Abstract: A test signal generator outputs a test signal synchronized with the data transmission of the CPU. The test signal is supplied concurrently to a comparator and to an input unit. The output signal of the input unit is then supplied to a line of an bus signal to be stored in a first storage unit. On the line of the bus signal, there is provided an LPF consisting of an resistance and an capacity. When transmission of the bus signal is delayed, the output signal of the comparator changes according to the timing of a clock. The changed output signal is immediately stored in a second storage unit to output a reset signal, thereby resetting the CPU.

Abstract: A naphthothiopyranone derivative represented by the formula: ##STR1## (wherein R.sup.1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms) and an acid addition salt thereof have more excellent antagonist effect at serotonin 3 receptors than the prior art compounds and the effects based thereon, e.g. anti-vomiting effect, gastrointestinal movement regulating effect and anti-anxiety effect.

Abstract: Chalcone derivatives represented by the formula ##STR1## wherein R.sup.1 is a straight chain, branched chain or cyclic alkyl group having 4 to 15 carbon atoms or an alkenyl group having 3 to 15 carbon atoms, and occurs at the 2- or 4-position, R.sup.2 is a hydrogen atom, a straight or branched chain alkyl group having 1 to 3 carbon atoms, and X is a straight or branched chain alkylene group having 1 to 3 carbon atoms, are disclosed. These compounds have anti-ulcer effect, gastric mucosal protection effect and antisecretory effect.