Abstract: A PLC (programmable logic controller) processor which carries out logical operations. The processor comprises a logical operation unit (2) for executing a logical operation, a jump inhibition unit (3), a jump condition checking unit (4) for checking whether or not a jump can be carried out while omitting executions of subsequent instructions, and a jump instruction execution unit (5) for executing the jump instruction. When the result of the checking by the jump condition checking means (4) indicates that subsequent instructions need not be executed and the jump should be carried out, the jump instruction execution means executes the jump, whereby unnecessary instructions are not executed, thus the speed of the logical processing is increased.

Abstract: A mounting mechanism for a ribbon cassette for mounting the ribbon cassette on a carrier of a printer having a pair of resiliently deformable arms which are formed in such a manner as to extend forwardly along the opposite side walls from a rear end of the ribbon cassette, and a pin is formed in an integrated relationship on each of the arms. A pair of holes for receiving the pins are formed on the carrier side of the printer, and the ribbon cassette is mounted onto the carrier by resiliently deforming the arms to fit the pins into the holes of the carrier.

Abstract: A nematic liquid crystal composition, including p-methoxybenzylidene-p'-n-butylaniline, p-butoxybenzylidene-p'-n-butylaniline and bis(p'-n-octyloxy benzylidene)-chloro-p-phenylenediamine, has desirable thermodynamic properties, including a nematic mesophase over a wide temperature range, and also has a high dynamic scattering contrast ratio.