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Landmark XT Jumpstart

Code

Meaning

01

Jump to reset area in ROM BIOS

02

Initialize DMA page register

03

Initialize DMA refresh register

04

Clear all RAM

05

Perform RAM test on 1st 64k

06

Clear 1st 64k

07

Initialize BIOS stack to 0:FC0

08

Set the equipment flag based on switches

09

Initialize default interrupt vectors

0A

Initialize 8255 if it exists and enable parity

0B

Initialize 8259 and enable interrupts

0C

Setup adapters and peripherals

0D

Setup video

0E

Initialize video

0F

Initialize equipment

10

Initialize memory configuration in RAM (currently = 64K)

11

Setup timer function

12

Initialize timer function

13

Setup time of day function

14

Initialize time of day function

15

Setup and init print screen function

16

Setup and init cassette function

17

Setup and init bootstrap function

18

Setup and init keyboard function

19

Enable speaker

1A

Setup timer 0 for the real time clock

1B

EnabIe RTC

1C

Setup timer 2 for the beeper

1D

Size memory: write 55AA/AA55 to 1st/last word in segment

1E

Read 1st and last word of segment

1F

Compare 1st and last words

20

Report determined memory size to screen

21

Perform checksum on ROM BIOS

22

If cold boot perform complete RAM testing

23

Move system stack to bottom of memory and save pointer at 40:0E

24

Reset parity after RAM sizing

25

Enable timer and keyboard interrupts

26

Setup the serial and parallel ports

27

Setup the game port

28

Setup the floppy disk controller

29

Scan for optional ROM in 2K chunk from C8000 to start of BIOS

2A

Boot System

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