Browse Prior Art Database

Terminal Numeric Pad Feature

IP.com Disclosure Number: IPCOM000084304D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Vesper, AR: AUTHOR

Abstract

Fig. 1 is typical of many conventional terminals in which the keyboards are arranged in the form of conventional typewriters. A decode network 1 is activated by the mechanical key inputs to provide a coded output that is placed in the P register 2. The output of this register is then fed to printer and communication circuits.

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Terminal Numeric Pad Feature

Fig. 1 is typical of many conventional terminals in which the keyboards are arranged in the form of conventional typewriters. A decode network 1 is activated by the mechanical key inputs to provide a coded output that is placed in the P register 2. The output of this register is then fed to printer and communication circuits.

The advantages of using a numeric pad feature for entering numbers is recognized, and one way to incorporate such a feature into a conventional type of terminal is shown in Fig. 2. Here, a read-only memory 3 is connected to the output of decoder 1 and provides an output that is fed to register 2 similar to the above-described system. The terminal has an extra key or switch which, when activated, provides a numeric pad select signal 4 that is fed to memory 3. When the key is unactivated, the terminal acts as the conventional one in Fig. 1 wherein all key codes are left unchanged. When the numeric pad select feature is activated, a translation table in memory 3 converts codes from the keys in the numeric pad to codes for the appropriate numeric characters and leaves all other codes unchanged.

The advantages of such a system are that the use of the numeric pad is under user control, numeric data entry is easier to accomplish, no special type element is required and the change is transparent to a computer and requires no reprogramming.

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