Browse Prior Art Database

Communications Adapter

IP.com Disclosure Number: IPCOM000072895D
Original Publication Date: 1970-Oct-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 3 page(s) / 47K

Publishing Venue

IBM

Related People

Lathwell, RH: AUTHOR [+2]

Abstract

The console keyboard of the IBM 1130 Computing System provides a character set which is not adapted for some programming languages such as APL. The described adapter makes it possible to use an IBM 2741 Communications Terminal capable of a switched connection from an unlimited distance.

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Communications Adapter

The console keyboard of the IBM 1130 Computing System provides a character set which is not adapted for some programming languages such as APL. The described adapter makes it possible to use an IBM 2741 Communications Terminal capable of a switched connection from an unlimited distance.

The adapter whose operation is illustrated in the figure requires no modification of either the 1130 or of the 2741. The 1130 Paper Tape channels are the most convenient existing 1130 interface to which a slow speed adapter can be connected. There are two independent channels: the Paper Tape Reader (input to the 1130) and the Paper Tape Punch (output from the 1130). Data are transferred to and from the 1131 CPU eight bits in parallel, so that serializing and deserializing circuitry is required.

The 2741 SLT board provides the basic electronics for the adapter since it contains most of the functions required for serialization, deserialization, control character recognition, and control function.

Familiarity with the operation of the IBM 2741 Communications Terminal and of the IBM 1130 Computing System as described in the following publications is assumed:

IBM 2740/2741 Communications Terminal, Theory of Operation, form Y27- 0013.

IBM 2740/2741 Communications Terminal, Field Engineering Diagram Manual, form Y27-0014.

IBM 2741 Communications Terminal, Maintenance Diagram Manual, part number 1176167.

IBM 1131 Central Processing Unit, Original Equipment Manufacturers Information, form A26-3645.

In the following circuits, the operation of the adapter differs from the operation of the 2741: Line Control 1, Strobe and 10C Integrators, 2B Register Control, EOT, Mode change and 1B and 2B Reset....