Devices

Devices

UOS hardware devices consist of three items:

1. Type
2. Controller
3. Unit

Type indicates the type of device.  Controller is a number between 0 and 25, indicating which hardware controller, of the type. Unit is the device index on that controller.

The HAL keeps a list of devices, and can be queried for information about these devices by using an index (index 0 is the first device).  The TDevice_Info structure is how this information is communicated back from the HAL.

The TDevice_Info structure is used to return information about a given device:

type TDevice_Info = packed record

                       Device_Type : word ;

                       Controller : word ;

                       Device_Unit : word ;

                       Disabled : boolean ;

                       Media_Present : boolean ;

                   end ;

The items in this structure are described in this table:

Device types have the following values: