Code

Meaning

1-5

Keyboard controller

06

On board LSI

07

CPU

8-0E

CMOS; 8254; 8237; 8259; EPROM

0F

Extended CMOS

10-14

Refresh

15

First 64K RAM

16

Interrupt vector tables

17

Video initialisation

18

Video memory

19-1A

Interrupt line mask

1B

Battery good

1C

CMOS checksum

1D

CMOS chip

1E

Memory size

1F

Memory verifier

20-23

CPU support chips

24

Extended memory size

25

Extended memory size

26

Protected mode

27-28

Shadow RAM

29

Reserved

2A

Initialise keyboard

2B

Floppy drive initialisation

2C

Serial port initialisation

2D

Parallel port initialisation

2E

Hard disk initialisation

2F

Maths coprocessor

30

Reserved

31

Optional ROMs

FF

Boot