Dynamic Priority Manager Under Application Program Control
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
To control the data stream between a control unit and its adapters on a common bus, priority has to be given to the requestor adapter with the highest priority. The priority level of any adapter can be changed at any time. This priority level is under control of the application program so that no manual intervention is required to change the priority. The dynamic priority manager is used to control the data stream between a host system and high speed scanners (HLS). The interface between the host system and the scanners is performed by a parallel data adapter to byte bus converter (PDA/BBC) interface which controls the HLS priority. When an HLS requests to interface PDA/BBC a transfer to the host system, this request is serviced immediately if interface PDA/BBC is available.