Download Amiga Programmers Handbook Volum II volume 2nd by EUGENE P. MORTIMORE PDF

By EUGENE P. MORTIMORE

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The Unit Structure The V nit structure is defined as follows: struct Unit { struct MsgPort * uniCMsgPort; UBYTE unit_Flags; UBYTE unit_Pad; UWORD unit_OpenCnt; }; These are the parameters in the V nit structure: • unit_MsgPort. This parameter is a pointer to a MsgPort structure that is used to queue all I/O requests coming from all tasks into this device unit. The message port will be shared by more than one task if those tasks open the unit in shared access mode. • unit_Flags. This parameter contains a set of flag parameters for the device unit.

The Audio, Parallel, Serial, Timer, and TrackDisk devices have one additional structure each. The Clipboard device has two, the Keyboard device has three, and the Printer device has four additional structures. Nine devices have one INCLUDE file each that defines their structures and other data required for a task to interface with the device internal routines. However, the Console, Input, Keyboard, and Printer devices have two INCLUDE files each. 2, you will know the names of all device-related structures and where to find structure definitions and other data needed to deal with each Amiga device.

The Audio and Timer devices both use the IORequest structure as a substructure in their I/O request structures to send commands and data to their respective device routines. On the other hand, the Clipboard, Narrator, Parallel, Serial, Printer, and TrackDisk devices use the IOStdReq structure. In addition to the I/O request structure, most devices use other structures to help manage the device. The Audio, Parallel, Serial, Timer, and TrackDisk devices have one additional structure each. The Clipboard device has two, the Keyboard device has three, and the Printer device has four additional structures.

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