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Graphics Protocol: Level 0 only (RFC0292)

IP.com Disclosure Number: IPCOM000003489D
Original Publication Date: 1972-Jan-12
Included in the Prior Art Database: 2000-Sep-13
Document File: 7 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J.C. Michener: AUTHOR [+5]

Abstract

This document reflects opinions expressed and decisions reached at the second meeting of the Network Graphics Group, held at the Stanford Artificial Intelligence Laboratory in late November 1971. It describes part of a proposed Network Standard Graphics Protocol for transmitting graphics data within the ARPA network. The particular aspects of the protocol covered in this document relate to the form and content of graphics information sent from a source of graphical information (an application program, say, in the "Serving Host") to a display package for output to a graphics console (at the "Using Host"). This will take the form of a sequence of 8-bit bytes, and will be called the graphics output byte stream. In particular, only the simplest forms of graphics data will be covered in this, the first version of this document. The next version, already in preparation, will be much more complete. In any case this is not intended to describe a finished protocol; rather it should serve as a basis for graphics experimentation on the network.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group 12 January 1972

Request for Comment: 292 Jim Michener, MAC

NIC 8302 Ira Cotton, MITRE

References: 282, 285 Karl Kelley, U. of Ill.

Updates: None Dave Liddle, Owens Ill.

Obsoletes: None Ed Meyer, MAC

GRAPHICS PROTOCOL - LEVEL 0 ONLY

INTRODUCTION

This document reflects opinions expressed and decisions reached at

the second meeting of the Network Graphics Group, held at the

Stanford Artificial Intelligence Laboratory in late November 1971.

It describes part of a proposed Network Standard Graphics Protocol

for transmitting graphics data within the ARPA network. The

particular aspects of the protocol covered in this document relate to

the form and content of graphics information sent from a source of

graphical information (an application program, say, in the "Serving

Host") to a display package for output to a graphics console (at the

"Using Host"). This will take the form of a sequence of 8-bit bytes,

and will be called the graphics output byte stream. In particular,

only the simplest forms of graphics data will be covered in this, the

first version of this document. The next version, already in

preparation, will be much more complete. In any case this is not

intended to describe a finished protocol; rather it should serve as a

basis for graphics experimentation on the network.

This document does not include form or content of graphics input

(data sent from the Using Host to the Serving Host) nor does it cover

how the connection is established between the hosts. A proposal for

the former will be generated eventually by this committee; the latter

is the job of the Connection Committee (of the Network Graphics

Group).

This RFC describes the commands which are available in the protocol

in terms of the effect they would have at the receiving (Using Host)

end. Clearly, some subroutine package is desirable at the Serving

Host for use by applications package in transmitting graphics data,

but on this topic this RFC does not intend to comment.

It may be observed by the reader that no facility is specified in

this protocol allowing the Using Host to report logical errors in the

graphics output byte stream to the Serving Host. Such a facility

would have to be intergrated with the graphics _input_ byte stream,

since it involves most of the problems related to synchrony of

independent hosts.

BACKGROUND

The reader should probably peruse RFC 282: "Graphics Meeting Report"

by Mike Padlipsky to obtain some of the framework surrounding this

discussion of network graphics. Also it might be valuable to make

note of the model described in RFC 285: "Network Graphics" by Donald

Huff.

LEVEL AND GROUND RULES PERTAINING THERETO

Functions w...