diff --git a/include/gpio.h b/include/gpio.h
index 58ebaa7..08feb86 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -83,7 +83,7 @@ void gpio_init(void);
  * @param pupd pullup/pulldown enable
  * @see GPIO_PUPD
  */
-void gpio_pupd(GPIO_TypeDef *port, uint8_t pin, uint8_t pupd);
+void gpio_pupd(GPIO_TypeDef *port, uint32_t pin, uint32_t pupd);
 
 /**
  * Sets whether to use push-pull or open drain for the given pin.
@@ -92,7 +92,7 @@ void gpio_pupd(GPIO_TypeDef *port, uint8_t pin, uint8_t pupd);
  * @param type what to use
  * @see GPIO_TYPE
  */
-void gpio_type(GPIO_TypeDef *port, uint8_t pin, uint8_t type);
+void gpio_type(GPIO_TypeDef *port, uint32_t pin, uint32_t type);
 
 /**
  * Sets the pin's speed.
@@ -101,7 +101,7 @@ void gpio_type(GPIO_TypeDef *port, uint8_t pin, uint8_t type);
  * @param speed the speed to use
  * @see GPIO_SPEED
  */
-void gpio_speed(GPIO_TypeDef *port, uint8_t pin, uint8_t speed);
+void gpio_speed(GPIO_TypeDef *port, uint32_t pin, uint32_t speed);
 
 /**
  * Sets the pin's i/o mode.
@@ -110,7 +110,7 @@ void gpio_speed(GPIO_TypeDef *port, uint8_t pin, uint8_t speed);
  * @param mode the mode to use
  * @see GPIO_MODE
  */
-void gpio_mode(GPIO_TypeDef *port, uint8_t pin, uint8_t mode);
+void gpio_mode(GPIO_TypeDef *port, uint32_t pin, uint32_t mode);
 
 /**
  * Sets the state of a digital output pin.
@@ -118,7 +118,7 @@ void gpio_mode(GPIO_TypeDef *port, uint8_t pin, uint8_t mode);
  * @param pin the pin
  * @param val non-zero for high, zero for low
  */
-void gpio_dout(GPIO_TypeDef *port, uint8_t pin, uint8_t val);
+void gpio_dout(GPIO_TypeDef *port, uint32_t pin, uint32_t val);
 
 /**
  * Reads a digital input pin.
@@ -126,6 +126,6 @@ void gpio_dout(GPIO_TypeDef *port, uint8_t pin, uint8_t val);
  * @param pin the pin
  * @return non-zero for high, zero for low
  */
-uint8_t gpio_din(GPIO_TypeDef *port, uint8_t pin);
+uint32_t gpio_din(GPIO_TypeDef *port, uint32_t pin);
 
 #endif // GPIO_H_
diff --git a/initrd/init b/initrd/init
index 17eb48d..7359f16 100644
--- a/initrd/init
+++ b/initrd/init
@@ -1,8 +1,8 @@
-input = 0
 while (1) {
-	while (input == 0) {
-		input = getkey
-	}
-	print(input)
-	input = 0
+	print("> ")
+	input = gets()
+	answer = solve(input)
+	print("\n")
+	print(answer)
+	print("\n")
 }
diff --git a/libinterp.a b/libinterp.a
index f009932..a485352 100644
Binary files a/libinterp.a and b/libinterp.a differ
diff --git a/link.ld b/link.ld
index b7adb78..231269a 100644
--- a/link.ld
+++ b/link.ld
@@ -41,8 +41,8 @@ SECTIONS {
 		*(.text)
 		*(.text*)
 
-		*(.init)
-		*(.fini)
+		KEEP(*(.init))
+		KEEP(*(.fini))
 		. = ALIGN(8);
 	} > FLASH
 
@@ -64,14 +64,14 @@ SECTIONS {
 	/* init_array/fini_array (TODO understand this) */
 	.init_array : {
 		__init_array_start = .;
-		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array.*))
 		KEEP(*(.init_array*))
 		__init_array_end = .;
 	} > FLASH
 
