diff --git a/src/devices/file.c b/src/devices/file.c
index 9cc4b47..29246af 100644
--- a/src/devices/file.c
+++ b/src/devices/file.c
@@ -140,19 +140,20 @@ retry_realpath(const char *file_name)
 		return NULL;
 	}
 	if(notdriveroot(file_name)) {
+		/* TODO: use a macro instead of '/' for absolute path first character so that other systems can work */
 		/* if a relative path, prepend cwd */
 		getcwd(p, sizeof(p));
 		if(strlen(p) + strlen(DIR_SEP_STR) + fnlen >= PATH_MAX) {
 			errno = ENAMETOOLONG;
 			return NULL;
 		}
-		strcat(p, DIR_SEP_STR);
+		strcat(p, DIR_SEP_STR); /* TODO: use a macro instead of '/' for the path delimiter */
 	}
 	strcat(p, file_name);
 	while((r = realpath(p, NULL)) == NULL) {
 		if(errno != ENOENT)
 			return NULL;
-		x = strrchr(p, DIR_SEP_CHAR);
+		x = strrchr(p, DIR_SEP_CHAR); /* TODO: path delimiter macro */
 		if(x)
 			*x = '\0';
 		else
diff --git a/src/devices/system.c b/src/devices/system.c
index 192d1b0..e41daa4 100644
--- a/src/devices/system.c
+++ b/src/devices/system.c
@@ -14,8 +14,6 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
-#define PAGE_INDEX(bank, addr) ((bank) * PAGE_SIZE + ((addr) & PAGE_MASK))
-
 char *boot_path;
 
 static void
@@ -86,37 +84,26 @@ 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 src_bank = PEEK2(aptr + 3);
-			unsigned int src_addr = PEEK2(aptr + 5);
-			Uint16 value = uxn.ram[addr + 7];
-			if(src_bank < RAM_PAGES) {
-				unsigned int a = src_addr;
-				unsigned int b = a + length;
-				for(; a < b; uxn.ram[PAGE_INDEX(src_bank, a++)] = value);
-			}
+			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 src_bank = PEEK2(aptr + 3);
-			unsigned int src_addr = PEEK2(aptr + 5);
-			unsigned int dst_bank = PEEK2(aptr + 7);
-			unsigned int dst_addr = PEEK2(aptr + 9);
-			if(src_bank < RAM_PAGES && dst_bank < RAM_PAGES) {
-				unsigned int src_last = src_addr + length;
-				for(; src_addr < src_last; uxn.ram[PAGE_INDEX(dst_bank, dst_addr++)] = uxn.ram[PAGE_INDEX(src_bank, src_addr++)]);
-			}
+			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 src_bank = PEEK2(aptr + 3);
-			unsigned int src_addr = PEEK2(aptr + 5);
-			unsigned int dst_bank = PEEK2(aptr + 7);
-			unsigned int dst_addr = PEEK2(aptr + 9);
-			if(src_bank < RAM_PAGES && dst_bank < RAM_PAGES) {
-				unsigned int src_last = src_addr + length;
-				unsigned int dst_last = dst_addr + length;
-				for(; src_last > src_addr; uxn.ram[PAGE_INDEX(dst_bank, --dst_last)] = uxn.ram[PAGE_INDEX(src_bank, --src_last)]);
-			}
+			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]);
 		break;
diff --git a/src/uxn.h b/src/uxn.h
index a8b174d..1b7e660 100644
--- a/src/uxn.h
+++ b/src/uxn.h
@@ -19,7 +19,6 @@ WITH REGARD TO THIS SOFTWARE.
 #define STEP_MAX 0x80000000
 #define PAGE_PROGRAM 0x0100
 #define PAGE_SIZE 0x10000
-#define PAGE_MASK 0xffff
 
 typedef unsigned char Uint8;
 typedef signed char Sint8;
diff --git a/src/uxnemu.c b/src/uxnemu.c
index d70f82a..08d56b8 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -469,7 +469,7 @@ main(int argc, char **argv)
 	/* flags */
 	if(argc > 1 && argv[i][0] == '-') {
 		if(!strcmp(argv[i], "-v"))
-			return system_error("Uxn(gui) - Varvara Emulator", "4 Apr 2025.");
+			return system_error("Uxn(gui) - Varvara Emulator", "27 Jun 2025.");
 		else if(!strcmp(argv[i], "-2x"))
 			set_zoom(2, 0);
 		else if(!strcmp(argv[i], "-3x"))