diff --git a/Readme.md b/Readme.md
index c262a65..57ae4ec 100644
--- a/Readme.md
+++ b/Readme.md
@@ -46,3 +46,6 @@ INT_NUM     |   Short Description PM
 0x13        |  SIMD Floating-Point Exception
 0x14        |  Virtualization Exception
 0x15        |  Control Protection Exception
+
+== BIOS IRQ ==
+https://en.wikipedia.org/wiki/BIOS_interrupt_call
diff --git a/mbr.asm b/mbr.asm
index 57f5a12..3103f0d 100644
--- a/mbr.asm
+++ b/mbr.asm
@@ -1,4 +1,7 @@
 bits 16				; mode 16bits
 org 0x7C00			; mbr ae loaded at 0x7C00
+mov al, 41h         ; put 'A' in al
+mov ah, 0eh         ; we want to call function 09h (Write Character and Attribute at Cursor) from interupt 10h
+int 10h
 times 510 - ($ - $$) db 0	; fill up to 510 with 0
 dw 0xAA55			; MBR magic number