INT 13 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./MS INT 13 Extensions - INSTALLATION CHECK AH = 41h BX = 55AAh DL = drive (80h-FFh) Return: CF set on error (extensions not supported) AH = 01h (invalid function) CF clear if successful BX = AA55h if installed AH = major version of extensions 01h = 1.x 20h = 2.0 / EDD-1.0 21h = 2.1 / EDD-1.1 30h = EDD-3.0 AL = internal use CX = API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. subset support bitmap (see #00271) DH = extension version (v2.0+ ??? -- not present in 1.x) Note: the Phoenix Enhanced Disk Drive Specification v1.0 uses version 2.0 of the INT 13 Extensions API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. SeeAlso: AH=42h"INT 13 Ext",AH=48h"INT 13 Ext" Bitfields for IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./MS INT 13 Extensions API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running. Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. support bitmap: Bit(s) Description (Table 00271) 0 extended disk access functions (AH=42h-44h,47h,48h) supported 1 removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h) supported 2 enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported extended drive parameter table is valid (see #00273,#00278) 3-15 reserved (0)