diff --git a/src/bpb.inc b/src/bpb.inc
new file mode 100644
index 0000000..285c665
--- /dev/null
+++ b/src/bpb.inc
@@ -0,0 +1,19 @@
+; BIOS parameter block
+; We use DOS 3.31 version as common denominator
+
+; Offset into boot sector
+BPBOFF	equ 0xB
+
+BPBSS	equ 0 ; word bytes per sector
+BPBSC	equ 2 ; byte sectors per cluster
+BPBRSC	equ 3 ; word reserved sector count
+BPBFN	equ 5 ; byte number of fat tables
+BPBRDE	equ 6 ; word root disk entries
+BPBTS	equ 8 ; word total sectors
+BPBMD	equ 10 ; byte media descriptor byte
+BPBFS	equ 11 ; word sectors per fat
+BPBSPT	equ 13 ; word sectors per track
+BPBNOS	equ 15 ; word number of sides/heads
+BPBHS	equ 17 ; dword partition offset
+BPBLTS	equ 21 ; dword large total sectors
+BPBSIZ	equ 25 ; size in bytes