 	.fini_array : {
 		__fini_array_start = .;
-		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array.*))
 		KEEP(*(.fini_array*))
 		__fini_array_end = .;
 	} > FLASH
@@ -88,10 +88,10 @@ SECTIONS {
 
 	/* uninitialized data */
 	.bss : {
-		. = ALIGN(4);
+		. = ALIGN(8);
 		__bss_start__ = .;
 		*(.bss)
-		. = ALIGN(4);
+		. = ALIGN(8);
 		__bss_end__ = .;
 	} > RAM
 }
diff --git a/src/gpio.c b/src/gpio.c
index 2e50e88..db67465 100644
--- a/src/gpio.c
+++ b/src/gpio.c
@@ -26,36 +26,36 @@ void gpio_init(void)
 	RCC->AHB2ENR |= 0xFF;
 }
 
-void gpio_pupd(GPIO_TypeDef *port, uint8_t pin, uint8_t pupd)
+void gpio_pupd(GPIO_TypeDef *port, uint32_t pin, uint32_t pupd)
 {
 	port->PUPDR &= ~(0x03 << (2 * pin));
 	port->PUPDR |= pupd << (2 * pin);
 }
 
-void gpio_speed(GPIO_TypeDef *port, uint8_t pin, uint8_t speed)
+void gpio_speed(GPIO_TypeDef *port, uint32_t pin, uint32_t speed)
 {
 	port->OSPEEDR &= ~(0x03 << (2 * pin));
 	port->OSPEEDR |= speed << (2 * pin);
 }
 
-void gpio_type(GPIO_TypeDef *port, uint8_t pin, uint8_t type)
+void gpio_type(GPIO_TypeDef *port, uint32_t pin, uint32_t type)
 {
 	port->OTYPER &= ~(1 << pin);
 	port->OTYPER |= type << pin;
 }
 
-void gpio_mode(GPIO_TypeDef *port, uint8_t pin, uint8_t mode)
+void gpio_mode(GPIO_TypeDef *port, uint32_t pin, uint32_t mode)
 {
 	port->MODER &= ~(0x03 << (2 * pin));
 	port->MODER |= mode << (2 * pin);
 }
 
-void gpio_dout(GPIO_TypeDef *port, uint8_t pin, uint8_t val)
+void gpio_dout(GPIO_TypeDef *port, uint32_t pin, uint32_t val)
 {
 	port->BSRR |= (1 << (val ? pin : pin + 16));
 }
 
-uint8_t gpio_din(GPIO_TypeDef *port, uint8_t pin)
+uint32_t gpio_din(GPIO_TypeDef *port, uint32_t pin)
 {
 	return port->IDR & (1 << pin);
 }
diff --git a/src/keypad.c b/src/keypad.c
index 20a67c2..f76271c 100644
--- a/src/keypad.c
+++ b/src/keypad.c
@@ -23,15 +23,15 @@
 #include <gpio.h>
 #include <task.h>
 
-#define ROW_0 GPIO_PORT(B, 15)
-#define ROW_1 GPIO_PORT(B, 14)
-#define ROW_2 GPIO_PORT(B, 13)
+#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, 1)
-#define COL_1 GPIO_PORT(B, 2)
-#define COL_2 GPIO_PORT(B, 11)
-#define COL_3 GPIO_PORT(B, 12)
-#define COL_4 GPIO_PORT(A, 11)
+#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 ROWS 4
 #define COLS 5
@@ -49,43 +49,43 @@ static const port_t keypad_cols[COLS] = {
 	{ 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',  '*' },
-//	{ '3', '2', '1',  'z',  '-' },
-//	{ '.', '0', '\b', '\n', '+' }
-//};
+static const int keypad_map[ROWS][COLS] = {
+	{ '7', '8', '9',  'x',  '/' },
+	{ '4', '5', '6',  'y',  '*' },
+	{ '1', '2', '3',  '=',  '-' },
+	{ '.', '0', '\b', '\n', '+' }
+};
 
