Data acquisition and on-line analysis of experiments on isolated cardiac muscle with a PDP-12/PDP-11 system
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A data-acquisition system has been constructed which collects, reduces, and stores data obtained by digitalisation of contraction curves and transmembrane action potentials. The system consists of an interface directly connected to the experiment, a digital multiplexer, and an interface to a PDP-12/PDP-11 computer system. A maximum of six laboratories with three analogue or 12-bit digital channels each, can be handled simultaneously by the system. The PDP-12, which only serves as a buffer, collects the data from the different laboratories and transmits them to the PDP-11. The data acquisition is controlled by a handler, which runs in the foreground of the PDP-11-foreground/background monitor. By means of a code which heads each data block and which can be chosen by the user, the PDP-11 selects the kind of evaluation, reduces, and stores the data. Because of its flexibility the system can easily be used for other physiological measurements.
KeywordsData acquisition On-line analysis Isolated heart muscle contraction
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