diff --git a/src/debugger.c b/src/debugger.c
index 82ccbe7..c61a79a 100644
--- a/src/debugger.c
+++ b/src/debugger.c
@@ -38,7 +38,7 @@ printstack(Stack *s)
 #pragma mark - Devices
 
 Uint8
-console_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+console_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	switch(b0) {
 	case 0x08: printf("%c", b1); break;
@@ -46,17 +46,17 @@ console_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
 	case 0x0b: printf("0x%04x\n", (m[0x0a] << 8) + b1); break;
 	}
 	fflush(stdout);
-	(void)u;
+	(void)d;
 	(void)b0;
 	return b1;
 }
 
 Uint8
-file_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+file_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	Uint8 read = b0 == 0xd;
 	if(read || b0 == 0xf) {
-		char *name = (char *)&u->ram.dat[mempeek16(m, 0x8)];
+		char *name = (char *)&d->mem[mempeek16(m, 0x8)];
 		Uint16 result = 0, length = mempeek16(m, 0xa);
 		Uint16 offset = mempeek16(m, 0x4);
 		Uint16 addr = (m[b0 - 1] << 8) | b1;
@@ -72,9 +72,9 @@ file_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
 }
 
 Uint8
-ppnil(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+ppnil(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
-	(void)u;
+	(void)d;
 	(void)m;
 	(void)b0;
 	return b1;
diff --git a/src/emulator.c b/src/emulator.c
index f18c56d..b3d13be 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -182,35 +182,35 @@ doctrl(Uxn *u, SDL_Event *event, int z)
 #pragma mark - Devices
 
 Uint8
-system_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+system_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	putcolors(&ppu, &m[0x8]);
 	reqdraw = 1;
-	(void)u;
+	(void)d;
 	(void)b0;
 	return b1;
 }
 
 Uint8
-console_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+console_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	switch(b0) {
 	case 0x8: printf("%c", b1); break;
 	case 0x9: printf("0x%02x\n", b1); break;
 	case 0xb: printf("0x%04x\n", (m[0xa] << 8) + b1); break;
-	case 0xd: printf("%s\n", &u->ram.dat[(m[0xc] << 8) + b1]); break;
+	case 0xd: printf("%s\n", &d->mem[(m[0xc] << 8) + b1]); break;
 	}
 	fflush(stdout);
 	return b1;
 }
 
 Uint8
-screen_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+screen_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	if(b0 == 0xe) {
 		Uint16 x = mempeek16(m, 0x8);
 		Uint16 y = mempeek16(m, 0xa);
-		Uint8 *addr = &u->ram.dat[mempeek16(m, 0xc)];
+		Uint8 *addr = &d->mem[mempeek16(m, 0xc)];
 		Uint8 *layer = b1 >> 4 & 0x1 ? ppu.fg : ppu.bg;
 		switch(b1 >> 5) {
 		case 0: putpixel(&ppu, layer, x, y, b1 & 0x3); break;
@@ -223,27 +223,32 @@ screen_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
 }
 
 Uint8
-file_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+file_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
+	/* TODO: Figure out why fwrite doesn't work with d->mem
 	Uint8 read = b0 == 0xd;
 	if(read || b0 == 0xf) {
-		char *name = (char *)&u->ram.dat[mempeek16(m, 0x8)];
+		char *name = (char *)&d->mem[mempeek16(m, 0x8)];
 		Uint16 result = 0, length = mempeek16(m, 0xa);
 		Uint16 offset = mempeek16(m, 0x4);
 		Uint16 addr = (m[b0 - 1] << 8) | b1;
 		FILE *f = fopen(name, read ? "r" : (offset ? "a" : "w"));
 		if(f) {
-			if(fseek(f, offset, SEEK_SET) != -1 && (result = read ? fread(&u->ram.dat[addr], 1, length, f) : fwrite(&u->ram.dat[addr], 1, length, f)))
+			if(fseek(f, offset, SEEK_SET) != -1 && (result = read ? fread(d->mem[addr], 1, length, f) : fwrite(&d->mem[addr], 1, length, f)))
 				printf("%s %d bytes, at %04x from %s\n", read ? "Loaded" : "Saved", length, addr, name);
 			fclose(f);
 		}
 		mempoke16(m, 0x2, result);
 	}
+	*/
+	(void)d;
+	(void)m;
+	(void)b0;
 	return b1;
 }
 
 static Uint8
-audio_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+audio_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	if(b0 == 0xa) {
 		if(b1 >= apu.n_notes) apu.notes = SDL_realloc(apu.notes, (b1 + 1) * sizeof(Note));
@@ -261,21 +266,12 @@ audio_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
 		apu.queue->dat[apu.queue->n++] = (m[0xd] << 8) + b1;
 	} else if(b0 == 0xf && apu.queue != NULL)
 		apu.queue->finishes = 1;
-	(void)u;
+	(void)d;
 	return b1;
 }
 
 Uint8
-midi_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
-{
-	(void)u;
-	(void)m;
-	printf("midi - %02x,%02x\n", b0, b1);
-	return b1;
-}
-
-Uint8
-datetime_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+datetime_poke(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
 	time_t seconds = time(NULL);
 	struct tm *t = localtime(&seconds);
@@ -289,15 +285,15 @@ datetime_poke(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
 	m[0x7] = t->tm_wday;
 	mempoke16(m, 0x08, t->tm_yday);
 	m[0xa] = t->tm_isdst;
-	(void)u;
+	(void)d;
 	(void)b0;
 	return b1;
 }
 
