Browse Prior Art Database

Interfacing an Illinois plasma terminal to the ARPANET (RFC0600)

IP.com Disclosure Number: IPCOM000191623D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2010-Jan-10
Document File: 6 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Berggreen: AUTHOR

Abstract

The PLATO IV System based at the University of Illinois at Urbana is a highly sophisticated and very powerful approach to Computer Aided Instruction. The PLATO IV system makes use of a plasma display terminal that is a unique device with capabilities not presently found on computer terminals. A number of ARPA supported projects intend to use the plasma terminal on local connection to computer resources or by long-distance connection to the PLATO IV System.

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Network Working Group                                       A. Berggreen Request for Comments: 600              COMPUTER SYSTEMS LABORATORY--UCSB NIC: 20884                                                 November 1973

          INTERFACING AN ILLINOIS PLASMA TERMINAL TO THE ARPANET

INTRODUCTION

   The PLATO IV System based at the University of Illinois at Urbana is    a highly sophisticated and very powerful approach to Computer Aided    Instruction.  The PLATO IV system makes use of a plasma display    terminal that is a unique device with capabilities not presently    found on computer terminals.  A number of ARPA supported projects    intend to use the plasma terminal on local connection to computer    resources or by long-distance connection to the PLATO IV System.

   One problem in using the PLATO System from any appreciable distance,    is the communication costs involved (i.e. long-distance telephone    rates for many consecutive hours).  Also, use of the plasma terminal    in other applications is hampered since the communications scheme    employed in the PLATO System in non-standard.

   One approach to reducing the communications cost is to use the    ARPANET for the long-distance connection, since the Network is    potentially one of the most reliable and cost effective means of    transmitting computer data.  This approach is reasonable the is a    Network node near the PLATO System, (the PDP-11/ANTS system at the    Center for Advanced Computation at the University of Illinois at    Urbana) and with the increasing number of TIPS and IMPS on the    ARPANET access is becomming easier ad more widespread.

   The plasma terminals are designed to be connected directly to    telephone lines using Frequency Shift Keying (FSK) modulation.  Using    dedicated telephone lines, the plasma terminal may be run at a data    rate of 1200 bits/sec in full-duplex operation.  Using dial-up lines,    the terminal may be run with display information being received at    1200 bits/sec and data to the computer being transmitted at 120    bits/sec using a reverse chanel scheme.

   The data and command words used by the plasma terminal differ for    input and output.  Input received from the computer arrives in 20-bit    words plus one start bit.  Data transmitted to the computer is sent    in 11-bit words plus one start bit.

   In order to make the plasma terminal more generally applicable for    standard communication, and specifically adapted to the ARPANET    connection by way of a TIP, the terminal must be interfaced in such a

Berggreen                                                       [Page 1]
 RFC 600                ...