Abstract: A novel polyethynylacetylene derivative represented by the formula ##STR1## wherein R is H, (C1-7) alkyl, phenyl, benzyl, naphthyl, carbazole, (C2-7) vinyl-alkyl --CX.sub.1 X.sub.2 (OH) or --SiX.sub.1 X.sub.2 X.sub.3 in which X.sub.1, X.sub.2 and X.sub.3 are H, (C1-7) alkyl, phenyl or benzyl, with the proviso that the case where all of X.sub.1, X.sub.2 and X.sub.3 are H is excluded and x is a number of 20 to 500. The polyethynylacetylene derivative is prepared by polymerizing a monomer of the formula HC.tbd.C--C.tbd.CR wherein R is as defined above, with the proviso that the case where R is H is excluded, in the presence of a metathesis catalyst or a Ziegler catalyst. A polyethynylacetylene derivative of the above formula (wherein R=H) is prepared by reacting a polyethynylacetylene derivative of the above formula wherein R=Si(C.sub.n H.sub.2n+1).sub.3 with a desilylating agent. The polyethynylacetylene derivative is soluble in organic solvents and can be shaped into various articles.

Abstract: For allowing a port to serve as not only one of the system clock input port but also a data input/output port, there is disclosed a data processing unit comprising a system clock supplying circuit operative in an internal oscillation mode or a transmission mode depending upon a mode selecting signal, a shifting circuit operative to provide an electrical path between two ports and the system clock supplying circuit in the internal oscillation mode but to provide another electrical path between one of the two ports and a data input/output line in the transmission mode, so that one of the ports serves between the clock input port and the data input/output port depending upon the mode selecting signal.

Abstract: A highly electroconductive carbonaceous film having an electrical conductivity of at least about 1000 s/cm is prepared by thermally decomposing a diethynylbenzene in a carrier gas composed of an inert gas at a temperature of about 950.degree. C. to about 1050.degree. C.

Abstract: Polyvinylene sulfide is prepared in a high yield by reacting 1,2-dichloroethylene with sodium sulfide in the presence of dimethyl sulfoxide.