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THE UNIVERSITY OF MICHIGAN Memorandum 21 PORTATERM SOFTWARE

IP.com Disclosure Number: IPCOM000128384D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Sep-15
Document File: 8 page(s) / 33K

Publishing Venue

Software Patent Institute

Related People

Powers, V.M.: AUTHOR [+3]

Abstract

The Portaterm system is a collection of hardware and programs which provides remote graphical computer input and output through portable terminals. The programs discussed here read, store, and write sketches through low-bandwidth channels. Potential interactive applications include online simulation control, character recognition, and picture generation.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 13% of the total text.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

THE UNIVERSITY OF MICHIGAN Memorandum 21 PORTATERM SOFTWARE

V.M. Powers CONCOMP: Research in Conversational Use of Computers ORA Project 07449 F.H. Westervelt, Director supported by: DEPARTMENT OF DEFENSE, ADVANCED RESEARCH PROJECTS AGENCY, WASHINGTON, D.C.

CONTRACT NO. DA-49-083 OSA-3050 ARPA ORDER NO. 716 administered through: OFFICE OF RESEARCH ADMINISTRATION ANN ARBOR, May 1969

ABSTRACT

The Portaterm system is a collection of hardware and programs which provides remote graphical computer input and output through portable terminals. The programs discussed here read, store, and write sketches through low-bandwidth channels. Potential interactive applications include online simulation control, character recognition, and picture generation.

TABLE OF CONTENTS

ABSTRACT.....iii
1. INTRODUCTION.....1
2. SYSTEM COMPONENTS: HARDWARE.....2
3. ELECTROWRITER SUPPORT SYSTEM: SOFTWARE.....5
3.1 General.....5
3.2 Primitive Display File Structure.....5
3.3 Input Routines....9
3.4 Output Routines.....10
3.5 Action and Interaction: Modes of Operation.....11
4. VARIATIONS ON A SCHEME.....14
5. SUMMARY AND APPLICATIONS.....17
REFERENCES.....20

LIST OF FIGURES

FIGURE 1. Samples.....13
FIGURE l.l Input Samples.....13
FIGURE 1.2 Output samples.....13

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University of Michigan Page 1 May 01, 1969

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THE UNIVERSITY OF MICHIGAN Memorandum 21 PORTATERM SOFTWARE

LIST OF TABLES

TABLE 1. Symbolic List of the Contents of a Representative PDF.....8

[ chapter ] 1. INTRODUCTION

The Portaterm system is a computer graphics system with portable terminals. This report describes the Portaterm in action, the structure of the software, and the behavior of the system.

The Portaterm project was started in July 1967 under the direction of Prof. E.L. Lawler of the Department of Electrical Engineering at the University of Michigan, to develop a portable computer graphics terminal. It was believed that there are potential areas of application for a computer terminal capable of handling line drawings as input or output, yet light and compact enough to be portable. A relatively inexpensive system was devised, one with modest graphics capability compared with some of the sophisticated gear now in popular use, yet one which is capable of transmitting and/or receiving sketches between a digital computer and a remote location over the small bandwidth of voice-grade, dial-up telephone lines, using standard commercial equipment for the transmission interface.

[ chapter ] 2. SYSTEM COMPONENTS: HARDWARE

The Portaterm system as developed consists of drawing terminals connected to a small computer through conversion devices. Detailed descriptions of the equipment appear in another report. For the sake of discussion, however, a brief description of the major components is included here.

The terminal devices used were Victor Electrowriters. 1 The transmitter develops a signal which has two frequency...