diff --git a/.gitignore b/.gitignore
index e69de29..f18e76d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.o
+*.bin
+build/boot/grub/grub.cfg
+modos.iso
diff --git a/Makefile b/Makefile
index f735aea..61c4df5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,11 @@
-SRC	= 	src/kernel.c			\
-		src/string.c			\
-		src/pixel.c				\
-		src/debug.c				\
+SRC	= 	src/kernel.c				\
+		src/string.c				\
+		src/pixel.c					\
+		src/debug.c					\
+		src/font.c					\
+
+# objcopy -O elf32-i386 -B i386 -I binary assets/zap-ext-light32.psf assets/zap-ext-light32.o
+FONTS = assets/zap-ext-light32.o
 
 CFLAGS += -std=gnu99 -ffreestanding -O2 -Wall -Wextra
 CC	=	i686-elf-gcc
@@ -22,7 +26,7 @@ all: $(EXEC)
 
 $(EXEC):	${OBJ}
 	$(ASMC) $(BOOT_FILE) -o $(BOOT_BIN)
-	$(CC) -T $(LINKER_FILE) -o $(KERNEL_BIN) $(BOOT_BIN) $(OBJ) -lgcc -ffreestanding -O2 -nostdlib
+	$(CC) -T $(LINKER_FILE) -o $(KERNEL_BIN) $(BOOT_BIN) $(OBJ) $(FONTS) -lgcc -ffreestanding -O2 -nostdlib
 
 	grub-file --is-x86-multiboot $(KERNEL_BIN)
 
diff --git a/assets/zap-ext-light32.psf b/assets/zap-ext-light32.psf
new file mode 100644
index 0000000..b3e3e65
Binary files /dev/null and b/assets/zap-ext-light32.psf differ
diff --git a/include/config.h b/include/config.h
new file mode 100644
index 0000000..62a0401
--- /dev/null
+++ b/include/config.h
@@ -0,0 +1,14 @@
+/*
+** EPITECH PROJECT, 2024
+** ModOS
+** File description:
+** config.h
+*/
+
+// TODO: implement config structure instead of macros so that it can be changed at runtime
+#ifndef CONFIG_H_
+    #define CONFIG_H_
+    #define TEXT_COLOR 0xffffff
+    #define BACKGROUND_COLOR 0x111111
+
+#endif /* !CONFIG_H_ */
diff --git a/include/font.h b/include/font.h
index e962acf..8217f05 100644
--- a/include/font.h
+++ b/include/font.h
@@ -12,8 +12,8 @@
     #define PSF_FONT_MAGIC 0x864ab572
 
 typedef struct {
-    uint16_t magic; // Magic bytes for identification.
-    uint8_t fontMode; // PSF font mode.
+    uint16_t magic;        // Magic bytes for identification.
+    uint8_t fontMode;      // PSF font mode.
     uint8_t characterSize; // PSF character size.
 } psf1_header_t;
 
@@ -28,4 +28,12 @@ typedef struct {
     uint32_t width;         /* width in pixels */
 } psf_font_t;
 
+extern uint8_t _binary_zap_ext_light32_psf_start;
+extern uint8_t _binary_zap_ext_light32_psf_end;
+extern uint8_t _binary_zap_ext_light32_psf_size;
+
+void __os_putchar(unsigned short int c, int cx, int cy, uint32_t fg,
+                  uint32_t bg, psf_font_t *font, uint8_t *font_start);
+                  // , psf_font_t *font, uint8_t font_start[]);
+
 #endif /* !FONT_H_ */
diff --git a/include/pixel.h b/include/pixel.h
index 16f5294..2994d00 100644
--- a/include/pixel.h
+++ b/include/pixel.h
@@ -9,9 +9,9 @@
     #define PIXEL_H_
     #include <stdint.h>
 
-typedef uint32_t argb_t;
+typedef uint32_t argb_pixel_t;
 
-void put_pixel(uint32_t x, uint32_t y, argb_t color);
+void put_pixel(uint32_t x, uint32_t y, argb_pixel_t color);
 void clear_screen(uint32_t color);
 
 #endif /* !PIXEL_H_ */
diff --git a/include/string.h b/include/string.h
index ae55228..dcc8df2 100644
--- a/include/string.h
+++ b/include/string.h
@@ -7,5 +7,16 @@
 
 #ifndef STRING_H_
     #define STRING_H_
+    #include <stdint.h>
+    #include <stddef.h>
+    #include <stdarg.h>
+    #include "config.h"
+    #include "font.h"
+
+void putchar(uint32_t unicode_char);
+void puts(const char *str);
+void put_uint(uint32_t value);
+void put_uint_hex(uint32_t value);
+void printf(const char *format, ...);
 
