Abstract
Abstract A circuit is described that forms part of a microprocessor-based communications switching system performing similar functions to that described by Wittie 1 . On paper, the designed system has a throughput of 10 000–20 000 character/s per processor, and has the capability of handling large numbers of ports, provided that this throughput is not exceeded. It would seem that this far exceeds anything else so far developed, current figures giving 1 000–2 500 character/s per processor, thus necessitating multiprocessor configurations. While the interrupt handler was originally designed 2 for communications switching, it can be used in other areas, with or without microprocessors, e.g. for handling interrupt type signals from large numbers of sources in alarm systems etc.
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