diff --git a/Makefile b/Makefile
index 2600c58..9f66305 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ QEMU = qemu-system-$(QEMU_ARCH)
 QEMU_ARGS = $(addprefix --option-rom ,$(ROMS))
 
 NASM = nasm
-NASM_ARGS = -s -I. -Ilib -w-macro-params -DFLOPPY=$(FLOPPY)
+NASM_ARGS = -s -I. -Iinc -w-macro-params -DFLOPPY=$(FLOPPY)
 
 EMUL = utils/emul
 
diff --git a/inc/bpb.inc b/inc/bpb.inc
new file mode 100644
index 0000000..01f2f51
--- /dev/null
+++ b/inc/bpb.inc
@@ -0,0 +1,29 @@
+; DOS 3.31 Bios Parameter Block
+bpb_ss:	  equ 0x00 ; WORD sector size
+bpb_sc:	  equ 0x02 ; BYTE sector / cluster
+bpb_rsc:  equ 0x03 ; WORD reserved sector count
+bpb_fn:	  equ 0x05 ; BYTE fat number
+bpb_rde:  equ 0x06 ; WORD root dir entries
+bpb_ts:	  equ 0x08 ; WORD total sectors
+bpb_md:   equ 0x0A ; BYTE media descriptor
+bpb_sf:	  equ 0x0B ; WORD sectors / fat
+bpb_spt:  equ 0x0D ; WORD sectors per track
+bpb_nos:  equ 0x0F ; WORD number of sides
+bpb_po:   equ 0x11 ; DWORD partition offset
+bpb_lts:  equ 0x15 ; DWORD large total sectors
+
+; DOS 4.0 Extended Bios Parameter Block
+bpb4_dn:  equ 0x19 ; BYTE drive number
+bpb4_sig: equ 0x1B ; BYTE 29h
+bpb4_ser: equ 0x1C ; DWORD serial
+
+; DOS 7.1 Extended Bios Parameter Block
+bpb7_lsf: equ 0x19 ; DWORD large sectors / fat
+bpb7_rdc: equ 0x21 ; DWORD root directory cluster
+bpb7_fsc: equ 0x25 ; WORD fsinfo sector
+bpb7_bsc: equ 0x27 ; WORD backup boot sector
+bpb7_dn:  equ 0x35 ; BYTE drive number
+bpb7_sig: equ 0x37 ; BYTE 28h or 29h
+bpb7_ser: equ 0x38 ; DWORD serial
+
+bpb_len:  equ 0x4F