 #endif /* !STRING_H_ */
diff --git a/reconnect.sh b/reconnect.sh
new file mode 100755
index 0000000..4b31621
--- /dev/null
+++ b/reconnect.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+PORT=4444
+HOST=localhost
+DELAY=1
+
+while true; do
+    clear
+    echo "Connecting to QEMU serial port at $HOST:$PORT..."
+    nc $HOST $PORT
+    echo "Disconnected from QEMU serial port."
+    echo "Reconnecting in $DELAY seconds..."
+    sleep $DELAY
+done
diff --git a/src/font.c b/src/font.c
index 3d9d501..4543121 100644
--- a/src/font.c
+++ b/src/font.c
@@ -1 +1,101 @@
 #include "../include/font.h"
+#include "../include/kernel.h"
+#include "../include/pixel.h"
+#include "stddef.h"
+
+uint16_t *unicode;
+
+// NOTE: Optional unicode decoding
+// Needs calloc which we don't have right now.
+//
+// void psf_init()
+// {
+//     uint16_t glyph = 0;
+//     psf_font_t *font = (psf_font_t*)&font_start;
+//
+//     if (font->flags) {
+//         unicode = NULL;
+//         return;
+//     }
+//
+//     char *s = (char *)(
+//     (unsigned char*)&font_start +
+//       font->headersize +
+//       font->numglyph * font->bytesperglyph
+//     );
+//     unicode = calloc(USHRT_MAX, 2);
+//     while(s>_binary_zap_ext_light32_psf_end) {
+//         uint16_t uc = (uint16_t)((unsigned char *)s[0]);
+//         if(uc == 0xFF) {
+//             glyph++;
+//             s++;
+//             continue;
+//         } else if(uc & 128) {
+//             /* UTF-8 to unicode */
+//             if((uc & 32) == 0 ) {
+//                 uc = ((s[0] & 0x1F)<<6)+(s[1] & 0x3F);
+//                 s++;
+//             } else
+//             if((uc & 16) == 0 ) {
+//                 uc = ((((s[0] & 0xF)<<6)+(s[1] & 0x3F))<<6)+(s[2] & 0x3F);
+//                 s+=2;
+//             } else
+//             if((uc & 8) == 0 ) {
+//                 uc = ((((((s[0] & 0x7)<<6)+(s[1] & 0x3F))<<6)+(s[2] &
+//                 0x3F))<<6)+(s[3] & 0x3F); s+=3;
+//             } else
+//                 uc = 0;
+//         }
+//         unicode[uc] = glyph;
+//         s++;
+//     }
+// }
+
+/**
+ * @brief Unicode putchar
+ *
+ * @param c This is an int, not char as it's a unicode character
+ * @param cx Horizontal position on screen, in characters not in pixels
+ * @param cy Vertical position on screen, in characters not in pixels
+ * @param fg ARGB foreground color
+ * @param bg ARGB background color
+ */
+void __os_putchar(
+    unsigned short int c,
+    int cx, int cy,
+    uint32_t fg, uint32_t bg,
+    psf_font_t *font,
+    uint8_t *font_start)
+{
+    uint32_t bytesperline = (font->width + 7) / 8;
+
+    if (unicode != NULL) {
+        c = unicode[c];
+    }
+
+    uint8_t *glyph =
+        (uint8_t *)font_start + font->headersize +
+        (c > 0 && c < font->numglyph ? c : 0) * font->bytesperglyph;
+    uint32_t offset = (cy * font->height * framebuffer_pitch) +
+        (cx * font->width * sizeof(argb_pixel_t));
+
+    for (uint32_t y = 0; y < font->height; y++) {
+        uint32_t line = offset;
+        uint8_t *glyph_row = glyph + y * bytesperline;
+        uint32_t bits_left = font->width;
+
+        for (uint32_t b = 0; b < bytesperline; b++) {
+            uint8_t byte = glyph_row[b];
+
+            for (int bit = 7; bit >= 0 && bits_left > 0; bit--) {
+                uint32_t color = (byte & (1 << bit)) ? fg : bg;
+
+                *((argb_pixel_t *)(framebuffer + line)) = color;
+
+                line += sizeof(argb_pixel_t);
+                bits_left--;
+            }
+        }
+        offset += framebuffer_pitch;
+    }
+}
diff --git a/src/kernel.c b/src/kernel.c
index e41b41a..e5a336c 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -13,11 +13,12 @@
 #include "../include/kernel.h"
 #include "../include/multiboot.h"
 #include "../include/pixel.h"
+#include "../include/config.h"
+#include "../include/string.h"
 
