diff --git a/boot.rom b/boot.rom
new file mode 100644
index 0000000..37ad1b6
Binary files /dev/null and b/boot.rom differ
diff --git a/etc/coverage.tal b/etc/coverage.tal
new file mode 100644
index 0000000..122c2a3
--- /dev/null
+++ b/etc/coverage.tal
@@ -0,0 +1,79 @@
+( test file )
+
+|0100 @program
+
+	#01 ?{ ( skip ) #ffff }
+	!{ ( skip ) #ffff }
+	{ ( skip ) #ffff } POP2r
+
+	( nested lambda )
+	{ { "hello 0a $1 } STH2r !print-str } STH2r JSR2
+
+	( function application )
+	{ 01 02 03 04 05 } STH2r { LIT "0 ADD #18 DEO #0a18 DEO JMP2r } STH2r foreach
+
+	( get lambda length )
+	{ "Dindeldums $1 } STH2r get-lambda-length <print-dec> #0a18 DEO
+
+	( allocated string )
+	;hello-word print-str
+
+	#800f DEO
+
+BRK
+
+(
+@| test label inheritance )
+
+@Object &x $1 &y $1
+
+&get-x ( -- x )
+	,&x LDR
+	JMP2r
+
+@Object/get-y ( -- y )
+	,&y LDR
+	JMP2r
+
+@Object/get-both ( -- x y )
+	/get-x /get-y
+	JMP2r
+
+( raw lambda length )
+_{ 01 02 03 }
+
+@get-lambda-length ( lambda* -- length* )
+	#0002 SUB2 LDA2
+JMP2r
+
+@print-str ( str* -- )
+	&while ( -- )
+		( send ) LDAk #18 DEO
+		( loop ) INC2 LDAk ?&while
+	POP2
+
+JMP2r
+
+@foreach ( arr* fn* -- )
+	STH2
+	DUP2
+	DUP2 #0002 SUB2 LDA2 ADD2
+	SWP2
+	&l
+		LDAk STH2kr JSR2
+		INC2 NEQ2k ?&l
+	POP2 POP2 POP2r
+JMP2r
+
+@<print-dec> ( short* -- )
+	#2710 [ LIT2r 00fb ]
+	&w ( -- )
+		DIV2k #000a DIV2k MUL2 SUB2 SWPr EQUk OVR STHkr EQU AND ?&>skip
+			DUP [ LIT "0 ] ADD #19 DEO
+			INCr &>skip
+		POP2 #000a DIV2 SWPr INCr STHkr ?&w
+	POP2r POP2 POP2 JMP2r
+
+$20 @label2
+
+@hello-word "Hello 20 "World! 0a $1
diff --git a/makefile b/makefile
index 7e2c675..6d59e68 100644
--- a/makefile
+++ b/makefile
@@ -5,28 +5,26 @@ EMU_src=${CLI_src} src/devices/screen.c src/devices/controller.c src/devices/mou
 RELEASE_flags=-DNDEBUG -O2 -g0 -s
 DEBUG_flags=-std=c89 -D_POSIX_C_SOURCE=199309L -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined
 
-.PHONY: all debug dest rom run test install uninstall format clean
+.PHONY: all debug dest run test install uninstall format clean
 
 all: dest bin/uxnasm bin/uxncli bin/uxn11
 
 dest:
 	@ mkdir -p bin
-rom:
-	@ ./bin/uxnasm etc/screen.bounds.tal bin/res.rom
-run: all bin/uxnasm bin/uxncli bin/uxn11 rom
-	@ ./bin/uxn11 bin/res.rom
+run: all bin/uxnasm bin/uxncli bin/uxn11
+	@ ./bin/uxn11 
 test: bin/uxnasm bin/uxncli bin/uxn11
-	@ ./bin/uxnasm && ./bin/uxncli && ./bin/uxn11 && ./bin/uxnasm -v && ./bin/uxncli -v && ./bin/uxn11 -v
+	@ ./bin/uxnasm -v && ./bin/uxncli -v && ./bin/uxn11 -v
 	@ ./bin/uxnasm etc/opctest.tal bin/opctest.rom
 	@ ./bin/uxncli bin/opctest.rom
-install: bin/uxnasm bin/uxncli bin/uxn11
+install: all bin/uxnasm bin/uxncli bin/uxn11
 	@ cp bin/uxn11 bin/uxnasm bin/uxncli ~/bin/
 uninstall:
 	@ rm -f ~/bin/uxn11 ~/bin/uxnasm ~/bin/uxncli
 format:
 	@ clang-format -i src/uxnasm.c src/uxncli.c src/uxn11.c src/devices/*
 clean:
-	@ rm -f bin/uxnasm bin/uxncli bin/uxn11 bin/polycat.rom bin/polycat.rom.sym
+	@ rm -fr bin
 
