| 摘要 |
A user programmable calculator includes a keyboard, output display means and logic circuitry which generates to the output display means a prompting message indication of the type of data or function entry which the system's operative program, which may be a user stored program, next expects. The keyboard includes a special set of response keys in addition to the numerical and function keys normally incorporated on calculator systems. The special keys facilitate responding to data functional information requests by the calculator. The calculator may be programmed by the user to perform a series of functions upon data entries by entering a series of program steps from the keyboard or from a storage media such as magnetic card, paper tape or the like. The program steps which contain the prompting messages are stored in registers of the calculator system. Upon execution of the stored user program, each time data, functional or responsive information is required a coded representation of the particular entry required to proceed is generated by the logic circuitry and displayed to the user by the display means. The required data may then be entered from the keyboard and the program will continue until entry of further data is required from the user, thereby allowing the user to input in proper sequence a long series of inputs to execute a previously programmed operation on a desired set of data without referring to the program itself.
|
