diff --git a/sw/Makefile b/sw/Makefile
index 011f486..b2a834e 100644
--- a/sw/Makefile
+++ b/sw/Makefile
@@ -1,5 +1,5 @@
 CC=cl65
-CFLAGS=-t none
+CFLAGS=-t none -I.
 LDFLAGS=-C link.ld
 
 NAME=bootrom
@@ -11,7 +11,9 @@ SRCS=$(wildcard *.S) $(wildcard *.c)
 OBJS+=$(patsubst %.S,%.o,$(filter %S,$(SRCS)))
 OBJS+=$(patsubst %.c,%.o,$(filter %c,$(SRCS)))
 
-all: $(BIN)
+all: $(HEX)
+
+$(HEX): $(BIN)
 	objcopy --input-target=binary --output-target=ihex $(BIN) $(HEX)
 	
 
diff --git a/sw/io.h b/sw/io.h
new file mode 100644
index 0000000..c46ae2c
--- /dev/null
+++ b/sw/io.h
@@ -0,0 +1,6 @@
+#ifndef _IO_H
+#define IO_H
+
+#define IO_REMAP *(unsigned char*)0x7f00
+
+#endif
diff --git a/sw/main.c b/sw/main.c
index 499dad1..0125093 100644
--- a/sw/main.c
+++ b/sw/main.c
@@ -1,4 +1,5 @@
+#include <io.h>
 
 int main() {
-    return 1;
+   IO_REMAP = 1; 
 }