Name | Value |
---|---|
NAME | XUDOC DEVICE FILE* |
HEADER | DEVICE FILE STRUCTURE |
TEXT | All connected Volume Sets (CPUs) make use of a single, replicable, Device Each CPU has several ports to which devices may be connected. The port number is the $I value. Most physical devices are thus connected to one CPU via one $I. When using the device, however, different specifications may be used for output. It is the device name which distinguishes the specifications such as open and close execute or use parameters. Each entry in the Device File, then, uniquely identifies a set of instructions to send to a $I location on a particular CPU. File. All information concerning a particular device is stored in just one place which facilitates device management. One way to demonstrate the structure of the Device File is to experiment with [DEVICE LOOKUP] by using an option like Device Edit. Notice the fields 'Name', 'Device $I', and 'Volume Set(CPU)'. Together, these three attributes characterize an entry in the Device File. |
RELATED FRAME |
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DATE ENTERED | 1989-01-20 00:00:00 |
AUTHOR | USER,ONE |