}
+	return 1;
 }
 
 int
@@ -624,28 +625,28 @@ main(int argc, char **argv)
 	if(!init())
 		return error("Init", "Failed");
 
-	portuxn(&u, 0x00, "console", console_poke);
-	devscreen = portuxn(&u, 0x01, "screen", screen_poke);
-	portuxn(&u, 0x02, "sprite", sprite_poke);
-	devctrl = portuxn(&u, 0x03, "controller", ppnil);
-	devkey = portuxn(&u, 0x04, "key", ppnil);
-	devmouse = portuxn(&u, 0x05, "mouse", ppnil);
-	portuxn(&u, 0x06, "file", file_poke);
-	devaudio = portuxn(&u, 0x07, "audio", audio_poke);
-	portuxn(&u, 0x08, "midi", ppnil);
-	portuxn(&u, 0x09, "datetime", datetime_poke);
-	portuxn(&u, 0x0a, "---", ppnil);
+	devsystem = portuxn(&u, 0x00, "system", system_poke);
+	portuxn(&u, 0x01, "console", console_poke);
+	devscreen = portuxn(&u, 0x02, "screen", screen_poke);
+	portuxn(&u, 0x03, "sprite", sprite_poke);
+	devctrl = portuxn(&u, 0x04, "controller", ppnil);
+	devkey = portuxn(&u, 0x05, "key", ppnil);
+	devmouse = portuxn(&u, 0x06, "mouse", ppnil);
+	portuxn(&u, 0x07, "file", file_poke);
+	devaudio = portuxn(&u, 0x08, "audio", audio_poke);
+	portuxn(&u, 0x09, "midi", ppnil);
+	portuxn(&u, 0x0a, "datetime", datetime_poke);
 	portuxn(&u, 0x0b, "---", ppnil);
 	portuxn(&u, 0x0c, "---", ppnil);
 	portuxn(&u, 0x0d, "---", ppnil);
 	portuxn(&u, 0x0e, "---", ppnil);
-	portuxn(&u, 0x0f, "system", system_poke);
+	portuxn(&u, 0x0f, "---", ppnil);
 
 	/* Write screen size to dev/screen */
-	u.ram.dat[devscreen->addr + 0] = (HOR * 8 >> 8) & 0xff;
-	u.ram.dat[devscreen->addr + 1] = HOR * 8 & 0xff;
-	u.ram.dat[devscreen->addr + 2] = (VER * 8 >> 8) & 0xff;
-	u.ram.dat[devscreen->addr + 3] = VER * 8 & 0xff;
+	u.ram.dat[devscreen->addr + 2] = (HOR * 8 >> 8) & 0xff;
+	u.ram.dat[devscreen->addr + 3] = HOR * 8 & 0xff;
+	u.ram.dat[devscreen->addr + 4] = (VER * 8 >> 8) & 0xff;
+	u.ram.dat[devscreen->addr + 5] = VER * 8 & 0xff;
 
 	start(&u);
 	quit();
diff --git a/src/uxn.c b/src/uxn.c
index 53d0d22..1101f49 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -151,6 +151,17 @@ evaluxn(Uxn *u, Uint16 vec)
 	return 1;
 }
 
+int
+inituxn(Uxn *u, Uint16 vec)
+{
+	Uint8 i = 0;
+	if(!evaluxn(u, vec))
+		return 0;
+	for(i = 0; i < 0x10; ++i)
+		u->dev[i].vector = mempeek16(u, u->dev[i].addr);
+	return 1;
+}
+
 int
 bootuxn(Uxn *u)
 {
@@ -178,6 +189,6 @@ portuxn(Uxn *u, Uint8 id, char *name, Uint8 (*pofn)(Uxn *u, Uint16 ptr, Uint8 b0
 	Device *d = &u->dev[id];
 	d->addr = PAGE_DEVICE + id * 0x10;
 	d->poke = pofn;
-	printf("Device #%d: %s, at 0x%04x \n", id, name, d->addr);
+	printf("Device added #%d: %s, at 0x%04x \n", id, name, d->addr);
 	return d;
 }
diff --git a/src/uxn.h b/src/uxn.h
index 7cd3a53..91d6ffc 100644
--- a/src/uxn.h
+++ b/src/uxn.h
@@ -32,7 +32,7 @@ typedef struct {
 struct Uxn;
 
 typedef struct Device {
-	Uint16 addr;
+	Uint16 addr, vector;
 	Uint8 (*poke)(struct Uxn *, Uint16, Uint8, Uint8);
 } Device;
 
@@ -44,5 +44,6 @@ typedef struct Uxn {
 
 int loaduxn(Uxn *c, char *filepath);
 int bootuxn(Uxn *c);
+int inituxn(Uxn *u, Uint16 vec);
 int evaluxn(Uxn *u, Uint16 vec);
 Device *portuxn(Uxn *u, Uint8 id, char *name, Uint8 (*pofn)(Uxn *, Uint16, Uint8, Uint8));