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Graphics meeting report (RFC0282) Disclosure Number: IPCOM000003419D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2019-Feb-13
Document File: 8 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M.A. Padlipsky: AUTHOR

Related Documents

10.17487/RFC0282: DOI

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 19% of the total text.

Network Working Group M. A. Padlipsky Request for Comments: 282 Project MAC NIC: 8164 December 8, 1971


The second Network Graphics Group Meeting was convened at the Stanford Artificial Intelligence Lab at 6:00p.m. Sunday, November 21st. (Attendees are listed in the Appendix.) Jim Michener served as chairman, and I either volunteered or was volunteered to serve as recording secretary, with Karl Kelly’s assistance in keeping notes.

An agenda was agreed upon for the meeting, covering three major topics: 1) reports on the experiments which had been set up at the July meeting, 2) prepared talks by attendees who had general points to raise about Network Graphics, and 3) specification of a "first- pass" graphics protocol. Before the reports were given, some general discussion was held on two important topics: the "context" problem (just how, in the Network sense, are graphics connections established, and who is supposed to do what for whom), and what might be called the "console types" problem (should there be a separate protocol for inherently static storage tube type devices and one for inherently interactive refresh type devices which have their own processors, or can we come up with some sort of continuous -- or layered -- single protocol which covers both). Both points were noted as being necessary to keep in mind for the protocol specification phase of the meeting, an apparent consensus emerged that a single protocol would be preferable, and the reports on experiments were turned to.



Eric Harslem of RAND and Ron Stoughton of UCSB reported on their experiment, which entailed use of the UCSB On-Line System (OLS) from RAND Videographics terminals. As demonstrated by a videotape which was shown, the experiment was successful. An RFC describing the simple protocol they used is forthcoming. As noted in their discussion and in the RFC, the experimental protocol is not being proposed as a Network standard. In addition to using OLS from RAND, a subsidiary experiment tested the sensitivity of the hook-up to variations in the size of the allocations (in the Host-to-Host Protocol sense) given at the RAND end. It seemed clear from the videotape of the same pictures being drawn at various allocation levels that larger allocations allow for noticeably smoother

Padlipsky [Page 1]

RFC 282 Graphics Meeting Report December 1971

"drawing" at maximum allocation, the picture essentially appeared all at once, whereas at minimum allocation, NCP-NCP overhead was sufficiently large that the picture appeared a portion at a time.


An experiment intended to input tablet data collected at MIT Project MAC’s Dynamic Modeling/Computer Graphics Group’s PDP-10 to a character recognizer package at SDC was reported on by Jean Saylor of SDC and Jim Michener of DMCG. Problems ranging from hardware/software difficulties at both ends (and in the middle) to time zone-induced system availability conflicts retarded the...