int 0x13 ah = 0x08

bloodhound23 · Post by **bloodhound23** » Tue Feb 05, 2008 6:46 am

int the interrupt list, what does it mean when it says "CL = maximum sector number(5-0)" specifically the 5-0 part.

Cemre · Post by **Cemre** » Tue Feb 05, 2008 6:59 am

CL = maximum sector number (bits 5-0)
high two bits of maximum cylinder number (bits 7-6)

CH = low eight bits of maximum cylinder number

low 6 bits of CL contain maximum sector number
high 2 bits of CL contain higher 2 bits of maximum cylinder number

that is; max cylinder number is actually 10 bit..
8 bits in CH, 2 bits in CL

max sector number is only a 6bit field.

let's say CHS = 257:2:63

CL[0..5] = 63

CL[6,7] = 01b
CH[0..7] = 00000001b

Cylinder is 01 combined with 00000001b -> 0100000001b = 257

bloodhound23 · Post by **bloodhound23** » Tue Feb 05, 2008 7:26 am

thanks

bloodhound23 · Post by **bloodhound23** » Wed Feb 06, 2008 2:11 pm

I'm confused on how I might extract these values to use in LBACHS.