 /* Check if the compiler thinks you are targeting the wrong operating system. */
 #if defined(__linux__)
-#error                                                                         \
-    "You are not using a cross-compiler, you will most certainly run into trouble"
+#error "You are not using a cross-compiler, you will most certainly run into trouble"
 #endif
 
 /* This tutorial will only work for the 32-bit ix86 targets. */
@@ -55,5 +56,7 @@ void kernel_main(unsigned long magic, multiboot_info_t *mbi) {
     framebuffer_height = mbi->framebuffer_height;
     framebuffer_bpp    = mbi->framebuffer_bpp;
 
-    clear_screen(0xffff0000);
+    clear_screen(BACKGROUND_COLOR);
+
+    printf("Hello %d\n", 42);
 }
diff --git a/src/pixel.c b/src/pixel.c
index 2ca077d..0bd90ba 100644
--- a/src/pixel.c
+++ b/src/pixel.c
@@ -24,7 +24,7 @@ static inline uint32_t position(uint32_t x, uint32_t y)
  * x and y indicate the pixel position
  * color is a 32 bit unsigned integer such as 0xAARRGGBB
  */
-void put_pixel(uint32_t x, uint32_t y, argb_t color)
+void put_pixel(uint32_t x, uint32_t y, argb_pixel_t color)
 {
     const uint32_t index = position(x, y);
 
@@ -52,7 +52,7 @@ void put_pixel(uint32_t x, uint32_t y, argb_t color)
     }
 }
 
-void clear_screen(argb_t color)
+void clear_screen(argb_pixel_t color)
 {
     for (uint32_t y = 0; y < framebuffer_height; ++y) {
         for (uint32_t x = 0; x < framebuffer_width; ++x) {
diff --git a/src/string.c b/src/string.c
index 0dafc30..d4eb39e 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1,4 +1,93 @@
 #include "../include/string.h"
+#include "../include/kernel.h"
 
-void putchar(char c) {
+uint32_t cx, cy = 0;
+psf_font_t *font = (psf_font_t *)&_binary_zap_ext_light32_psf_start;
+
+void putchar(uint32_t unicode_char)
+{
+    if (unicode_char == '\n') {
+        cx = 0; ++cy;
+        return;
+    }
+    __os_putchar(unicode_char, cx, cy, TEXT_COLOR, BACKGROUND_COLOR, font, (uint8_t *)&_binary_zap_ext_light32_psf_start);
+    if (++cx > (uint32_t)framebuffer_pitch / font->bytesperglyph) {
+        cx = 0; ++cy;
+    }
+}
+
+void put_uint(uint32_t value)
+{
+    char buffer[11];
+    int i = 10;
+    buffer[i] = '\0';
+
+    if (value == 0) {
+        putchar('0');
+        return;
+    }
+
+    while (value > 0 && i > 0) {
+        buffer[--i] = '0' + (value % 10);
+        value /= 10;
+    }
+
+    puts(&buffer[i]);
+}
+
+
+void put_uint_hex(uint32_t value)
+{
+    char buffer[9];
+    const char *hex_chars = "0123456789abcdef";
+    int i = 8;
+    buffer[i] = '\0';
+
+    if (value == 0) {
+        puts("0x0");
+        return;
+    }
+
+    while (value > 0 && i > 0) {
+        buffer[--i] = hex_chars[value & 0xF];
+        value >>= 4;
+    }
+
+    puts("0x");
+    puts(&buffer[i]);
+}
+
+void printf(const char *format, ...)
+{
+    va_list params; va_start(params, format);
+    for (uint32_t i = 0; format[i] != '\0'; ++i) {
+        if (!(format[i] == '%')) {
+            putchar(format[i]);
+            continue;
+        }
+        switch (format[++i]) {
+        case 'd': // idc for now
+        case 'u':
+            put_uint((uint32_t)va_arg(params, uint32_t));
+            break;
+        case 'x':
+            put_uint_hex((uint32_t)va_arg(params, uint32_t));
+            break;
+        case 'c':
+            putchar((uint8_t)va_arg(params, uint32_t));
+            break;
+        case 's':
+            puts((char *)va_arg(params, char *));
+            break;
+        default:
+            putchar(format[i]);
+            break;
+        }
+    }
+    va_end(params);
+}
+
+void puts(const char *str)
+{
+    for (uint32_t i = 0; str[i] != '\0'; ++i) putchar(str[i]);
 }