Boot program in assembly...

Hey there, im Galo, im new here on the board i have some programming experience and im studying assembly right now.

Since there is no assembly forum here i decided to post it at the c++ forum.

what i needed to know was, does anyone knows the BIOS Interupt port for the cdRom, i know 10H is the video interupt and i looked on google but could not find anything....

edit : hey i found a thread with the following message in it : If you want to get into compiler design check out the red dragon book, do a search on this board for other books, or *gasp* try google.

Im lookin for this book for a while now, the only prper link i found whas http://www.jargon.net/jargonfile/d/DragonBook.html which does not give me any decent info on the book, is there a version of this book online that anyone knows, does anyone has this book in pdf format ?

i looked in the local bookstore here but they dont have it in theire register, does anyone has an ISBN number or anything i need this baby....

thanks in advance,
Galo

1st line of text in your link "ISBN 0-201-10088-6", if you actually read it seems theres more then one 'Dragon Book'.

OMG, how stupid am i :-) thanks totaly looked over that.... my bad

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Originally Posted by Galo

Hey there, im Galo, im new here on the board i

what i needed to know was, does anyone knows the BIOS Interupt port for the cdRom, i know 10H is the video interupt and i looked on google but could not find anything....

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Did you check Ralph Brown's Interrupt List

I recommend "The Art of Assembly Language". Sorry, i don't have a link to it, a google search should work

http://forums.entropysink.com/forumdisplay.php?f=12

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Originally Posted by Quantum1024

Did you check Ralph Brown's Interrupt List

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Thanks, this was exactly what i was looking for.

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I recommend "The Art of Assembly Language". Sorry, i don't have a link to it, a google search should work

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I have the books but they dont come with these lists...

Thanks again ppl..
Galo

int 2Fh is where the CD-ROM driver usually hooks itself. The multi-plex 2Fh interrupt is used for all types of other devices as well. Also if you are not in pure DOS I would not count on any type of assembly code that attempts to use a CD-ROM driver on int 2Fh working correctly.

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Originally Posted by Bubba

int 2Fh is where the CD-ROM driver usually hooks itself. The multi-plex 2Fh interrupt is used for all types of other devices as well. Also if you are not in pure DOS I would not count on any type of assembly code that attempts to use a CD-ROM driver on int 2Fh working correctly.

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Cool but what about a boot program that sits on a cdrom.... is it say posible to address the CDRom interupt from the CdRom it'sself just like when you install Windows/Linux f.e.

Or sould one address the BOIS Interupts for that cause since there would ne OS installed, not even DOS.

btw otherwise you would have to provide the drivers for that on the cdrom as well no ?

Bootable CD-ROMs, eh? Sounds like you're gonna be in for some fun... :rolleyes:

Simply put, when you initially boot a computer there is NO CD-ROM driver or anything like that. The way bootable CD-ROMs work is that they either utilise a special function of the BIOS (known as ATAPI Floppy Disk emulation) or, in the case of Windows, immediately install their own CD-ROM driver.

Most people choose to use floppy disk emulation because it's an awful lot easier to work with: the BIOS "pretends" that part of your CD-ROM is a floppy disk and treats it as such. You can write a boot sector just like you would on a floppy disk and it works fine. You can put DOS in the disk area and load MSCDEX, that would give you full access to the CD, but the floppy disk emulation will still be running, which can be awkward with certain programs.

Of course, you can just ignore all that and install your own driver. This will mean that all that will happen on boot is the boot sector of the CD being read; the computer won't know anything else about the disc and you won't be able to go any further with it until you tell it to e.g. scan the IDE interface for attached drives, find the CD-ROM drive, communicate directly with it, etc.

Needless to say, one's very easy and the other's very hard. It's up to you if you want the challenge. ;)