Abstract: A compact circuit for selectively controlling the operation of a plurality of metal oxide semiconductor field effect transistors (MOSFETs) which drive a readout display, such as that found in a hand-held calculator, or the like. The circuit includes an internal power supply to develop a driving voltage (V.sub.gg), the magnitude of which is substantially boosted with respect to that of the calculator operating voltage (V.sub.DD). The circuit also includes an improved strobe driver connected between the display and the power supply to selectively apply the boosted driving voltage to a control electrode of any one of the plurality of MOSFETs.

Abstract: A buffered serial to parallel memory system uses an output driver which is semi-independently operated by separate control logic. Following conventional serial data input to a first buffer, the separate control logic responds to a predetermined signal to independently clear a second buffer, transfer the data from the first buffer to the second buffer and then clear the first buffer for further data input. The stored data in the second buffer is then used for output devices requiring parallel data output.

Abstract: An integrated circuit calculator which can operate in either a twelve digit or an eight digit mode is provided. A conditional modification circuit modifies some of the memory addresses employed in the twelve digit calculator to provide the eight digit calculator with more random access memory registers than the 12 digit calculator. In the twelve digit calculator, the conditional modification circuit also controls folding of some memory registers in order to minimize the chip area required for the memory circuitry and control logic.

Abstract: A time delay circuit comprising an improved charge transfer scheme for use in a microelectronic circuit, such as, but not limited to, a calculator, and the like. The circuit efficiently charges a capacitance means with a signal to subsequently energize a utilization means. Sufficient time delay is provided when charging the capacitance means, after power is applied to the microelectronic chip means and before the utilization means is suitably energized, to insure that associated logic is first initialized and sources of reference potential are at proper operating levels.

Abstract: Circuitry having a unique strobing scheme to effectively drive both a light-emitting diode display and an associated keyboard directly from a single semiconductor chip. The circuitry accurately senses which of the keyboard keys is in a depressed condition in order that a suitable representation thereof may be displayed at an appropriate time.