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Not to be confused with Mode 13h.
INT 13h is shorthand for BIOS interrupt call 13hex, the 20th interrupt vector in an x86-based (IBM PC-descended) computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides sector-based hard disk and floppy disk read and write services using cylinder-head-sector (CHS) addressing. Modern PC BIOSes also include INT 13h extension functions, originated by IBM and Microsoft in 1992, that provide those same disk access services using 64-bit LBA addressing; with minor additions, these were quasi-standardized by Phoenix Technologies and others as the EDD (Enhanced Disk Drive) BIOS extensions.
INT is an x86 instruction that triggers a software interrupt, and 13hex is the interrupt number (as a hexadecimal value) being called.
Modern computers come with both BIOS INT 13h and UEFI functionality that provides the same services and more, with the exception of UEFI Class 3 that completely removes CSM thus lacks INT 13h and other interrupts. Typically, UEFI drivers use LBA-addressing instead of CHS-addressing.
INT13h is shorthand for BIOS interrupt call 13hex, the 20th interrupt vector in an x86-based (IBM PC-descended) computer system. The BIOS typically sets...
to the drive.: 87 However, the IBM BIOS implementation defined in the INT13h disk access routines used quite a different 24-bit scheme for CHS addressing...
Multiple controllers can hook INT13h at once. For instance, after the SCSI controller, an AHCI controller can also hook INT13h by putting a call to the previous...
INT 10h, INT 10H or INT 16 is shorthand for BIOS interrupt call 10hex, the 17th interrupt vector in an x86-based computer system. The BIOS typically sets...
Mode 13h is the standard 256-color mode on VGA graphics hardware introduced in 1987 with the IBM PS/2. It has a resolution of 320×200 pixels. It was used...
boots unilaterally, it can simply hook INT 19h or other interrupts normally called from interrupt 19h, such as INT13h, the BIOS disk service, to intercept...
within two bytes in order to facilitate making calls to the original/legacy INT13h BIOS disk access routines, where 16 bits were divided into sector and cylinder...
register values: INT 21h/AH=2Ah "Get system date" returned values: CX = year (1980..2099), DH = month (1..12), DL = day (1..31). INT 21h/AH=2Ch "Get system...
will assign a BIOS drive number to the CD drive. The drive number (for INT13H) assigned is any of 80hex (hard disk emulation), 00hex (floppy disk emulation)...
if the BPB value is set to FFh.) DH bit 5 = 0: device supported through INT13h; else: don't care (should be zero). DH is supported by some IBM BIOSes...
more sophisticated. Advanced techniques included hooking low-level disk INT13H BIOS interrupt calls to hide unauthorized modifications to files. The first...
functionality which the operating system depends on (particularly interrupts INT 10H and INT13H). HP Integrity Virtual Machines provides UEFI boot on HP Integrity...
patching low-level BIOS interrupts such as int13h, the low-level disk I/O interrupt. When a program issued an int 21h call to access MS-DOS, the call would...
charging[citation needed]. The device does not provide the BIOS service (INT13h) for reading from a hard disk. Drivers have been partially written for...
calls to the DOS API are invoked using software interrupt 21h (INT 21h). By calling INT 21h with a subfunction number in the AH processor register and...
24 bits always uses 6 bits for up to 63 sectors per track (1...63), and INT13h disk access generally uses 8 bits for up to 256 heads (0...255), leaving...
authorship of "well-behaved" programs that accessed hardware only through BIOS INT calls (and DOS service calls), to support compatibility of software with...
the BIOS had a hard drive capacity limitation of 8.9 GB because of BIOS INT13H. In July 1997, the Santa Cruz Sheriff's office purchased 29 IBM ThinkPad...
Carboxyl-Carbon and α-Nitrogen from Amino Acids in Soil Hydrolysates". J. AOAC Int. 86 (6): 1106–1111. doi:10.1093/jaoac/86.6.1106. PMID 14979690.{{cite journal}}:...
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