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Award XT 8088/86 BIOS v3.1

Code

Meaning

01

Processor test 1; processor status verification

02

Determine type of POST test. Failed if keyboard interface buffer filled with data.

06

Init 8259 PIC and 8237 DMA controller chips. Disable colour and mono video, parity circuits and DMA chips. Reset math coprocessor. Initialise 8253 Timer channel 1. Clear DMA chip and page registers.

07

Processor test #2. Write, read and verify all registers except SS, SP and BP with data patterns 00 and FF.

09

EPROM checksum for 32 Kbytes

0A

Initialize video controller 6845 registers as follows: 25 lines x 80 columns, first cursor scan line at 6/11 and last at 7/12, reset display offset to 0.

15

Test 1st 64K of system memory

16

Setup interrupt vector table in 1st 64K

17

Setup video I/O operations

18

Test video memory

19

Test 8259 channel 1 mask bits

1A

Test 8259 channel 2 mask bits

1D

Setup configuration byte from CMOS

1E

Sizing system memory & compare w/CMOS

1F

Test found system memory

20

Test stuck 8259's interrupt bits

21

Test stuck NMI (parity/IO chk) bits

22

Test 8259 interrupt functionality

2A

Initialise keyboard

2B

Initialise floppy controller and drive

2C

Initialise COM ports

2D

Initialised LPT ports

2F

Initialise maths coprocessor

31

Initialise option ROMs

FF

Int 19 Boot attempt

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