 #define BUFFER_SIZE 8
-static char keypad_buffer = 'A';//[BUFFER_SIZE];
+static char keypad_buffer = 0;//[BUFFER_SIZE];
 //static int keypad_buffer_pos = -1;
 
 void keypad_task(void)
 {
-	//unsigned int col = 0;
+	unsigned int col = 0;
 	while (1) {
-	//	gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 1);
-	//	for (unsigned int row = 0; row < ROWS; row++) {
-	//		if (gpio_din(keypad_rows[row].port, keypad_rows[row].pin)) {
-	//			//if (keypad_buffer_pos < BUFFER_SIZE)
-	//				keypad_buffer/*[++keypad_buffer_pos]*/ = keypad_map[row][col];
-	//			while (gpio_din(keypad_rows[row].port, keypad_rows[row].pin))
-	//				delay(1);
-	//			break;
-	//		}
-	//	}
-	//	gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 0);
-	//	col++;
-	//	if (col == COLS)
-	//		col = 0;
-
+		gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 1);
 		delay(10);
+		for (unsigned int row = 0; row < ROWS; row++) {
+			if (gpio_din(keypad_rows[row].port, keypad_rows[row].pin)) {
+				//if (keypad_buffer_pos < BUFFER_SIZE)
+					keypad_buffer/*[++keypad_buffer_pos]*/ = keypad_map[row][col];
+				while (gpio_din(keypad_rows[row].port, keypad_rows[row].pin))
+					delay(1);
+				break;
+			}
+		}
+
+		gpio_dout(keypad_cols[col].port, keypad_cols[col].pin, 0);
+		col++;
+		if (col == COLS)
+			col = 0;
 	}
 }
 
 void keypad_init(void)
 {
-	for (uint8_t i = 0; i < ROWS; i++) {
+	for (int i = 0; i < ROWS; i++) {
 		GPIO_TypeDef *p = keypad_rows[i].port;
 		uint16_t pin = keypad_rows[i].pin;
 		gpio_mode(p, pin, OUTPUT);
@@ -95,7 +95,7 @@ void keypad_init(void)
 		gpio_pupd(p, pin, PULLDOWN);
 	}
 
