Abstract
This paper describes the operation and design features of the data-scanner distributor for the No. 1 ESS ADF. The objective was to design a unit which could handle handshaking, addressing, and message transmission for a large number of duplex data lines at a low cost and with the ability to accommodate all speeds and codes now commonly used in low-speed data machines. The storage medium chosen employs ultrasonic delay lines in a highly time-shared mode. This permitted a compact design which provides input/output capabilities to serve 512 fully duplex data lines. By using a high-speed scan, each character bit of each line is sampled many times. Thus, highly distorted input data can be successfully processed, and output data is essentially distortion free.
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