diff --git a/src/arch/amd64/fb.c b/src/arch/amd64/fb.c
index 5e9ea5e..ab15dd6 100644
--- a/src/arch/amd64/fb.c
+++ b/src/arch/amd64/fb.c
@@ -2,6 +2,7 @@
 #include <memory.h>
 #include <serial.h>
 #include <stdint.h>
+#include <panic.h>
 
 #include "bindings.h"
 
@@ -34,11 +35,11 @@ static uint16_t read(uint16_t value) {
     return inw(DATA);
 }
 
-int is_available(void) {
-    return (read(INDEX_ID) >= 0xB0C4);
+static int is_available(void) {
+    return (read(INDEX_ID) == 0xB0C5);
 }
 
-void set_mode(uint16_t width, uint16_t height, uint16_t bit_depth, int lfb, int clear) {
+static void set_mode(uint16_t width, uint16_t height, uint16_t bit_depth, int lfb, int clear) {
     write(INDEX_ENABLE, DATA_DISP_DISABLE);
     write(INDEX_XRES, width);
     write(INDEX_YRES, height);
@@ -48,13 +49,16 @@ void set_mode(uint16_t width, uint16_t height, uint16_t bit_depth, int lfb, int
         (clear ? 0 : DATA_NO_CLEAR_MEM));
 }
 
-void set_bank(uint16_t bank) {
-    write(INDEX_BANK, bank);
-}
+//static void set_bank(uint16_t bank) {
+//    write(INDEX_BANK, bank);
+//}
 
 int fb_init(uint16_t width, uint16_t height) {
 
 	set_mode(width, height, 32, true, true);
 
+	if (!is_available())
+		panic("bochs framebuffer not avaliable");
+
 	return 0;
 }