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Excerpt from Servol: Preliminary Proposal for a Programming Language for Real-Time Servo Control Parameter variables enable communication with the host computer. Every such variable is either 'read only' or 'write only'. Read only parameter variables, declared with the attribute read, are quantities the host computer transmits to servol. Examples are: the position target for a moving robot arm, position limits, thresholds at which interrupts are to be generated, etc. Write only parameter variables, declared with the attribute write, are quantities which servol updates continuously and makes available to the host computer, which can poll them when required, use them to update graphic displays, etc. Internal variables are named intermediate quantities local to servol, and are used to facilitate the computation of control write and parameter write outputs from control read and parameter read inputs. Internal variables can be initialized to constant values. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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