INT 13 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./MS INT 13 Extensions - EXTENDED WRITE AH = 43h AL = write flags ---v1.0,2.0--- bit 0: verify write bits 7-1 reserved (0) ---v2.1+ --- 00h,01h write without verify 02h write with verify DL = drive number DS:SI -> disk address packet (see #00272) Return: CF clear if successful AH = 00h CF set on error AH = error code (see #00234) disk address packet's block count field set to number of blocks successfully transferred Note: the BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. returns CF set/AH=01h (invalid function) if verify is requested but not supported SeeAlso: AH=03h,AH=41h"INT 13 Ext",AH=42h"INT 13 Ext",AH=44h