The entropy sources used by the BS2000 PRNGD include:
access times to specific, frequently used files
outputs of commands relating to data that changes dynamically, such as SHOW-USER-STATUS with various parameters, or outputs of the SHOW-DAB-CACHING command if DAB is used on the system in automatic operation
You can define the files and commands to be used in a configuration file. To do this you specify for the commands what relative entropy content a particular output has so as to place more emphasis on commands with little explanatory (in other words unchanging) text and outputs that vary greatly. This permits adaptations to local conditions. In contrast, access times to files play no part in entropy accounting.
You can also specify the intervals at which the time stamps for the files are to be queried and the commands are to be executed. Outside the initialization phase, only one of the files is queried and one of the commands executed.
One further important entropy source is network traffic. Here the BS2000 PRNGD accesses the network traffic data collected by BCAM (number of bytes and packets etc. sent and received on a connection). However, configuration for this is neither necessary nor possible.