diff --git a/etc/mmu.tal b/etc/mmu.tal
new file mode 100644
index 0000000..7d2a85e
--- /dev/null
+++ b/etc/mmu.tal
@@ -0,0 +1,56 @@
+|00 @System &vector $2 &expansion $2 &wst $1 &rst $1 &metadata $2 &r $2 &g $2 &b $2 &debug $1 &state $1
+|100
+
+@on-reset ( -> )
+	;buf <pstr>
+	#2018 DEO
+	;buf <pstr>
+	#0a18 DEO
+	( | copy left )
+	;buf #0006 ADD2 ;mmu-cpyl/a STA2
+	;buf #0003 ADD2 ;mmu-cpyl/b STA2
+	;mmu-cpyl .System/expansion DEO2
+	;buf <pstr>
+	#2018 DEO
+	;res1 <pstr>
+	#0a18 DEO
+	( | copy right )
+	;buf #0003 ADD2 ;mmu-cpyr/a STA2
+	;buf #0009 ADD2 ;mmu-cpyr/b STA2
+	;mmu-cpyr .System/expansion DEO2
+	;buf <pstr>
+	#2018 DEO
+	;res2 <pstr>
+	#0a18 DEO
+	( | copy left )
+	;buf #0009 ADD2 ;mmu-cpyl/a STA2
+	;buf #0006 ADD2 ;mmu-cpyl/b STA2
+	;mmu-cpyl .System/expansion DEO2
+	;buf <pstr>
+	#2018 DEO
+	;res3 <pstr>
+	#0a18 DEO
+	( | memset )
+	;buf #0003 ADD2 ;mmu-fill/a STA2
+	;mmu-fill .System/expansion DEO2
+	;buf <pstr>
+	#2018 DEO
+	;res4 <pstr>
+	#0a18 DEO
+	BRK
+
+@<pstr> ( str* -- )
+	LDAk #18 DEO
+	INC2 LDAk ?<pstr>
+	POP2 JMP2r
+
+@buf  [ "......[hello]..... $1 ]
+@res1 [ "...[hello]o]...... $1 ]
+@res2 [ "...[hello[hello].. $1 ]
+@res3 [ "...[he[hello]lo].. $1 ]
+@res4 [ "...-------------.. $1 ]
+
+@mmu-fill [ 00 000d 0000 &a $2 2d ]
+@mmu-cpyl [ 01 0007 0000 &a $2 0000 &b $2 ]
+@mmu-cpyr [ 02 0007 0000 &a $2 0000 &b $2 ]
+
diff --git a/src/devices/system.c b/src/devices/system.c
index 0f96fdb..5987eb5 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -116,14 +116,29 @@ system_deo(Uxn *u, Uint8 *d, Uint8 port)
 	case 0x3:
 		ram = u->ram;
 		addr = PEEK2(d + 2);
-		if(ram[addr] == 0x1) {
+		if(ram[addr] == 0x0) {
+			Uint8 value = ram[addr + 7];
 			Uint16 i, length = PEEK2(ram + addr + 1);
-			Uint16 a_page = PEEK2(ram + addr + 1 + 2), a_addr = PEEK2(ram + addr + 1 + 4);
-			Uint16 b_page = PEEK2(ram + addr + 1 + 6), b_addr = PEEK2(ram + addr + 1 + 8);
+			Uint16 dst_page = PEEK2(ram + addr + 3), dst_addr = PEEK2(ram + addr + 5);
+			int dst = (dst_page % RAM_PAGES) * 0x10000;
+			for(i = 0; i < length; i++)
+				ram[dst + (Uint16)(dst_addr + i)] = value;
+		} else if(ram[addr] == 0x1) {
+			Uint16 i, length = PEEK2(ram + addr + 1);
+			Uint16 a_page = PEEK2(ram + addr + 3), a_addr = PEEK2(ram + addr + 5);
+			Uint16 b_page = PEEK2(ram + addr + 7), b_addr = PEEK2(ram + addr + 9);
 			int src = (a_page % RAM_PAGES) * 0x10000, dst = (b_page % RAM_PAGES) * 0x10000;
 			for(i = 0; i < length; i++)
 				ram[dst + (Uint16)(b_addr + i)] = ram[src + (Uint16)(a_addr + i)];
-		}
+		} else if(ram[addr] == 0x2) {
+			Uint16 i, length = PEEK2(ram + addr + 1);
+			Uint16 a_page = PEEK2(ram + addr + 3), a_addr = PEEK2(ram + addr + 5);
+			Uint16 b_page = PEEK2(ram + addr + 7), b_addr = PEEK2(ram + addr + 9);
+			int src = (a_page % RAM_PAGES) * 0x10000, dst = (b_page % RAM_PAGES) * 0x10000;
+			for(i = length - 1; i != 0xffff; i--)
+				ram[dst + (Uint16)(b_addr + i)] = ram[src + (Uint16)(a_addr + i)];
+		} else
+			fprintf(stderr, "Unknown Expansion Command 0x%02x\n", ram[addr]);
 		break;
 	case 0x4:
 		u->wst.ptr = d[4];
diff --git a/src/uxn11.c b/src/uxn11.c
index 779b8ff..c795ca0 100644
--- a/src/uxn11.c
+++ b/src/uxn11.c
@@ -271,7 +271,7 @@ main(int argc, char **argv)
 	int i = 1;
 	char *rom;
 	if(i != argc && argv[i][0] == '-' && argv[i][1] == 'v') {
-		fprintf(stdout, "Uxn11 - Varvara Emulator, 7 Mar 2023.\n");
+		fprintf(stdout, "Uxn11 - Varvara Emulator, 18 Mar 2024.\n");
 		i++;
 	}
 	rom = i == argc ? "boot.rom" : argv[i++];
diff --git a/src/uxncli.c b/src/uxncli.c
index 76e625b..f7f9fc2 100644
--- a/src/uxncli.c
+++ b/src/uxncli.c
@@ -71,7 +71,7 @@ main(int argc, char **argv)
 		return system_error("usage", "uxncli [-v] file.rom [args..]");
 	/* Read flags */
 	if(argv[i][0] == '-' && argv[i][1] == 'v')
-		return system_version("Uxncli - Console Varvara Emulator", "4 Mar 2024");
+		return system_version("Uxncli - Console Varvara Emulator", "18 Mar 2024");
 	if(!system_boot(&u, (Uint8 *)calloc(0x10000 * RAM_PAGES, sizeof(Uint8)), argv[i++]))
 		return system_error("Init", "Failed to initialize uxn.");
 	/* Game Loop */