This question concerns loading sectors from disk via int 13/AH=02. My problem is that the register cl, which holds the value of the sector to be load into memory only allows values in the range 0-63. If I would like to load sector 100 from the disk into memory how would i go about doing this? My guess is that I would use CHS translation to load the desired sector. If this is correct could someone please explain to me with an example how i would use this method to obtain the correct sector. If not please let me know how this could me done.
thank you
MWM
int 13/AH=02
-
carbonBased
RE:int 13/AH=02
cylinder = LBA / (heads_per_cylinder * sectors_per_track)
temp = LBA % (heads_per_cylinder * sectors_per_track)
head = temp / sectors_per_track
sector = temp % sectors_per_track + 1
LBA = logical/large block access, ie. your 32-bit sector number
You'll have to get the drive parameters from the IDE controller, or a BIOS call (unless you know them before hand, perhaps; like a 1.44mb floppy)
PS: That's the _FIRST_ link that pops up on a search for CHS translation (your own words!) on Google. Did you even try to find this info yourself?
Jeff
temp = LBA % (heads_per_cylinder * sectors_per_track)
head = temp / sectors_per_track
sector = temp % sectors_per_track + 1
LBA = logical/large block access, ie. your 32-bit sector number
You'll have to get the drive parameters from the IDE controller, or a BIOS call (unless you know them before hand, perhaps; like a 1.44mb floppy)
PS: That's the _FIRST_ link that pops up on a search for CHS translation (your own words!) on Google. Did you even try to find this info yourself?
Jeff