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Quadtel 16K XT

Code

Meaning

03

Test flag register

06

Test CPU Register

09

Initialise system hardware

0C

Test BIOS ROM checksum

0F

Initialise 8237 DMA page register

12

Test 8237 address and count registers

15

Initialise 8237 DMA

18

Test 8253 timer

1B

lnitialise 8253 timer

1E

Start memory refresh test

21

Test base 64K RAM, Cycling POST display shows POST code, the upper then lower bytes of the failing address, separated by delays

24

Set up common INT temp stack

27

lnitialize 8259 interrupt controller

2A

Test interrupt mask register

2D

Test for hot (unexpected) interrupt

30

Test V40 DMA if present

31

Test for DDNIL bits present

33

Verify system clock interrupt

36

Test keyboard

39

Set up interrupt table

3C

Read system configuration switches

3F

Test video

42

Determine COM ports available

45

Determine LPT ports available

48

Determine if game port available

4B

Display copyright message

4E

Calculate CPU speed

54

Test system memory

55

Test floppy drive

57

Initialize system before boot

5A

Call Interrupt 19 boot loader

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