diff --git a/control.c b/control.c
index 767a5b3..2dc20b6 100644
--- a/control.c
+++ b/control.c
@@ -10,25 +10,29 @@
 
 #include "globals.h"
 
-void interrupt (*old_keyboard)();
+void interrupt (*old_keyboard)(void);
 
 void interrupt my_keyboard(void)
 {
-    int key = inportb(0x60);
+    int key;
+
+    key = inportb(0x60);
     outportb(0x20, 0x20);
-    if (key & 0x80)
+
+    if (key & 0x80) {
         keytab[key - 0x80] = 0;
-    else
+    }
+    else {
         keytab[key] = 1;
+    }
 }
 
 void init_keyboard(void)
 {
-    int x;
     old_keyboard = getvect(9);
     setvect(9, my_keyboard);
-    for (x = 0; x < 256; x++)
-        keytab[x] = 0;
+   
+    memset(keytab, 0, 256);
 }
 
 void restore_keyboard(void)