Abstract: A dual serial port data acquisition interface assembly including a printed circuit board for supporting additional components of the dual serial port assembly, a personal computer peripheral component interconnect connector secured to the printed circuit board for passing data between the printed circuit board and a personal computer. A first serial port connector mounted on the printed circuit transferring communication data and synchronization data between the personal computer and the data storage device through a programmed universal asynchronous receiver/transmitter microchip, and a second serial port connector mounted on the printed circuit board passing a performance data of the servo control circuit from the data storage device through a serial-to-parallel converter to the personal computer.

Abstract: A dual serial port data acquisition interface assembly including a printed circuit board for supporting additional components of the dual serial port assembly, a personal computer peripheral component interconnect connector secured to the printed circuit board for passing data between the printed circuit board and a personal computer. A first serial port connector mounted on the printed circuit transferring communication data and synchronization data between the personal computer and the data storage device through a programmed universal asynchronous receiver/transmitter microchip, and a second serial port connector mounted on the printed circuit board passing a performance data of the servo control circuit from the data storage device through a serial-to-parallel converter to the personal computer.

Abstract: An apparatus and method for minimizing the effects of rotational vibration upon a disc drive having a base deck supporting a rotatable disc and an actuator having a moveable data head. A fixed head is supported over the disc at a predetermined radius and transduces a circumferentially extending frequency pattern written to the disc at a constant frequency to generate a readback signal. A frequency modulation (FM) demodulator generates a rotational velocity signal indicative of application of rotational vibration to the base deck in relation to changes in frequency of the readback signal. A servo circuit controllably positions the moveable data head in response to the rotational velocity signal and servo information readback by the moveable data head. The servo circuit interrupts a data transfer operation between the moveable data head and a host device when a magnitude of the rotational velocity signal exceeds a predetermined threshold.

Abstract: A photographic element contains a light-sensitive silver halide layer having associated therewith a coupler which is a pyrazolone compound with a coupling-off substituent at the -4-position, said compound having the formula: ##STR1## wherein each R.sup.1 is independently a substituted or unsubstituted alkylsulfonyl or arylsulfonyl group; each R.sup.2 and R.sup.3 is independently a substituent; R.sup.4, R.sup.5, and R.sup.6 are independently hydrogen or substituted or unsubstituted alkyl groups; m and n are independently 0 or 1 but both are not 0; x1 and x2 are independently 0 to 5; and y is 0 to 3; provided that each of R.sup.3, R.sup.4, R.sup.5, and R.sup.6 is selected such that the calculated log P of the thiophenol corresponding to the substituent at the 4-position of the pyrazolone is at least 4. The photographic element provides an improved combination of low continued coupling together with a magenta hue exhibiting a long wavelength of maximum absorption.