Abstract: A keyboard operated programmable electronic calculator is provided with a light display and individual key lights for the numeric and function keys. A program is entered into storage by operation of the numeric and function keys when the calculator is activated to the program mode by a first control key. The program is read out of storage by operation of a second control key. Control logic under control of the calculator CPU operates the light display and the individual key lights in response to manual operation of the second control key to identify the program step and its program parameter for checking purposes.

Abstract: We describe a multi-mode event recorder for registering behavioral events directly on a punched paper tape. The paper tape produced can be read by any computer equipped with a paper tape reader. For paper tape with an 8-bit code, 256 different events can be registered. The device itself can be operated in any one of four modes. In the first mode, pressing a key on the keyboard results in a unique code (hole combination) being punched on the paper tape. In the second mode of operation, a sequentially increasing number ("time") is punched automatically at preset intervals. In addition, other codes may be entered via the keyboard. A time punch may thus be used to signal that an observation should be entered from the keyboard. In the third mode, the machine punches, at regular intervals, the code of the key currently depressed. In mode 4, external events are counted for a given time interval and the sum punched onto the tape at the end of the interval. With each punch, the sum is reset to zero. The paper tapes produced are read directly and the data processed according to the program. This results in a great reduction in the time necessary to process data. The system is compared with other devices which use magnetic tape as an intermediate storage device. The main advantage of this system is the time saved in processing data.

Abstract: A new version of the REDUCE program for algebraic manipulation which performs a complete mode analysis of each command as a separate extension of the parse is presented. As a result, programs become more efficient and are easier to write and debug because the semantic error checking is more complete.

Abstract: A half-tone storage tube is disclosed which, after a storage target has been electrically prepared, has information written on such storage target in a writing mode, said storage target is subjected to a small amplitude alternating voltage means while in a reading mode, thereby minimizing the effects of differential cutoff so that the image produced on the storage tube screen can easily be viewed, thereby permitting information written at higher writing rates to be viewable.

Abstract: The development of LSI microprocessors in terminal controllers enables tasks decentralization and increases the terminal performances for a lower cost. This paper describes a small alphanumeric display giving the user the opportunity of programming in a high level language, in a conversational mode. The microprocessor manages: the control of the keyboard, the display of the current sentence, the exchanges with the main computer. It also controls a syntactic filtering of the user's sentence. The keyboard is composed of alphanumeric and function keys. The alphanumeric text is not processed, while function keys are considered as delimiters. Each keyword of the language is assigned a keyboard position. The microprocessor has a grammar defining the syntactic rules; the processor generates a coded string corresponding to the sentence. This will be transmitted only if the sentence is correct. The user can modify at any instant the elements of his sentence. The terminal performances can be extended to several languages. To change the language, one has only to replace the grammar and the corresponding microprograms. These ones, such as the grammar, can either be resident or they are sent by the main computer, according to the requirements.