diff --git a/build.sh b/build.sh
index f3cb731..8a582c4 100755
--- a/build.sh
+++ b/build.sh
@@ -32,7 +32,7 @@ else
 fi
 
 echo "Assembling.."
-./bin/assembler projects/examples/devices/console.lib.usm bin/boot.rom
+./bin/assembler projects/examples/devices/screen.usm bin/boot.rom
 
 echo "Running.."
 if [ "${2}" = '--cli' ]; 
diff --git a/projects/examples/devices/console.lib.usm b/projects/examples/devices/console.lib.usm
index 84e4947..9ba7993 100644
--- a/projects/examples/devices/console.lib.usm
+++ b/projects/examples/devices/console.lib.usm
@@ -18,10 +18,10 @@
 
 |0100 ( -> )
 		
-	[ ;char-txt PRINT   ] #42 .Console/char DEO BR
-	[ ;byte-txt PRINT   ] #ab .Console/byte DEO BR
-	[ ;short-txt PRINT  ] #cdef .Console/short DEO2 BR
-	[ ;string-txt PRINT ] ;hello-word .Console/string DEO2 BR
+	;char-txt PRINT #42 .Console/char DEO BR
+	;byte-txt PRINT #ab .Console/byte DEO BR
+	;short-txt PRINT #cdef .Console/short DEO2 BR
+	;string-txt PRINT ;hello-word .Console/string DEO2 BR
 
 	;hello-word ;print JSR2
 	#ffff ;print-hexadecimal JSR2
diff --git a/projects/examples/devices/screen.usm b/projects/examples/devices/screen.usm
new file mode 100644
index 0000000..f4fead7
--- /dev/null
+++ b/projects/examples/devices/screen.usm
@@ -0,0 +1,112 @@
+( dev/screen )
+
+%RTN { JMP2r }
+
+( devices )
+
+|00 @System     [ &vector $2 &pad      $6 &r      $2 &g     $2 &b      $2 ]
+|20 @Screen     [ &vector $2 &width    $2 &height $2 &pad   $2 &x      $2 &y     $2 &addr $2 &color $1 ]
+
+( variables )
+
+|0000
+
+@center [ &x $2 &y $2 ]
+
+( init )
+
+|0100 ( -> )
+	
+	( theme ) 
+	#530f .System/r DEO2
+	#f20f .System/g DEO2 
+	#ad0f .System/b DEO2 
+
+	( find screen center )
+	.Screen/width DEI2 #0002 DIV2 .center/x POK2
+	.Screen/height DEI2 #0002 DIV2 .center/y POK2
+
+	( draw )
+	;draw-background JSR2
+	;draw-sprites JSR2
+	
+BRK
+
+@draw-background ( -- )
+	
+	( draw hor line )
+	#0000 .Screen/x DEO2 .center/y PEK2 .Screen/y DEO2
+	#0000 .Screen/width DEI2 ( from/to )
+	&draw-hor
+		( draw ) #01 .Screen/color DEO
+		( incr ) SWP2 #0002 ADD2 DUP2 .Screen/x DEO2 SWP2
+		OVR2 OVR2 LTH2 ,&draw-hor JNZ
+	POP2 POP2
+
+	( draw ver line )
+	.center/x PEK2 .Screen/x DEO2 #0000 .Screen/y DEO2
+	#0000 .Screen/height DEI2 ( from/to )
+	&draw-ver
+		( draw ) #02 .Screen/color DEO
+		( incr ) SWP2 #0002 ADD2 DUP2 .Screen/y DEO2 SWP2
+		OVR2 OVR2 LTH2 ,&draw-ver JNZ
+	POP2 POP2
+
+RTN
+
+@draw-sprites ( -- )
+	
+	( draw blending modes )
+	;preview_icn .Screen/addr DEO2
+	#0010 .Screen/y DEO2
+	#00 #08
+	&draw-pixel1
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-pixel1 JNZ
+	POP POP
+	#0018 .Screen/y DEO2
+	#00 #08
+	&draw-pixel2
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR #08 ADD .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-pixel2 JNZ
+	POP POP
+	#0020 .Screen/y DEO2
+	#00 #08
+	&draw-icn1
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR #20 ADD .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-icn1 JNZ
+	POP POP
+	#0028 .Screen/y DEO2
+	#00 #08
+	&draw-icn2
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR #28 ADD .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-icn2 JNZ
+	POP POP
+	#0030 .Screen/y DEO2
+	#00 #08
+	&draw-chr1
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR #40 ADD .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-chr1 JNZ
+	POP POP
+	#0038 .Screen/y DEO2
+	#00 #08
+	&draw-chr2
+		( move ) OVR #00 SWP #0008 MUL2 #0010 ADD2 .Screen/x DEO2
+		( draw ) OVR #48 ADD .Screen/color DEO
+		( incr ) SWP #01 ADD SWP
+		DUP2 LTH ,&draw-chr2 JNZ
+	POP POP
+
+RTN
+
+@preview_icn  [ 183c 66db db66 3c18 0000 183c 3c18 0000 ]
\ No newline at end of file
diff --git a/src/debugger.c b/src/debugger.c
index bf4efe8..40785a1 100644
--- a/src/debugger.c
+++ b/src/debugger.c
@@ -38,23 +38,23 @@ printstack(Stack *s)
 #pragma mark - Devices
 
