[en] The results of three EXOSAT observations of XO142+614 made in 1984 August, 1985 November and December are reported. A 25-min coherent modulation was detected during the first observation, but not during the following two. The modulation peak-to-peak amplitude was 55 per cent between 3 and 8 keV and < 1 per cent between 1 and 3 keV. The 1-10 keV spectrum was fit with a power law of energy index approx. 3 in all three observations, except during the observation when X-ray pulsations were detected when a second power-law component with an energy index of approx. 1 and a high and a high absorption column density was also required. The data are consistent with the modulation being confined to the flatter spectral component. New position measurements from both EXOSAT and the Einstein HRI are presented. (author)