diff --git a/src/bootloader.asm b/src/bootloader.asm
index e831fc2..101bd51 100644
--- a/src/bootloader.asm
+++ b/src/bootloader.asm
@@ -8,9 +8,12 @@
 
 	mov bx, hexTestPrefixString	; Hex print test (not needed but fun)
 	call print
+
+	pusha
 	mov dx, 0x002e ; test the conversion
 	call hexToASCII
 	call println
+	popa
 
 	jmp $  ; inf loop
 
diff --git a/src/bootloader_bios_disk.asm b/src/bootloader_bios_disk.asm
index e69de29..21e3204 100644
--- a/src/bootloader_bios_disk.asm
+++ b/src/bootloader_bios_disk.asm
@@ -0,0 +1,5 @@
+disk_read:
+	pusha
+
+	mov ah, BIOS_DISK_READ 
+	mov al, dh ; number of sectors to read
diff --git a/src/equ/BIOS.asm b/src/equ/BIOS.asm
index 1c216c7..3294bde 100644
--- a/src/equ/BIOS.asm
+++ b/src/equ/BIOS.asm
@@ -2,5 +2,6 @@
 BIOS_TTY_INT 		equ 0x10
 BIOS_TTY_MODE		equ 0x0e
 
-BIOS_READ_INT		equ 0x13
-BIOS_READ_MODE		equ 0x02
+BIOS_DISK_INT		equ 0x13
+BIOS_DISK_READ		equ 0x02
+