int 0x13 ah = 0x08
Posted: 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.
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