 void
-console_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+console_talk(Device *d, Uint8 b0, Uint8 w)
 {
+	if(!w) return;
 	switch(b0) {
-	case 0x08: printf("%c", b1); break;
-	case 0x09: printf("0x%02x\n", b1); break;
-	case 0x0b: printf("0x%04x\n", (d->dat[0x0a] << 8) + b1); break;
+	case 0x8: printf("%c", d->dat[0x8]); break;
+	case 0x9: printf("0x%02x", d->dat[0x9]); break;
+	case 0xb: printf("0x%04x", mempeek16(d->dat, 0xa)); break;
+	case 0xd: printf("%s", &d->mem[mempeek16(d->dat, 0xc)]); break;
 	}
 	fflush(stdout);
-	(void)d;
-	(void)b0;
 }
 
 void
-file_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+file_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	Uint8 read = b0 == 0xd;
-	if(read || b0 == 0xf) {
+	if(w && (read || b0 == 0xf)) {
 		char *name = (char *)&d->mem[mempeek16(d->dat, 0x8)];
 		Uint16 result = 0, length = mempeek16(d->dat, 0xa);
 		Uint16 offset = mempeek16(d->dat, 0x4);
@@ -67,15 +67,14 @@ file_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
 		}
 		mempoke16(d->dat, 0x2, result);
 	}
-	(void)b1;
 }
 
 void
-nil_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+nil_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	(void)d;
 	(void)b0;
-	(void)b1;
+	(void)w;
 }
 
 #pragma mark - Generics
diff --git a/src/emulator.c b/src/emulator.c
index 3c7bbd5..af77e23 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -182,17 +182,18 @@ doctrl(Uxn *u, SDL_Event *event, int z)
 #pragma mark - Devices
 
 void
-system_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+system_talk(Device *d, Uint8 b0, Uint8 w)
 {
+	if(!w) return;
 	putcolors(&ppu, &d->dat[0x8]);
 	reqdraw = 1;
 	(void)b0;
-	(void)b1;
 }
 
 void
-console_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+console_talk(Device *d, Uint8 b0, Uint8 w)
 {
+	if(!w) return;
 	switch(b0) {
 	case 0x8: printf("%c", d->dat[0x8]); break;
 	case 0x9: printf("0x%02x", d->dat[0x9]); break;
@@ -203,27 +204,27 @@ console_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
 }
 
 void
-screen_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+screen_talk(Device *d, Uint8 b0, Uint8 w)
 {
-	if(b0 == 0xe) {
+	if(w && b0 == 0xe) {
 		Uint16 x = mempeek16(d->dat, 0x8);
 		Uint16 y = mempeek16(d->dat, 0xa);
 		Uint8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
-		Uint8 *layer = b1 >> 4 & 0x1 ? ppu.fg : ppu.bg;
-		switch(b1 >> 5) {
-		case 0: putpixel(&ppu, layer, x, y, b1 & 0x3); break;
-		case 1: puticn(&ppu, layer, x, y, addr, b1 & 0xf); break;
-		case 2: putchr(&ppu, layer, x, y, addr, b1 & 0xf); break;
+		Uint8 *layer = d->dat[0xe] >> 4 & 0x1 ? ppu.fg : ppu.bg;
+		switch(d->dat[0xe] >> 5) {
+		case 0: putpixel(&ppu, layer, x, y, d->dat[0xe] & 0x3); break;
+		case 1: puticn(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf); break;
+		case 2: putchr(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf); break;
 		}
 		reqdraw = 1;
 	}
 }
 
 void
-file_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+file_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	Uint8 read = b0 == 0xd;
-	if(read || b0 == 0xf) {
+	if(w && (read || b0 == 0xf)) {
 		char *name = (char *)&d->mem[mempeek16(d->dat, 0x8)];
 		Uint16 result = 0, length = mempeek16(d->dat, 0xa);
 		Uint16 offset = mempeek16(d->dat, 0x4);
@@ -236,17 +237,16 @@ file_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
 		}
 		mempoke16(d->dat, 0x2, result);
 	}
-	(void)b1;
 }
 
