diff --git a/bochsrc.txt b/bochsrc.txt
index fe783a2..9783490 100644
--- a/bochsrc.txt
+++ b/bochsrc.txt
@@ -1,5 +1,5 @@
 megs:            32
-display_library: sdl2 
+display_library: x 
 romimage:        file=/usr/share/bochs/BIOS-bochs-legacy
 vgaromimage:     file=/usr/share/bochs/VGABIOS-lgpl-latest
 ata0-master:     type=cdrom, path=os.iso, status=inserted
diff --git a/io.s b/io.s
index bb131d9..b677e49 100644
--- a/io.s
+++ b/io.s
@@ -16,19 +16,29 @@ inb:
 global x86_div64_32
 
 x86_div64_32:
-  mov eax, [bp+8]
-  mov ecx, [bp+12]
-  xor edx, edx
-  div ecx
+    push ebp
+    mov ebp, esp
 
-  mov bx, [bp+16]
-  mov [bx+4], eax
+    ; Arguments:
+    ; [ebp + 8]  - lower 32 bits of dividend (uint32_t)
+    ; [ebp + 12] - upper 32 bits of dividend (uint32_t)
+    ; [ebp + 16] - divisor (uint32_t)
+    ; [ebp + 20] - pointer to quotient (uint64_t*)
+    ; [ebp + 24] - pointer to remainder (uint32_t*)
 
-  mov eax, [bp+4]
-  div ecx
+    mov eax, [ebp + 8]
+    mov edx, [ebp + 12]
 
-  mov [bx], eax
-  mov bx, [bp+18]
-  mov [bx], edx
+    mov ecx, [ebp + 16]
 
-  ret
+    div ecx
+    mov esi, [ebp + 20]
+    mov [esi], eax
+
+    mov dword [esi + 4], 0
+
+    mov esi, [ebp + 24]
+    mov [esi], edx
+
+    pop ebp
+    ret
\ No newline at end of file
diff --git a/iso/boot/kernel.elf b/iso/boot/kernel.elf
index a133913..5315e60 100755
Binary files a/iso/boot/kernel.elf and b/iso/boot/kernel.elf differ
diff --git a/kernel.elf b/kernel.elf
index a133913..5315e60 100755
Binary files a/kernel.elf and b/kernel.elf differ
diff --git a/kmain.c b/kmain.c
index 9e75d2b..8cd6cef 100644
--- a/kmain.c
+++ b/kmain.c
@@ -3,11 +3,31 @@
 
 int kmain(int retvalue)
 {
+
+  // serial testing
+
   init_serial();
   log("serial connection established", 3);
   log("Kernel started", 2);
 
   clear();
-  printf("Formatted: %% %c %s %d\n", 'f', "Hello", 77);
+
+  // printf testing
+
+  int age = 34;
+  int problems = 124;
+  char* name = "xamidev"; 
+  
+  printf("Hello %s, you are %d years old and have %d problems. wow %%\n", name, age, problems);
+  
+  long suchwow = 2934342;
+  char character = 65;
+  printf("such number %u\nsuch character %c", suchwow, character);
+  
+  printf("wow negative %d\n", -3742);
+  printf("such hex %x %X\n", 0xcafe, 0xdeadbeef);
+  
+  printf("such pointer %p\n", (void*)0xcafe1234);
+  
   return retvalue;
 }
diff --git a/os.iso b/os.iso
index 3af65ac..6c0640a 100644
Binary files a/os.iso and b/os.iso differ