Using interrupts is really fun. The interrupts give the absoulte power to the programer. The bios routine can directly be executed. things like accesing the flopy in low leve and reading sector by sector. Reading the time from bios CMOS.
in order to execute a interrupt and get the result u need to do following steps. first define union REGS inregs,outregs pass the subroutine value through the inregs
invoke an interrupt with the int86 command and get the result in out regs
this is the procedure to run any interrupt subroutine.