 static void
-audio_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+audio_talk(Device *d, Uint8 b0, Uint8 w)
 {
-	if(b0 == 0xa) {
-		if(b1 >= apu.n_notes) apu.notes = SDL_realloc(apu.notes, (b1 + 1) * sizeof(Note));
-		while(b1 >= apu.n_notes) SDL_zero(apu.notes[apu.n_notes++]);
-		apu_play_note(&apu.notes[b1], mempeek16(d->dat, 0x0), mempeek16(d->dat, 0x2), d->dat[0x8], d->dat[0x9] & 0x7f, d->dat[0x9] > 0x7f);
-	} else if(b0 == 0xe && apu.queue != NULL) {
+	if(w && b0 == 0xa) {
+		if(d->dat[0xa] >= apu.n_notes) apu.notes = SDL_realloc(apu.notes, (d->dat[0xa] + 1) * sizeof(Note));
+		while(d->dat[0xa] >= apu.n_notes) SDL_zero(apu.notes[apu.n_notes++]);
+		apu_play_note(&apu.notes[d->dat[0xa]], mempeek16(d->dat, 0x0), mempeek16(d->dat, 0x2), d->dat[0x8], d->dat[0x9] & 0x7f, d->dat[0x9] > 0x7f);
+	} else if(w && b0 == 0xe && apu.queue != NULL) {
 		if(apu.queue->n == apu.queue->sz) {
 			apu.queue->sz = apu.queue->sz < 4 ? 4 : apu.queue->sz * 2;
 			apu.queue->dat = SDL_realloc(apu.queue->dat, apu.queue->sz * sizeof(*apu.queue->dat));
@@ -256,12 +256,12 @@ audio_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
 		else
 			apu.queue->dat[apu.queue->n++] = mempeek16(d->dat, 0xb) + 0x8000;
 		apu.queue->dat[apu.queue->n++] = mempeek16(d->dat, 0xd);
-	} else if(b0 == 0xf && apu.queue != NULL)
+	} else if(w && b0 == 0xf && apu.queue != NULL)
 		apu.queue->finishes = 1;
 }
 
 void
-datetime_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+datetime_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	time_t seconds = time(NULL);
 	struct tm *t = localtime(&seconds);
@@ -276,15 +276,15 @@ datetime_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
 	mempoke16(d->dat, 0x08, t->tm_yday);
 	d->dat[0xa] = t->tm_isdst;
 	(void)b0;
-	(void)b1;
+	(void)w;
 }
 
 void
-nil_talk(Device *d, Uint8 b0, Uint8 b1, Uint8 rw)
+nil_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	(void)d;
 	(void)b0;
-	(void)b1;
+	(void)w;
 }
 
 #pragma mark - Generics
diff --git a/src/uxn.c b/src/uxn.c
index 1cd44fc..666da89 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -21,8 +21,8 @@ Uint8  pop8(Stack *s) { if (s->ptr == 0) { s->error = 1; return 0; } return s->d
 Uint8  peek8(Stack *s, Uint8 a) { if (s->ptr < a + 1) s->error = 1; return s->dat[s->ptr - a - 1]; }
 void   mempoke8(Uint8 *m, Uint16 a, Uint8 b) { m[a] = b; }
 Uint8  mempeek8(Uint8 *m, Uint16 a) { return m[a]; }
-void   devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->talk(d, a & 0x0f, b, 1); }
-Uint8  devpeek8(Device *d, Uint8 a) { return d->dat[a & 0xf]; d->talk(d, a & 0x0f, 0, 0); }
+void   devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->talk(d, a & 0x0f, 1); }
+Uint8  devpeek8(Device *d, Uint8 a) { return d->dat[a & 0xf]; d->talk(d, a & 0x0f, 0); }
 void   push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
 Uint16 pop16(Stack *s) { return pop8(s) + (pop8(s) << 8); }
 Uint16 peek16(Stack *s, Uint8 a) { return peek8(s, a * 2) + (peek8(s, a * 2 + 1) << 8); }
@@ -179,7 +179,7 @@ loaduxn(Uxn *u, char *filepath)
 }
 
 Device *
-portuxn(Uxn *u, Uint8 id, char *name, void (*talkfn)(Device *d, Uint8 b0, Uint8 b1, Uint8 rw))
+portuxn(Uxn *u, Uint8 id, char *name, void (*talkfn)(Device *d, Uint8 b0, Uint8 w))
 {
 	Device *d = &u->dev[id];
 	d->addr = id * 0x10;
diff --git a/src/uxn.h b/src/uxn.h
index 5ff7673..d1f9edd 100644
--- a/src/uxn.h
+++ b/src/uxn.h
@@ -32,7 +32,7 @@ struct Uxn;
 
 typedef struct Device {
 	Uint8 addr, dat[16], *mem;
-	void (*talk)(struct Device *d, Uint8, Uint8, Uint8);
+	void (*talk)(struct Device *d, Uint8, Uint8);
 } Device;
 
 typedef struct Uxn {
@@ -47,4 +47,4 @@ int evaluxn(Uxn *u, Uint16 vec);
 void mempoke16(Uint8 *m, Uint16 a, Uint16 b);
 Uint16 mempeek16(Uint8 *m, Uint16 a);
 
-Device *portuxn(Uxn *u, Uint8 id, char *name, void (*talkfn)(Device *, Uint8, Uint8, Uint8));
\ No newline at end of file
+Device *portuxn(Uxn *u, Uint8 id, char *name, void (*talkfn)(Device *, Uint8, Uint8));
\ No newline at end of file