Browse Prior Art Database

Teletype Input System

IP.com Disclosure Number: IPCOM000096284D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 77K

Publishing Venue

IBM

Related People

Cotton, RM: AUTHOR

Abstract

The apparatus is used at a station to which a plurality of TTY channels, such as 1 and 2, are incoming. In addition to being coupled to equipment at the presently considered station, the channels also are coupled to remote stations. These are substantially identical in function. At the station under consideration substantially identical terminations, such as 3 and 4 as well as other equipment, such as word formation registers A and 9, are provided for the various channels. The apparatus minimizes the total equipment content at the station, This is by providing equipment, common to the various channels, to evaluate TTY characters incoming over the channels and to direct the use or disposition of such characters.

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Teletype Input System

The apparatus is used at a station to which a plurality of TTY channels, such as 1 and 2, are incoming. In addition to being coupled to equipment at the presently considered station, the channels also are coupled to remote stations. These are substantially identical in function. At the station under consideration substantially identical terminations, such as 3 and 4 as well as other equipment, such as word formation registers A and 9, are provided for the various channels. The apparatus minimizes the total equipment content at the station, This is by providing equipment, common to the various channels, to evaluate TTY characters incoming over the channels and to direct the use or disposition of such characters.

In the case of channel 1, each termination includes convertor 5 for detecting and transforming channel signals into serially occurring binary bits as well as shift register 6 which includes nine stages A,.. I, Both convertor 5 and register 6, as well as common control 11, are operated by signals furnished by common timing generator 7. This provides control signals to the equipment individual to the various channels in sequence at a rate sufficient to service all channels without loss of channel signals.

Within termination 3, bits from convertor 5 are inserted in the fifth state E of register 6. They are shifted stage-by-stage toward stage 1, so that the five bits of each TTY character received from channel 1 become stored in stages E...I. Stages A... D are reserved for storing the four bits of a status word. These are assigned arbitrary identifying numbers 0....9 and are generated and used as later described. Both status word numbers and the binary coded representations of these status numbers, taken from stages A... D, are shown in the status drawing. The bits of each set of four data characters, as opposed to supervisory or control characters, derived from channel 1 and successively stored in register 6, are to be assembled in shift type, word formation register 8.

The start of each TTY message incoming over channel 1 is signalled by the occurrence of a combination of characters FIGS, H, LTRS reserved for such use. The start-of-message characters are followed by two address char...