diff --git a/emulator_shell.c b/emulator_shell.c
index 4d508a0..a77617f 100644
--- a/emulator_shell.c
+++ b/emulator_shell.c
@@ -7,6 +7,8 @@
 // gcc emulator_shell.c `pkg-config --cflags --libs gtk+-3.0` -o emulator
 
 #define FREQUENCY 500
+void keyDown(uint8_t key);
+void keyUp(uint8_t key);
 
 //===== GTK SETUP =====
 
@@ -74,8 +76,6 @@ static gboolean on_key_release(GtkWidget *widget, GdkEventKey *event, gpointer u
             keyUp(4);
             break;
     }
-    }
-
     return FALSE;
 }
 
@@ -625,8 +625,7 @@ int emulate8080(State8080* state) {
             uint32_t hl = (state->h << 8) | state->l;
             uint32_t result = hl + hl;
             state->h = (result & 0xff00) >> 8;
-            state->l = result & 0xff;0[*opcode];
-}
+            state->l = result & 0xff;
             state->cc.cy = ((result & 0xffff0000) != 0);
             }
             break;
@@ -810,9 +809,11 @@ int emulate8080(State8080* state) {
             state->sp += 2;
             break;
         case 0xd3:              // OUT byte
+            {
             uint8_t port = opcode[1];
             machineOut(state, port, 0x00); // PROBLEM: We need to pass a value to machineOUT
             state->pc++;
+            }
             break;
         case 0xd5:              // PUSH D
             state->memory[state->sp-1] = state->d;
@@ -820,9 +821,11 @@ int emulate8080(State8080* state) {
             state->sp -= 2;
             break;
         case 0xdb:              // IN byte
+            {
             uint8_t port = opcode[1];
             state->a = machineIn(state, port);
             state->pc++;
+            }
             break;
         case 0xe1:              // POP H
             state->l = state->memory[state->sp];
@@ -1011,6 +1014,7 @@ int main (int argc, char *argv[])  {
     read_Space_Invaders_ROM(state, "ROM/invaders.g", 0x800);
     read_Space_Invaders_ROM(state, "ROM/invaders.f", 0x1000);
     read_Space_Invaders_ROM(state, "ROM/invaders.e", 0x1800);
+    gtk_main();
 
 
 
@@ -1025,8 +1029,9 @@ int main (int argc, char *argv[])  {
 
         i++;
         simulateNanoseconds(FREQUENCY * counter); // EMULATION OF THE PROCESSOR ŠPEED
-        if ((total_count  > 10000000) && (state->int_enable))  //1/60 second has elapsed    
+        if ((total_count  > 16000000) && (state->int_enable))  //1/60 second has elapsed    
         {     
+            // draw_screen(state);
             if (which_interrupt == 2) {
                 generateInterrupt(state, 2);    //interrupt 2  
                 total_count = 0;
@@ -1038,7 +1043,7 @@ int main (int argc, char *argv[])  {
             }
         }    
     }
-    gtk_main();
+
     free(state->memory);
     free(state);
     return 0;