diff --git a/src/devices/system.c b/src/devices/system.c
index e41daa4..57b3aa9 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -32,7 +32,7 @@ system_load(Uint8 *ram, char *rom_path)
 	FILE *f = fopen(rom_path, "rb");
 	if(f) {
 		int i = 0, l = fread(ram, PAGE_SIZE - PAGE_PROGRAM, 1, f);
-		while(l && ++i < RAM_PAGES)
+		while(l && ++i < BANKS)
 			l = fread(ram + PAGE_SIZE * i - PAGE_PROGRAM, PAGE_SIZE, 1, f);
 		fclose(f);
 	}
@@ -67,6 +67,31 @@ system_reboot(int soft)
 	return system_boot(uxn.ram, boot_path, 0);
 }
 
+static void
+system_expansion(const Uint16 addr)
+{
+	Uint8 *aptr = uxn.ram + addr;
+	Uint16 length = PEEK2(aptr + 1);
+	if(uxn.ram[addr] == 0x0) {
+		unsigned int a = PEEK2(aptr + 3) * 0x10000 + PEEK2(aptr + 5);
+		unsigned int b = a + length;
+		unsigned int value = uxn.ram[addr + 7];
+		for(b = b < BANKS_CAP ? b : BANKS_CAP; a < b; uxn.ram[a++] = value);
+	} else if(uxn.ram[addr] == 0x1) {
+		unsigned int a = PEEK2(aptr + 3) * 0x10000 + PEEK2(aptr + 5);
+		unsigned int b = a + length;
+		unsigned int c = PEEK2(aptr + 7) * 0x10000 + PEEK2(aptr + 9);
+		for(b = b < BANKS_CAP ? b : BANKS_CAP; a < b; uxn.ram[c++] = uxn.ram[a++]);
+	} else if(uxn.ram[addr] == 0x2) {
+		unsigned int a = PEEK2(aptr + 3) * 0x10000 + PEEK2(aptr + 5);
+		unsigned int b = a + length;
+		unsigned int c = PEEK2(aptr + 7) * 0x10000 + PEEK2(aptr + 9);
+		unsigned int d = c + length;
+		for(; b >= a; uxn.ram[--d] = uxn.ram[--b]);
+	} else
+		fprintf(stderr, "Unknown command: %s\n", &uxn.ram[addr]);
+}
+
 /* IO */
 
 Uint8
@@ -84,28 +109,7 @@ system_deo(Uint8 port)
 {
 	switch(port) {
 	case 0x3: {
-		Uint16 value;
-		Uint16 addr = PEEK2(uxn.dev + 2);
-		Uint8 *aptr = uxn.ram + addr;
-		Uint16 length = PEEK2(aptr + 1);
-		if(uxn.ram[addr] == 0x0) {
-			unsigned int a = PEEK2(aptr + 3) * PAGE_SIZE + PEEK2(aptr + 5);
-			unsigned int b = a + length;
-			value = uxn.ram[addr + 7];
-			for(; a < b; uxn.ram[a++] = value);
-		} else if(uxn.ram[addr] == 0x1) {
-			unsigned int a = PEEK2(aptr + 3) * PAGE_SIZE + PEEK2(aptr + 5);
-			unsigned int b = a + length;
-			unsigned int c = PEEK2(aptr + 7) * PAGE_SIZE + PEEK2(aptr + 9);
-			for(; a < b; uxn.ram[c++] = uxn.ram[a++]);
-		} else if(uxn.ram[addr] == 0x2) {
-			unsigned int a = PEEK2(aptr + 3) * PAGE_SIZE + PEEK2(aptr + 5);
-			unsigned int b = a + length;
-			unsigned int c = PEEK2(aptr + 7) * PAGE_SIZE + PEEK2(aptr + 9);
-			unsigned int d = c + length;
-			for(; b >= a; uxn.ram[--d] = uxn.ram[--b]);
-		} else
-			fprintf(stderr, "Unknown Expansion Command 0x%02x\n", uxn.ram[addr]);
+		system_expansion(PEEK2(uxn.dev + 2));
 		break;
 	}
 	case 0x4:
diff --git a/src/devices/system.h b/src/devices/system.h
index 1590d8e..a5d66be 100644
--- a/src/devices/system.h
+++ b/src/devices/system.h
@@ -9,7 +9,8 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
-#define RAM_PAGES 0x10
+#define BANKS 0x10
+#define BANKS_CAP BANKS * 0x10000
 
 int system_error(char *msg, const char *err);
 int system_boot(Uint8 *ram, char *rom_path, int has_args);
diff --git a/src/uxncli.c b/src/uxncli.c
index 384d858..b8ef114 100644
--- a/src/uxncli.c
+++ b/src/uxncli.c
@@ -48,10 +48,10 @@ main(int argc, char **argv)
 {
 	int i = 1;
 	if(argc == 2 && argv[1][0] == '-' && argv[1][1] == 'v')
-		return !fprintf(stdout, "Uxn(cli) - Varvara Emulator, 31 Jan 2025.\n");
+		return !fprintf(stdout, "Uxn(cli) - Varvara Emulator, 27 Jun 2025.\n");
 	else if(argc == 1)
 		return !fprintf(stdout, "usage: %s [-v] file.rom [args..]\n", argv[0]);
-	else if(!system_boot((Uint8 *)calloc(PAGE_SIZE * RAM_PAGES, sizeof(Uint8)), argv[i++], argc > 2))
+	else if(!system_boot((Uint8 *)calloc(PAGE_SIZE * BANKS, sizeof(Uint8)), argv[i++], argc > 2))
 		return !fprintf(stdout, "Could not load %s.\n", argv[i - 1]);
 	if(console_vector) {
 		console_arguments(i, argc, argv);
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 08d56b8..de8a19d 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -482,7 +482,7 @@ main(int argc, char **argv)
 	rom_path = i == argc ? "boot.rom" : argv[i++];
 	if(!emu_init())
 		return system_error("Init", "Failed to initialize varvara.");
-	if(!system_boot((Uint8 *)calloc(PAGE_SIZE * RAM_PAGES + 1, sizeof(Uint8)), rom_path, argc > i))
+	if(!system_boot((Uint8 *)calloc(PAGE_SIZE * BANKS + 1, sizeof(Uint8)), rom_path, argc > i))
 		return system_error("usage:", "uxnemu [-v | -f | -2x | -3x] file.rom [args...]");
 	/* start */
 	console_arguments(i, argc, argv);