-	for (uint8_t i = 0; i < COLS; i++) {
+	for (int i = 0; i < COLS; i++) {
 		GPIO_TypeDef *p = keypad_cols[i].port;
 		uint16_t pin = keypad_cols[i].pin;
 		gpio_mode(p, pin, OUTPUT);
diff --git a/src/keypad.c.bak b/src/keypad.c.bak
deleted file mode 100644
index 2fbefff..0000000
--- a/src/keypad.c.bak
+++ /dev/null
@@ -1,72 +0,0 @@
-/**
- * @file keypad.c
- * Manages the GPIO keypad using IO expanders
- *
- * Copyright (C) 2018 Clyne Sullivan
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-#include <stm32l476xx.h>
-#include <gpio.h>
-
-#define ADDR 0x20
-
-#define CONTROL 0x41
-#define ADDRESS 0x12
-
-void keypad_init(void)
-{
-	// clock init
-	RCC->CCIPR &= ~(RCC_CCIPR_I2C1SEL_Msk);
-	RCC->CCIPR |= 2 << RCC_CCIPR_I2C1SEL_Pos; 
-	RCC->APB1ENR1 |= RCC_APB1ENR1_I2C1EN;
-
-	// set times
-	// PRESC, SCLDEL, SDADEL, SCLH, SCLL
-	I2C1->TIMINGR = (0 << 28) | (2 << 20) | (0 << 16) | (2 << 8) | 4;
-
-	// gpio init
-	gpio_mode(GPIOB, 8, ALTERNATE);
-	gpio_mode(GPIOB, 9, ALTERNATE);
-	GPIOB->AFR[1] &= ~(0xFF);
-	GPIOB->AFR[1] |= 0x44;
-
-	// go go go
-	I2C1->CR1 |= I2C_CR1_PE;
-
-	I2C1->CR2 |= ADDR << 1;
-	//I2C1->CR2 |= I2C_CR2_RD_WRN;
-	I2C1->CR2 &= ~(I2C_CR2_NBYTES);
-	I2C1->CR2 |= 1 << I2C_CR2_NBYTES_Pos;
-	I2C1->CR2 |= I2C_CR2_RELOAD;
-	I2C1->CR2 |= I2C_CR2_START;
-
-	while (!(I2C1->ISR & I2C_ISR_TXE));
-
-	I2C1->TXDR = ADDRESS;
-
-	while (I2C1->ISR & I2C_ISR_BUSY);
-
-	I2C1->ICR |= 0x30;
-	I2C1->CR2 |= I2C_CR2_RD_WRN;
-	I2C1->CR2 |= I2C_CR2_RELOAD;
-	I2C1->CR2 |= I2C_CR2_START;
-	
-	while (1) {
-		while (!(I2C1->ISR & I2C_ISR_RXNE));
-		uint32_t v = I2C1->RXDR;
-		(void)v;
-	}
-}
diff --git a/src/script.c b/src/script.c
index be0fa37..0ce5509 100644
--- a/src/script.c
+++ b/src/script.c
@@ -35,6 +35,7 @@
 #define igetarg_integer(it, n) ((int)igetarg(it, n)->value.f)
 
 int script_puts(instance *it);
+int script_putchar(instance *it);
 int script_gets(instance *it);
 int script_delay(instance *it);
 int script_rect(instance *it);
@@ -49,6 +50,7 @@ int script_menu(instance *it);
 void script_loadlib(instance *it)
 {
 	inew_cfunc(it, "print", script_puts);
+	inew_cfunc(it, "putchar", script_putchar);
 	inew_cfunc(it, "gets", script_gets);
 	inew_cfunc(it, "getkey", script_getkey);
 	inew_cfunc(it, "ppos", script_ppos);
@@ -86,7 +88,7 @@ int script_puts(instance *it)
 	variable *v = igetarg(it, 0);
 	if (v->type == NUMBER) {
 		char buf[33];
-		snprintf(buf, 33, "%f", v->value.f);
+		snprintf(buf, 33, "%d", (int)v->value.f); // TODO
 		dsp_puts(buf);
 	} else if (v->type == STRING) {
 		dsp_puts((const char *)v->value.p);
@@ -94,6 +96,18 @@ int script_puts(instance *it)
 	return 0;
 }
 
+int script_putchar(instance *it)
+{
+	variable *v = igetarg(it, 0);
+	char buf[2];
+	
+	buf[0] = (int)v->value.f;
+	buf[1] = '\0';
+	dsp_puts(buf);
+
+	return 0;
+}
+
 int script_gets(instance *it)
 {
 	char *s = malloc(64);
@@ -101,7 +115,11 @@ int script_gets(instance *it)
 	int index = 0;
 
 	do {
-		c[0] = serial_get();
+		do {
+			c[0] = keypad_get();
+			delay(1);
+		} while (c[0] == 0);
+		//c[0] = serial_get();
 		s[index] = c[0];
 		if (c[0] == '\b' || c[0] == 127) {
 			index--;
@@ -109,10 +127,10 @@ int script_gets(instance *it)
 				dsp_puts("\b");
 				index--;
 			}
-		} else if (c[0] != '\r') {
+		} else if (c[0] != '\n'/*'\r'*/) {
 			dsp_puts(c);
 		}
-	} while (s[index] != '\r' && index++ < 63);
+	} while (s[index] != '\n'/*'\r'*/ && index++ < 63);
 	s[index] = '\0';
 
 	variable *r = make_vars(0, s);