 Uint8
-ppnil(Uxn *u, Uint8 *m, Uint8 b0, Uint8 b1)
+ppnil(Device *d, Uint8 *m, Uint8 b0, Uint8 b1)
 {
-	(void)u;
+	(void)d;
 	(void)m;
 	(void)b0;
 	return b1;
diff --git a/src/uxn.c b/src/uxn.c
index df67eb2..7a1dd6b 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -21,15 +21,15 @@ 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(Uxn *u, Uint8 a, Uint8 b) { Device *dev = &u->dev[a >> 4]; dev->dat[a & 0xf] = b; dev->poke(u, dev->dat, a & 0x0f, b); }
-Uint8  devpeek8(Uxn *u, Uint8 a) { return u->dev[a >> 4].dat[a & 0xf]; }
+void   devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->poke(d, d->dat, a & 0x0f, b); }
+Uint8  devpeek8(Device *d, Uint8 a) { return d->dat[a & 0xf]; }
 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); }
 void   mempoke16(Uint8 *m, Uint16 a, Uint16 b) { mempoke8(m, a, b >> 8); mempoke8(m, a + 1, b); }
 Uint16 mempeek16(Uint8 *m, Uint16 a) { return (mempeek8(m, a) << 8) + mempeek8(m, a + 1); }
-void   devpoke16(Uxn *u, Uint8 a, Uint16 b) { devpoke8(u, a, b >> 8); devpoke8(u, a + 1, b); }
-Uint16 devpeek16(Uxn *u, Uint16 a) { return (devpeek8(u, a) << 8) + devpeek8(u, a + 1); }
+void   devpoke16(Device *d, Uint8 a, Uint16 b) { devpoke8(d, a, b >> 8); devpoke8(d, a + 1, b); }
+Uint16 devpeek16(Device *d, Uint16 a) { return (devpeek8(d, a) << 8) + devpeek8(d, a + 1); }
 /* Stack */
 void op_brk(Uxn *u) { u->ram.ptr = 0; }
 void op_nop(Uxn *u) { (void)u; }
@@ -46,8 +46,8 @@ void op_gth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b
 void op_lth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b < a); }
 void op_gts(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, (Sint8)b > (Sint8)a); }
 void op_lts(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, (Sint8)b < (Sint8)a); }
-void op_ior(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, devpeek8(u, a)); }
-void op_iow(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); devpoke8(u, a, b); }
+void op_ior(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, devpeek8(&u->dev[a >> 4], a)); }
+void op_iow(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); devpoke8(&u->dev[a >> 4], a, b); }
 /* Memory */
 void op_pek(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(&u->ram.dat[0], a)); }
 void op_pok(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(&u->ram.dat[0], a, b); }
@@ -80,8 +80,8 @@ void op_gth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->sr
 void op_lth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b < a); }
 void op_gts16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, (Sint16)b > (Sint16)a); }
 void op_lts16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, (Sint16)b < (Sint16)a); }
-void op_ior16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, devpeek16(u, a)); }
-void op_iow16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); devpoke16(u, a, b); }
+void op_ior16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, devpeek16(&u->dev[a >> 4], a)); }
+void op_iow16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); devpoke16(&u->dev[a >> 4], a, b); }
 /* Memory(16-bits) */
 void op_pek16(Uxn *u) { Uint16 a = pop16(u->src); push8(u->src, mempeek8(&u->ram.dat[0], a)); }
 void op_pok16(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); mempoke8(&u->ram.dat[0], a, b); }
@@ -179,10 +179,11 @@ loaduxn(Uxn *u, char *filepath)
 }
 
 Device *
-portuxn(Uxn *u, Uint8 id, char *name, Uint8 (*pofn)(Uxn *u, Uint8 *devmem, Uint8 b0, Uint8 b1))
+portuxn(Uxn *u, Uint8 id, char *name, Uint8 (*pofn)(Device *d, Uint8 *devmem, Uint8 b0, Uint8 b1))
 {
 	Device *d = &u->dev[id];
 	d->addr = id * 0x10;
+	d->mem = &u->ram.dat[0];
 	d->poke = pofn;
 	printf("Device added #%02x: %s, at 0x%04x \n", id, name, d->addr);
 	return d;
diff --git a/src/uxn.h b/src/uxn.h
index 068c54b..ff908d0 100644
--- a/src/uxn.h
+++ b/src/uxn.h
@@ -32,7 +32,7 @@ struct Uxn;
 
 typedef struct Device {
 	Uint8 addr, dat[16], *mem;
-	Uint8 (*poke)(struct Uxn *u, Uint8 *devmem, Uint8, Uint8);
+	Uint8 (*poke)(struct Device *d, Uint8 *devmem, 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, Uint8 (*pofn)(Uxn *, Uint8 *, Uint8, Uint8));
\ No newline at end of file
+Device *portuxn(Uxn *u, Uint8 id, char *name, Uint8 (*pofn)(Device *, Uint8 *, Uint8, Uint8));
\ No newline at end of file