diff --git a/Makefile b/Makefile
index 0b9e19a..9620aa4 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ STRIP = strip
 MCUFLAGS = -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
 AFLAGS = $(MCUFLAGS) 
 CFLAGS = $(MCUFLAGS) -ggdb \
-	-Iinclude -Iinclude/it -Iinclude/cmsis \
+	-Iinclude -Iinclude/cmsis \
 	-fno-builtin -fsigned-char -ffreestanding \
 	-Wall -Werror -Wextra -pedantic \
 	-Wno-overlength-strings -Wno-discarded-qualifiers
diff --git a/boot b/boot
new file mode 100644
index 0000000..13e5876
--- /dev/null
+++ b/boot
@@ -0,0 +1,3 @@
+choice = filemenu
+print("\nChoice: ")
+print(choice)
diff --git a/include/script.h b/include/script.h
index 971cccf..bddb872 100644
--- a/include/script.h
+++ b/include/script.h
@@ -21,7 +21,7 @@
 #ifndef SCRIPT_H_
 #define SCRIPT_H_
 
-#include <parser.h>
+#include <it/parser.h>
 
 /**
  * Loads the library for the given interpreter instance.
diff --git a/initrd.c b/initrd.c
new file mode 100644
index 0000000..3f36cd9
--- /dev/null
+++ b/initrd.c
@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <string.h>
+
+extern uint8_t *initrd_start;
+extern uint32_t initrd_size;
+
+char *getfile(uint32_t offset)
+{
+	char *ptr = initrd_start;
+	for (uint32_t i = 0; i < offset; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		uint32_t datalen = *((uint32_t *)(ptr + 4 + len));
+		ptr += len + datalen + 8;
+		if (ptr >= (char *)(initrd_start + initrd_size))
+			return 0;
+	}
+
+	return ptr;
+}
+
+char *readfile(const char *name)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(name, ptr + 4, len))
+			return ptr + len + 8;
+	}
+	return 0;
+}
+
+uint32_t filesize(const char *name)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(name, ptr + 4, len))
+			return *((uint32_t *)ptr + len + 4);
+	}
+	return 0;
+}
+
diff --git a/initrd/calc b/initrd/calc
deleted file mode 100644
index 7359f16..0000000
--- a/initrd/calc
+++ /dev/null
@@ -1,8 +0,0 @@
-while (1) {
-	print("> ")
-	input = gets()
-	answer = solve(input)
-	print("\n")
-	print(answer)
-	print("\n")
-}
diff --git a/initrd/init b/initrd/init
index 13e5876..7359f16 100644
--- a/initrd/init
+++ b/initrd/init
@@ -1,3 +1,8 @@
-choice = filemenu
-print("\nChoice: ")
-print(choice)
+while (1) {
+	print("> ")
+	input = gets()
+	answer = solve(input)
+	print("\n")
+	print(answer)
+	print("\n")
+}
diff --git a/rba b/rba
new file mode 100755
index 0000000..52f37cb
Binary files /dev/null and b/rba differ
diff --git a/src/keypad.c b/src/keypad.c
index f76271c..5fe2537 100644
--- a/src/keypad.c
+++ b/src/keypad.c
@@ -23,17 +23,19 @@
 #include <gpio.h>
 #include <task.h>
 
-#define ROW_0 GPIO_PORT(A, 12)
-#define ROW_1 GPIO_PORT(B, 12)
-#define ROW_2 GPIO_PORT(B, 11)
-#define ROW_3 GPIO_PORT(C, 4)
-#define COL_0 GPIO_PORT(B, 13)
-#define COL_1 GPIO_PORT(B, 14)
-#define COL_2 GPIO_PORT(B, 15)
-#define COL_3 GPIO_PORT(B, 1)
-#define COL_4 GPIO_PORT(B, 2)
+#define ROW_0 GPIO_PORT(B, 2)
+#define ROW_1 GPIO_PORT(B, 1)
+#define ROW_2 GPIO_PORT(B, 15)
+#define ROW_3 GPIO_PORT(B, 14)
+#define ROW_4 GPIO_PORT(B, 13)
+#define ROW_5 GPIO_PORT(C, 4)
+#define COL_0 GPIO_PORT(B, 11)
+#define COL_1 GPIO_PORT(B, 12)
+#define COL_2 GPIO_PORT(A, 11)
+#define COL_3 GPIO_PORT(A, 12)
+#define COL_4 GPIO_PORT(C, 5)
 
-#define ROWS 4
+#define ROWS 6
 #define COLS 5
 
 typedef struct {
@@ -42,17 +44,21 @@ typedef struct {
 } port_t;
 
 static const port_t keypad_rows[ROWS] = {
-	{ ROW_0 }, { ROW_1 }, { ROW_2 }, { ROW_3 }
+	{ ROW_0 }, { ROW_1 }, { ROW_2 },
+	{ ROW_3 }, { ROW_4 }, { ROW_5 }
 };
 
 static const port_t keypad_cols[COLS] = {
-	{ COL_0 }, { COL_1 }, { COL_2 }, { COL_3 }, { COL_4 }
+	{ COL_0 }, { COL_1 }, { COL_2 },
+	{ COL_3 }, { COL_4 }
 };
 
 static const int keypad_map[ROWS][COLS] = {
-	{ '7', '8', '9',  'x',  '/' },
-	{ '4', '5', '6',  'y',  '*' },
-	{ '1', '2', '3',  '=',  '-' },
+	{ '&', '|', '^',  ' ',  ' ' },
+	{ 'x', 'y', 'z',  '=',  ' ' },
+	{ '7', '8', '9',  '(',  ')' },
+	{ '4', '5', '6',  '/',  '%' },
+	{ '1', '2', '3',  '*',  '-' },
 	{ '.', '0', '\b', '\n', '+' }
 };
 
diff --git a/src/main.c b/src/main.c
index c9d3789..d21407a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,7 +27,7 @@
 #include <initrd.h>
 #include <keypad.h>
 #include <lcd.h>
-#include <parser.h>
+#include <it/parser.h>
 #include <random.h>
 #include <script.h>
 #include <serial.h>
diff --git a/src/script.c b/src/script.c
index 518edc5..049608b 100644
--- a/src/script.c
+++ b/src/script.c
@@ -20,7 +20,7 @@
 
 #include <script.h>
 
-#include <builtins.h>
+#include <it/builtins.h>
 #include <clock.h>
 #include <display.h>
 #include <display_draw.h>
@@ -29,10 +29,9 @@
 #include <random.h>
 #include <serial.h>
 #include <stdlib.h>
+#include <it/string.h>
 #include <keypad.h>
 
-#include <string.h>
-
 #define igetarg_integer(it, n) ((int)igetarg(it, n)->value.f)
 
 int script_puts(instance *it);