 bin/uxnasm: src/uxnasm.c
 	@ cc ${RELEASE_flags} ${CFLAGS} src/uxnasm.c -o bin/uxnasm
diff --git a/src/uxn11.c b/src/uxn11.c
index 907537a..8bd6167 100644
--- a/src/uxn11.c
+++ b/src/uxn11.c
@@ -296,16 +296,14 @@ main(int argc, char **argv)
 {
 	Uxn u = {0};
 	int i = 1;
-	if(i == argc) {
-		fprintf(stdout, "usage: %s [-v] file.rom [args..]\n", argv[0]);
-		return 0;
-	}
-	if(argv[i][0] == '-' && argv[i][1] == 'v') {
-		fprintf(stdout, "Uxn11 - Varvara Emulator, 14 Feb 2023.\n");
+	char *rom;
+	if(i != argc && argv[i][0] == '-' && argv[i][1] == 'v') {
+		fprintf(stdout, "Uxn11 - Varvara Emulator, 22 Feb 2023.\n");
 		i++;
 	}
-	if(!system_boot(&u, (Uint8 *)calloc(0x10000 * RAM_PAGES, sizeof(Uint8)), argv[i++])) {
-		fprintf(stdout, "Could not boot.\n");
+	rom = i == argc ? "boot.rom" : argv[i++];
+	if(!system_boot(&u, (Uint8 *)calloc(0x10000 * RAM_PAGES, sizeof(Uint8)), rom)) {
+		fprintf(stdout, "usage: %s [-v] file.rom [args..]\n", argv[0]);
 		return 0;
 	}
 	if(!display_init()) {
diff --git a/src/uxnasm.c b/src/uxnasm.c
index f80d63b..d1dcf09 100644
--- a/src/uxnasm.c
+++ b/src/uxnasm.c
@@ -55,6 +55,8 @@ static char ops[][4] = {
 	"ADD", "SUB", "MUL", "DIV", "AND", "ORA", "EOR", "SFT"
 };
 
+static char *runes = "|$@&,_.-;=!?#\"%~";
+
 static int   scmp(char *a, char *b, int len) { int i = 0; while(a[i] == b[i]) if(!a[i] || ++i >= len) return 1; return 0; } /* string compare */
 static int   sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f')) return 0; return i > 1; } /* string is hexadecimal */
 static int   shex(char *s) { int n = 0, i = 0; char c; while((c = s[i++])) if(c >= '0' && c <= '9') n = n * 16 + (c - '0'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
@@ -156,6 +158,15 @@ makemacro(char *name, FILE *f)
 	return 1;
 }
 
+static int
+isrune(char c)
+{
+	char cc, *r = runes;
+	while((cc = *r++))
+		if(c == cc) return 1;
+	return 0;
+}
+
 static int
 makelabel(char *name)
 {
@@ -166,6 +177,8 @@ makelabel(char *name)
 		return error("Label name is hex number", name);
 	if(findopcode(name) || scmp(name, "BRK", 4) || !slen(name))
 		return error("Label name is invalid", name);
+	if(isrune(name[0]))
+		return error("Label name is runic", name);
 	if(p.label_len == 0x400)
 		return error("Labels limit exceeded", name);
 	l = &p.labels[p.label_len++];
@@ -195,7 +208,7 @@ makereference(char *scope, char *label, char rune, Uint16 addr)
 	if(label[0] == '{') {
 		p.lambda_stack[p.lambda_ptr++] = p.lambda_count;
 		scpy(makelambda(p.lambda_count++), r->name, 0x40);
-	} else if(label[0] == '&') {
+	} else if(label[0] == '&' || label[0] == '/') {
 		if(!sublabel(subw, scope, label + 1))
 			return error("Invalid sublabel", label);
 		scpy(subw, r->name, 0x40);
@@ -320,7 +333,10 @@ parse(char *w, FILE *f)
 	case '@': /* label */
 		if(!makelabel(w + 1))
 			return error("Invalid label", w);
-		scpy(w + 1, p.scope, 0x40);
+		i = 0;
+		while(w[i + 1] != '/' && i < 0x3e && (p.scope[i] = w[i + 1]))
+			i++;
+		p.scope[i] = '\0';
 		break;
 	case '&': /* sublabel */
 		if(!sublabel(subw, p.scope, w + 1) || !makelabel(subw))
@@ -346,7 +362,6 @@ parse(char *w, FILE *f)
 	case '.': /* literal byte zero-page */
 		makereference(p.scope, w + 1, w[0], p.ptr + 1);
 		return writelitbyte(0xff);
-	case ':':
 	case '=': /* raw short absolute */
 		makereference(p.scope, w + 1, w[0], p.ptr);
 		return writeshort(0xffff, 0);
@@ -420,7 +435,6 @@ resolve(void)
 			p.data[r->addr] = l->addr & 0xff;
 			l->refs++;
 			break;
-		case ':':
 		case '=':
 		case ';':
 			if(!(l = findlabel(r->name)))
@@ -501,14 +515,12 @@ main(int argc, char *argv[])
 	if(argc == 1)
 		return error("usage", "uxnasm [-v] input.tal output.rom");
 	if(argv[1][0] == '-' && argv[1][1] == 'v')
-		return !fprintf(stdout, "Uxnasm - Uxntal Assembler, 27 Oct 2023.\n");
+		return !fprintf(stdout, "Uxnasm - Uxntal Assembler, 25 Feb 2024.\n");
 	if(!(src = fopen(argv[1], "r")))
 		return !error("Invalid input", argv[1]);
 	if(!assemble(src))
 		return !error("Assembly", "Failed to assemble rom.");
-	if(scmp(argv[2], "-", 2))
-		dst = stdout;
-	else if(!(dst = fopen(argv[2], "wb")))
+	if(!(dst = fopen(argv[2], "wb")))
 		return !error("Invalid Output", argv[2]);
 	if(p.length <= TRIM)
 		return !error("Assembly", "Output rom is empty.");