Browse Prior Art Database

Polarized Mode Selector

IP.com Disclosure Number: IPCOM000092350D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Davis, M: AUTHOR [+2]

Abstract

This keyboard overlay has a polarized mode selector. The overlay can be used with an elastic diaphragm switch keyboard. The latter consists of a resilient membrane which is slightly depressed at selected points to effect different switch closures and provide representative electrical signals. The keyboard is used to provide input signals to a computer. A keyboard of this type is described in U. S. patent 3,308,253.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 79% of the total text.

Page 1 of 2

Polarized Mode Selector

This keyboard overlay has a polarized mode selector. The overlay can be used with an elastic diaphragm switch keyboard. The latter consists of a resilient membrane which is slightly depressed at selected points to effect different switch closures and provide representative electrical signals. The keyboard is used to provide input signals to a computer. A keyboard of this type is described in U. S. patent 3,308,253.

Keyboard 6 is provided with overlay card 8 having indicia related to the key designations. For example, if keyboard 6 is being used to enter a particular type of information into the computer, card 8 contains indicia or notations associated with the particular information. If keyboard 6 is being used to introduce other type information, the card 8 having the proper associated indicia is used.

It is necessary that the computer be instructed as to which overlay card is being used at any given time in order to define the system's mode of operation. To accomplish this, multiposition rotary switch 10 is provided. Each position of switch 10 is associated with a different overlay card.

To insure that switch 10 is in the correct position for each card, the cards contain an aperture 12 orientated in the proper switch position for each given card. If switch 10 is in the correct position, the switch knob fits through aperture 12 and the card lies flat. If the switch knob is not in the correct position for the associated card, the knob and...