A device for use with a digital computer for storing standard software used by the computer and modifying the address portions of the standard software prior to transmission to the computer. The device includes a ROM package containing a ROM within which is stored a standard software subprogram written assuming it is stored at an absolute location in the computer's memory other than its actual location in the computer's memory system. Also included in the ROM package is a base register which can...

A data transmission system which includes stations connected in a closed loop configuration with interface capabilities at each station to connect to an external data processor. Through this configuration simultaneous transmission of data among processors connected to stations on the loop can be carried out by transmission of data around the loop between particular stations. Data is transmitted from a first processor to its individual station connected to the loop. This first station formats the...

A device is provided for printing a verbal composition in a text form transposed by an operator from the language form in which the source material is presented. Language character forms from different written language formats are encoded and maintained in electronic storage. An operator of the device selects a particular language character from a desired language character font in a single or multiple step selection process to appear at sequential locations of the text during composition of the...

An adapter for use with a host processor for processing interrupts between a host processor and a plurality of remote data terminal devices is disclosed. The adapter includes a microprocessor, counter means which is incremented by a clock for sequentially interrogating a plurality of remote data terminal devices to determine whether or not a remote device is requesting access to the host processor and an external buffer for storing the output of the counter. The output of the counter is transfer...

A data processing unit in which the clock speed is selected to match the access times of the store units connected to it. This is achieved by means of a special terminal on each store unit, this terminal being internally grounded if the unit is of a slow access type, and open-circuited if the unit is of a fast access type.

A symptom compression device receives binary coded information including bits signifying symptoms present in the course of each operating cycle at selected points in an integrated logical network, microprocessor or the like. The device includes a first register, a second shift register, an EXCLUSIVE OR logic network, and a display. The binary coded information is received on parallel inputs of the first register and applied from parallel outputs of the first register to a set of inputs of the EX...

A microprocessor based program loader is connected to the memory data bus and memory address bus of a programmable controller. The program loader is responsive to commands entered through a keyboard to load and edit the programmable controller control program. A mode switch associated with the programmable controller provides a number of selectable positions which determine the mode of operation of the programmable controller and the functions that can be performed by the program loader. One of ...

In a microprocessor based system, wherein at least one microprocessor is battery powered, a power strobe circuit includes an analog switch for connecting the battery to the microprocessor only during programmed task performance. Upon completion of task performance, the microprocessor generates signals which trigger the analog switch to open, thereby deenergizing the microprocessor and to enable an external timer. After a predetermined period of time, which may be fixed in the timer or programmed...

Two asynchronously operating computers which are each controlled by timing periods produced by its own clock are each provided with a pulse treatment circuit which in response to a break signal, interrupts the computer operation during the following timing period. A buffer memory is used in order to transfer information from the first to the second of the computers. Because of the asynchronism there is a risk that the buffer memory becomes either totally occupied or unoccupied. The risk is elimi...

Improved means and methods for providing highly flexible microinstruction sequencing in a microprogrammed digital data processing system particularly with regard to the handling of specialized types of sequencing situations such as are involved in wait-loop and repeat situations. The microprogramming control system is implemented using a plurality of programmable read only memories storing control words chosen so as to provide for microinstruction sequencing in a manner which in the first instan...