A data processing system includes a plurality of system units all connected in common to a system bus. Included are a main memory system and a high speed buffer or cache store. System units communicate with each other over the system bus. Apparatus in the cache store monitors each communication between system units to determine if it is a communication from a system unit to main memory which will update a word location in main memory. If that word location is also stored in cache then the word l...

In a storage system including a semi-permanent database there is provided apparatus for updating said database comprising: instrumentalities for reading magnetically recorded data and storing said data in said database; a rotatable drum having an exterior circumferentially-extending surface, said drum including a plurality of protrusions extending beyond said exterior surface; a flexible magnetic card including database updating data magnetically recorded on a major surface thereof, said card ha...

An AC display excitation and synchronous display updating circuit for a digital electronic instrument in which the counter accumulating clock pulses representative of the magnitude of the quantity to be represented on the digital display is used as a frequency divider to obtain an AC display energizing signal whose frequency is reduced from the clock frequency to a suitable level for energizing the display. The contents of the continuously driven counter are synchronously transferred to the disp...

Apparatus and method for updating microform information recorded in a sequence on photographic film emulsion, including taking a desired portion of the emulsion carrying an image and bonding it to a primary base material either in the same sequence but with gaps left in the sequence or in a different sequence. The emulsion is bonded into sunken areas in the base material, the sunken areas either being formed by indented portions in the base material or by applying an apertured frame surrounding ...

A data storage record such as an Itek RS microfiche is updated by delineating an area to be processed, dark-adapting at least this area and exposing to input data, and processing in the delineated area. In one embodiment, desensitization or dark adaptation is accomplished by treatment with hydrogen peroxide, followed by resensitization by the application of a reactive material such as a silver salt.

A data communications system for asynchronous communication having at least two data transmit/receive terminals wherein the display is periodically updated with new send or receive data. In the receive mode the data is accumulated in a receive buffer for a predetermined time interval and then transferred into a text storage buffer which then activates a display access method to process the stored data and update the display. The display access method then goes into an "idle" mode and waits for t...

A sync separator detects the occurrence of a corresponding sync pulse in a corresponding part of the waveform of a composite video signal. The level of the sync tip is used for updating a slice level signal, provided the level of the sync tip is lower than that of the preceding sync tip signal. A time-out signal is generated at the end of a time-out interval that has elapsed from the last time the sync tip signal was updated, provided the sync tip signal was not updated within such time-out inte...

Updating firmware stored in a rewritable non-volatile memory as a plurality of firmware code images having position dependent code. A plurality of update code images are made available that have position dependent code specifying positions of a rewritable non-volatile memory, such that each update code image is suitable for replacing a different stored code image. A computer processor determines which stored code image is to be updated; and selects the one of the plurality of update code images ...

A pattern-matching system, such as of the RETE type, is updated. The updating operation is generalize to operate with correct match resuslts for generalized RETE networks (ones where join nodes may have either predecessor be another join node), and for arbitrary partial update state, characterized by stop nodes designating how far update operations have progressed for particular update tokens (designated suspended tokens) at any particular time. The updating operation consists of the following s...

A computer system is disclosed in which individual executing process can be replaced with updated or corrected versions of themselves without interrupting or otherwise interfering with the operation of the computer system. In particular, embedded in the process itself is a command or function or subroutine call which operates to overlay the process code in memory with an updated version of itself, without losing or altering the relationships of the process to the other processes in the computer....