Specifications

44 AMD Geode™ GeodeROM Functional Specification
Non-Removable Media
32087C
The format of the caller-supplied parameters and return values adheres to standard industry descriptions of the INT 13h
API for floppy drives, as outlined in innumerable references, such as the “IBM PC/AT Technical Reference Manual,” “PC
Interrupts”, etc. A description of each function is provided next.
6.2 INT 13h Functions Descriptions
This section describes the parameters and return values for each ATA device-specific INT 13h function in GeodeROM. This
section is intended as a guide. Developers interested in extending and/or debugging the GeodeROM INT 13h interface
should consult the documentation listed on the AMD Geode™ Developer Support site.
INT 13h provides the operating system with a series of functions for communicating with the system’s fixed and floppy disk
drives. The INT 13h interface is a cornerstone of PC/AT compatibility because it ensures that software applications, such as
DOS and Microsoft
®
Windows
®
, can read and write disk-based data in a uniform fashion, across a broad variety of archi-
tectures.
6.2.1 Function 00h - Reset Disk Subsystem
Description:
In an ATA drive-equipped system, this function toggles bit four in register six of the Control Register Block. This causes
the disk(s) to recalibrate internally and seek to cylinder.
Supports:
Fixed disks and floppy disks.
Passed:
Parameter Description
AH 00h
DL Drive number