diff --git a/NesUEFI/NesUEFI.img b/NesUEFI/NesUEFI.img
index 6f7ad4c..e8aafd9 100644
Binary files a/NesUEFI/NesUEFI.img and b/NesUEFI/NesUEFI.img differ
diff --git a/NesUEFI/hal/nes.h b/NesUEFI/hal/nes.h
index 16d51e8..2750bd4 100644
--- a/NesUEFI/hal/nes.h
+++ b/NesUEFI/hal/nes.h
@@ -1,7 +1,7 @@
 #define NES_FPS 			60
 #define NES_SCREEN_WIDTH 	256
 #define NES_SCREEN_HEIGHT 	240
-#define NES_SCREEN_ZOOM 	2
+#define NES_SCREEN_ZOOM 	1.5
 
 #define KEY_A			37	// k
 #define KEY_B			36	// j
diff --git a/NesUEFI/main.efi b/NesUEFI/main.efi
index 85ced30..7eb0fac 100755
Binary files a/NesUEFI/main.efi and b/NesUEFI/main.efi differ
diff --git a/OVMF/OVMF_VARS-pure-efi.fd b/OVMF/OVMF_VARS-pure-efi.fd
index d04a27a..a465fde 100644
Binary files a/OVMF/OVMF_VARS-pure-efi.fd and b/OVMF/OVMF_VARS-pure-efi.fd differ
diff --git a/README.md b/README.md
index 8573e34..c9e4434 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,7 @@ Below games are currently tested on real hardware. But NesUEFI is not only limit
 - https://wiki.osdev.org/GNU-EFI
 - https://wiki.osdev.org/UEFI_App_Bare_Bones
 - https://wiki.osdev.org/Loading_files_under_UEFI
+- https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf
 - https://github.com/NJU-ProjectN/LiteNES
 - https://learn.adafruit.com/adafruit-gfx-graphics-library
 - https://edk2-devel.narkive.com/WhxSiG6I/edk2-directory-file-system-traversal-example