1. An emulator and digital signal analyzer for automatic functional and parametric testing of a unit under test, within a simulation of that unit's normal functional data environment, comprising: a plurality of digital signal processors, each said digital signal processor responding to said digital signal processor's own series of stored program steps simultaneously with at least one other of the digital signal processors responding to said other digital signal processor's own series of stored program steps for cooperating in the generation of a sequence of digital representations of the operating environment of the unit and for analysis of data signals from the unit under test, for comparison with what should normally be received from the unit under test; means for translating the outputs of the digital signal processors into a representation of a normal data signal environment of the unit under test; shared resources available to all of the digital signal processors; common means for each digital signal processor to communicate with the shared resources and with every other digital signal processor in the emulator; and means for arbitrating between the digital signal processors whenever at least two of them are trying to utilize the common means in order to access or receive from the shared resources, to withhold access from one digital signal processor and permit access to another digital signal processor.