diff --git a/Makefile b/Makefile
index 495c971..fc2eb5a 100644
--- a/Makefile
+++ b/Makefile
@@ -64,12 +64,6 @@ LIBS = -lm \
 	$(shell "$(PKG_CONFIG)" --libs sdl2) \
 	$(shell "$(PKG_CONFIG)" --libs ncursesw)
 
-# SDLCFLAGS = $(shell "$(PKG_CONFIG)" --cflags sdl2)
-# SDLLIBS = $(shell "$(PKG_CONFIG)" --libs sdl2)
-
-# override CFLAGS += $(SDLCFLAGS) -DHAS_SDL2=1
-# LIBS += $(SDLLIBS)
-
 .PHONY: all clean clean-all pretty-code install mrproper
 
 all: $(TARGETS)
diff --git a/src/emulator.c b/src/emulator.c
index bbb73a7..ca9a44a 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -10,63 +10,63 @@ typedef struct hpkey_t {
 
 static hpkey_t keyboard[ 49 ] = {
     /* From top left to bottom right */
-    {0x14,   0},
-    {0x84,   0},
-    {0x83,   0},
-    {0x82,   0},
-    {0x81,   0},
-    {0x80,   0},
+    {0x14,   false},
+    {0x84,   false},
+    {0x83,   false},
+    {0x82,   false},
+    {0x81,   false},
+    {0x80,   false},
 
-    {0x24,   0},
-    {0x74,   0},
-    {0x73,   0},
-    {0x72,   0},
-    {0x71,   0},
-    {0x70,   0},
+    {0x24,   false},
+    {0x74,   false},
+    {0x73,   false},
+    {0x72,   false},
+    {0x71,   false},
+    {0x70,   false},
 
-    {0x04,   0},
-    {0x64,   0},
-    {0x63,   0},
-    {0x62,   0},
-    {0x61,   0},
-    {0x60,   0},
+    {0x04,   false},
+    {0x64,   false},
+    {0x63,   false},
+    {0x62,   false},
+    {0x61,   false},
+    {0x60,   false},
 
-    {0x34,   0},
-    {0x54,   0},
-    {0x53,   0},
-    {0x52,   0},
-    {0x51,   0},
-    {0x50,   0},
+    {0x34,   false},
+    {0x54,   false},
+    {0x53,   false},
+    {0x52,   false},
+    {0x51,   false},
+    {0x50,   false},
 
-    {0x44,   0},
-    {0x43,   0},
-    {0x42,   0},
-    {0x41,   0},
-    {0x40,   0},
+    {0x44,   false},
+    {0x43,   false},
+    {0x42,   false},
+    {0x41,   false},
+    {0x40,   false},
 
-    {0x35,   0},
-    {0x33,   0},
-    {0x32,   0},
-    {0x31,   0},
-    {0x30,   0},
+    {0x35,   false},
+    {0x33,   false},
+    {0x32,   false},
+    {0x31,   false},
+    {0x30,   false},
 
-    {0x25,   0},
-    {0x23,   0},
-    {0x22,   0},
-    {0x21,   0},
-    {0x20,   0},
+    {0x25,   false},
+    {0x23,   false},
+    {0x22,   false},
+    {0x21,   false},
+    {0x20,   false},
 
-    {0x15,   0},
-    {0x13,   0},
-    {0x12,   0},
-    {0x11,   0},
-    {0x10,   0},
+    {0x15,   false},
+    {0x13,   false},
+    {0x12,   false},
+    {0x11,   false},
+    {0x10,   false},
 
-    {0x8000, 0},
-    {0x03,   0},
-    {0x02,   0},
-    {0x01,   0},
-    {0x00,   0},
+    {0x8000, false},
+    {0x03,   false},
+    {0x02,   false},
+    {0x01,   false},
+    {0x00,   false},
 };
 
 static int contrast = 10;