diff --git a/Makefile b/Makefile
index 64b33e2..7271948 100644
--- a/Makefile
+++ b/Makefile
@@ -24,8 +24,6 @@ disass: CFLAGS += -DTRACE -lreadline
 disass: bin/disass.o bin/vm.o
 	$(CC) $(CFLAGS) -o bin/$@ $^
 
-# TODO: add rule to make rom.h
-
 bin/%.o: src/%.c
 	$(CC) $(CFLAGS) -o $@ -c $^
 
@@ -33,6 +31,12 @@ bin/vm.o:
 bin/main.o:
 bin/disass.o:
 
+rom: rom.bin
+	xxd -i src/$^ > src/$@.h
+
+rom.bin: src/rom.asm src/zeropage.incbin
+	./ass.sh src/rom.asm src/zeropage.incbin
+
 hard: bin/main.o bin/vm.o
 	$(CC) $(CFLAGS) -o bin/$@$(TRACE_SUFFIX) $^
 
diff --git a/src/main.c b/src/main.c
index 1c0f5ee..e6f0fb1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -23,8 +23,8 @@ int main()
 	if (memory == NULL)
 		perror("Failed to allocate memory. Aborting...");
 
-	// __src_rom_bin* comes from "rom.h", generated by make from rom.bin
-	vm_init(&cpu, memory, __src_rom_bin, __src_rom_bin_len);
+	// src_rom_bin* comes from "rom.h", generated by make from rom.bin
+	vm_init(&cpu, memory, src_rom_bin, src_rom_bin_len);
 	printf("Fill in the rest of the flag: RS{");
 	fgets(flag_input, 20, stdin);
 	flag_input[strcspn(flag_input, "\n")] = 0;     // trim trailing newline
diff --git a/src/rom.h b/src/rom.h
index 1616f17..9c63a50 100644
--- a/src/rom.h
+++ b/src/rom.h
@@ -1,4 +1,4 @@
-unsigned char __src_rom_bin[] = {
+unsigned char src_rom_bin[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -94,4 +94,4 @@ unsigned char __src_rom_bin[] = {
   0xff, 0x0d, 0xcb, 0x02, 0x01, 0xcb, 0x02, 0x40, 0x77, 0x12, 0x00, 0x00,
   0x00, 0x30, 0x30, 0x30
 };
-unsigned int __src_rom_bin_len = 1120;
+unsigned int src_rom_bin_len = 1120;