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PDP-8 TO 103A DATAPHONE AND/OR ONLINE TELETYPE INTERFACE

IP.com Disclosure Number: IPCOM000128391D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Sep-15
Document File: 2 page(s) / 15K

Publishing Venue

Software Patent Institute

Related People

K.E. Burkhalter, Jr.: AUTHOR [+3]

Abstract

This report supersedes two previous reports on this subject, and reflects changes incorporated to improve performance (that is, level converters have been added between the PDP-8 TTY lines, and the following logic). The accompanying diagrams illustrate an interface between AT&T 103A data sets and a standard PDP-8 processor and its associated online teletype (TTY). The interfaces provide: a. connection of the DEC online TTY to the dial switch network; b. connection of the DEC online TTY to the PDP-8; c. connection of the PDP-8 to the dial switch network.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

PDP-8 TO 103A DATAPHONE AND/OR ONLINE TELETYPE INTERFACE

THE UNIVERSITY OF MICHIGAN Memorandum 16 K.E. Burkhalter, Jr.,

CONCOMP: Research in Conversational Use of Computers F.H. Westervelt, Project Director ORA Project 07449

Supported by: ADVANCED RESEARCH PROJECTS AGENCY DEPARTMENT OF DEFENSE WASHINGTON, D.C.

CONTRACT NO. DA-49-083 OSA-3050 ARPA ORDER NO. 716

administered through: OFFICE OF RESEARCH ADMINISTRATION ANN ARBOR April 1968

PDP-8 TO 103A DATAPHONE AND/OR ONLINE TELETYPE INTERFACE

K.E. Burkhalter, Jr.

Further Notes on PDP-8/103A Interface

1 This report supersedes two previous reports on this subject, and reflects changes incorporated to improve performance (that is, level converters have been added between the PDP-8 TTY lines, and the following logic). The accompanying diagrams illustrate an interface between AT&T 103A data sets and a standard PDP-8 processor and its associated online teletype (TTY). The interfaces provide:
a. connection of the DEC online TTY to the dial switch network;
b. connection of the DEC online TTY to the PDP-8;
c. connection of the PDP-8 to the dial switch network.

Figure 1 illustrates the possible modes of operation.

(Image Omitted: Figure containing following caption omitted: Figure 1)

1 See also, Mills, D.L., Notes on PDP-8/103A Interfaces, Concomp Project internal memorandum, 25 September 1966; and Lundstrom, Stephen F., PDP-8/103A Dataphone Interface, Concomp Memorandum, November 1966.

University of Michigan Page 1 Apr 01, 1968

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PDP-8 TO 103A DATAPHONE AND/OR ONLINE TELETYPE INTERFACE

The interface takes care of interlocking the various features so that chaos can not reign supreme. Thus, the TTY can be used with its data set only if it is not attached to the 8. When the TTY is switched to the PDP-8, terminal ready drops on the TTY data set, disconnecting it from further use, so that contention is not a problem. The reader advance solenoid of the TTY is also brought TRUE at this time, so that the reader may be used with the data set by throwing the reader advance switc...