Raymond S. Tomlinson

MMConf: an infrastructure for building shared multimedia applications

Computer teleconferencing allows individuals scattered near and far to collaborate in writing a paper, negotiate over a budget spreadsheet, or cooperate in debugging a program. Our project focuses on applications that bring subject matter into a meeting, not on applications-such as voting or brainstorming tools-that aid the meeting process itself. We attempt both to support single-user applications running in the shared environment, and to provide a base for developing inherently shared applications.

TENEX, a paged time sharing system for the PDP - 10

TENEX is a new time sharing system implemented on a DEC PDP-10 augmented by special paging hardware developed at BBN. This report specifies a set of goals which are important for any time sharing system. It describes how the TENEX design and implementation achieve these goals. These include specifications for a powerful multiprocess large memory virtual machine, intimate terminal interaction, comprehensive uniform file and I/O capabilities, and clean flexible system structure. Although the implementation described here required some compromise to achieve a system operational within six months of hardware checkout, TENEX has met its major goals and provided reliable service at several sites and through the ARPA network.

The Monarch parallel processor hardware design

The Monarch architecture team took advantage of custom VLSI in the design of a shared-memory parallel processor. The simple structure eases the task of programming a massively parallel machine.<<ETX>>

Selecting sequence numbers

This paper discusses techniques for selecting and synchronizing sequence numbers such that no errors will occur if certain network characteristics can be bounded and if adequate data error detection measures are taken. The discussion specifically focuses on the protocol described by Cerf and Kahn, (1) but the ideas are applicable to other similar protocols.

Functions and structure of a packet radio station

A packet radio network is a digital broadcast channel, fixed and mobile digital terminals which are sources and sinks of information, stations which provide centralized routing control and interconnections to other networks, and repeaters which provide area coverage for mobile terminals by performing a store-and-forward function on the radio broadcast channel. An experimental testbed for these concepts is now under construction at the Stanford Research Institute, Palo Alto, California to provide experimental validation of theoretical models and simulation predictions.

TENEX, a paged time sharing system for the PDP-10

This paper appears in the March, 1972, issue of the Communications of the ACM. Its abstract is reproduced below. TENEX is a new time sharing system implemented on a DEC PDP-10 augmented by special paging hardware developed at BBN. This report specified a set of goals which are important for any time sharing system. It describes how the TENEX design and implementation achieve these goals. These include specifications for a powerful multiprocess large memory virtual machine, intimate terminal interaction, comprehensive uniform file and I/O capabilities, and clean flexible system structure. Although the implementation described here required some compromise to achieve a system operational within six months of hardware checkout, TENEX has met its major goals and provided reliable service at several sites and through the ARPA network.

A time shared I/O processor for realtime hybrid computation

There are economic advantages to time-sharing a facility with hybrid resources. It is quite unlikely that any single hybrid problem will be able to utilize all of the system resources 100 percent of the time. This is the same kind of reasoning that leads one to consider time-sharing for conventional digital problems. However, time synchronous real-time hybrid time-sharing and non-synchronous non-real-time digital timesharing are quite different problems, with the former posing some considerable difficulty to sequential digital machines.