diff --git a/src/devices/file.c b/src/devices/file.c
index eb9871d..c5f3fbc 100644
--- a/src/devices/file.c
+++ b/src/devices/file.c
@@ -286,19 +286,3 @@ file_dei(Uint8 id, Uint8 *d, Uint8 port)
 	}
 	return d[port];
 }
-
-/* Boot */
-
-int
-load_rom(Uxn *u, char *filename)
-{
-	int l, i = 0;
-	FILE *f = fopen(filename, "rb");
-	if(!f)
-		return 0;
-	l = fread(&u->ram[PAGE_PROGRAM], 1, 0x10000 - PAGE_PROGRAM, f);
-	while(l && ++i < 15)
-		l = fread(u->ram + 0x10000 * i, 1, 0x10000, f);
-	fclose(f);
-	return 1;
-}
diff --git a/src/devices/file.h b/src/devices/file.h
index 5edb9f5..2a6fa13 100644
--- a/src/devices/file.h
+++ b/src/devices/file.h
@@ -14,4 +14,3 @@ WITH REGARD TO THIS SOFTWARE.
 
 void file_deo(Uint8 id, Uint8 *ram, Uint8 *d, Uint8 port);
 Uint8 file_dei(Uint8 id, Uint8 *d, Uint8 port);
-int load_rom(Uxn *u, char *filename);
diff --git a/src/devices/system.c b/src/devices/system.c
index 5339c41..9e9de93 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -39,6 +39,62 @@ system_inspect(Uxn *u)
 	system_print(u->rst, "rst");
 }
 
+/* RAM */
+
+Uint8 *
+system_init(Mmu *m, Uint16 pages)
+{
+	m->pages = (Uint8 *)calloc(0x10000 * pages, sizeof(Uint8));
+	return m->pages;
+}
+
+void
+mmu_eval(Uint8 *ram, Uint16 addr)
+{
+	Uint16 a = addr, i = 0;
+	Uint8 o = ram[a++];
+	if(o == 1) {
+		Uint16 length = (ram[a++] << 8) + ram[a++];
+		Uint16 src_page = ((ram[a++] << 8) + ram[a++]) % 16, src_addr = (ram[a++] << 8) + ram[a++];
+		Uint16 dst_page = ((ram[a++] << 8) + ram[a++]) % 16, dst_addr = (ram[a++] << 8) + ram[a];
+		for(i = 0; i < length; i++)
+			ram[dst_page * 0x10000 + dst_addr + i] = ram[src_page * 0x10000 + src_addr + i];
+	}
+}
+
+int
+system_load(Uxn *u, char *filename)
+{
+	int l, i = 0;
+	FILE *f = fopen(filename, "rb");
+	if(!f)
+		return 0;
+	l = fread(&u->ram[PAGE_PROGRAM], 1, 0x10000 - PAGE_PROGRAM, f);
+	while(l && ++i < RAM_PAGES)
+		l = fread(u->ram + 0x10000 * i, 1, 0x10000, f);
+	fclose(f);
+	return 1;
+}
+
+/* IO */
+
+void
+system_deo(Uxn *u, Uint8 *d, Uint8 port)
+{
+	Uint16 a;
+	switch(port) {
+	case 0x3:
+		PEKDEV(a, 0x2);
+		mmu_eval(u->ram, a);
+		break;
+	case 0xe:
+		if(u->wst->ptr || u->rst->ptr) system_inspect(u);
+		break;
+	}
+}
+
+/* Error */
+
 int
 uxn_halt(Uxn *u, Uint8 instr, Uint8 err, Uint16 addr)
 {
@@ -58,43 +114,3 @@ uxn_halt(Uxn *u, Uint8 instr, Uint8 err, Uint16 addr)
 	return 0;
 }
 
-/* MMU */
-
-Uint8 *
-mmu_init(Mmu *m, Uint16 pages)
-{
-	m->length = pages;
-	m->pages = (Uint8 *)calloc(0x10000 * pages, sizeof(Uint8));
-	return m->pages;
-}
-
-void
-mmu_eval(Uint8 *ram, Uint16 addr)
-{
-	Uint16 a = addr, i = 0;
-	Uint8 o = ram[a++];
-	if(o == 1) {
-		Uint16 length = (ram[a++] << 8) + ram[a++];
-		Uint16 src_page = ((ram[a++] << 8) + ram[a++]) % 16, src_addr = (ram[a++] << 8) + ram[a++];
-		Uint16 dst_page = ((ram[a++] << 8) + ram[a++]) % 16, dst_addr = (ram[a++] << 8) + ram[a];
-		for(i = 0; i < length; i++)
-			ram[dst_page * 0x10000 + dst_addr + i] = ram[src_page * 0x10000 + src_addr + i];
-	}
-}
-
-/* IO */
-
-void
-system_deo(Uxn *u, Uint8 *d, Uint8 port)
-{
-	Uint16 a;
-	switch(port) {
-	case 0x3:
-		PEKDEV(a, 0x2);
-		mmu_eval(u->ram, a);
-		break;
-	case 0xe:
-		if(u->wst->ptr || u->rst->ptr) system_inspect(u);
-		break;
-	}
-}
diff --git a/src/devices/system.h b/src/devices/system.h
index 6be1005..d0e9130 100644
--- a/src/devices/system.h
+++ b/src/devices/system.h
@@ -9,11 +9,13 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
-void system_inspect(Uxn *u);
-void system_deo(Uxn *u, Uint8 *d, Uint8 port);
+#define RAM_PAGES 0x10
 
 typedef struct {
-	Uint8 length, *pages;
+	Uint8 *pages;
 } Mmu;
 
-Uint8 *mmu_init(Mmu *m, Uint16 pages);
+Uint8 *system_init(Mmu *m, Uint16 pages);
+int system_load(Uxn *u, char *filename);
+void system_inspect(Uxn *u);
+void system_deo(Uxn *u, Uint8 *d, Uint8 port);
diff --git a/src/uxncli.c b/src/uxncli.c
index 94d7935..c8c9d97 100644
--- a/src/uxncli.c
+++ b/src/uxncli.c
@@ -81,9 +81,9 @@ main(int argc, char **argv)
 	Mmu mmu;
 	if(argc < 2)
 		return emu_error("Usage", "uxncli game.rom args");
-	if(!uxn_boot(&u, mmu_init(&mmu, 16), emu_dei, emu_deo))
+	if(!uxn_boot(&u, system_init(&mmu, RAM_PAGES), emu_dei, emu_deo))
 		return emu_error("Boot", "Failed");
-	if(!load_rom(&u, argv[1]))
+	if(!system_load(&u, argv[1]))
 		return emu_error("Load", "Failed");
 	if(!uxn_eval(&u, PAGE_PROGRAM))
 		return emu_error("Init", "Failed");
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 4811138..a41e3ff 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -264,9 +264,9 @@ static int
 start(Uxn *u, char *rom)
 {
 	free(mmu.pages);
-	if(!uxn_boot(u, mmu_init(&mmu, 16), emu_dei, emu_deo))
+	if(!uxn_boot(u, system_init(&mmu, RAM_PAGES), emu_dei, emu_deo))
 		return error("Boot", "Failed to start uxn.");
-	if(!load_rom(u, rom))
+	if(!system_load(u, rom))
 		return error("Boot", "Failed to load rom.");
 	exec_deadline = SDL_GetPerformanceCounter() + deadline_interval;
 	if(!uxn_eval(u, PAGE_PROGRAM))