Abstract: An at least monoaxially stretched polypropylene film made of a composition comprising a crystalline polypropylene and a monocyclic olefin polymer (e.g. a polycyclobutene or a polycyclopentene), wherein the content of the monocyclic olefin polymer is 0.1-1,000 ppm by weight.The polypropylene film is superior not only in transparency but also in image clarity by which an image is clearly seen through the film.The polypropylene film, when further comprising talc having an average particle diameter of 0.1-10 .mu.m in an amount of 50-4,000 ppm by weight, can prevent the surface roughening or edge roughening of sheet during the sheet formation conducted before stretched film production.The polypropylene film, when further comprising an anti-blocking agent and a polyethylene together, can prevent the generation of voids caused by the anti-blocking agent.

Abstract: A data processing system including a data transfer abnormality processing unit in which delays caused by the production of a data transfer abnormality signal during a data transfer cycle period are eliminated. A bus controller, a memory unit and one more data processing units are connected in parallel to a common bus which includes a data transfer abnormality signal line. The bus controller includes a data register which receives data from the common bus, delaying it for one cycle period before applying it to a transfer abnormality check circuit. The transfer abnormality signal produced by the transfer abnormality check circuit is stored in a transfer abnormality setting flip-flop in each data processing circuit with a clock pulse which is produced delayed with respect to a bus use permission signal.