PACE TR-20 electronic analogue computer

Made by Electronic Associates Inc in Long Branch, New Jersey, United States, North and Central America, 1965.

The PACE TR-20 was the teaching model for analogue computing as it was a perfect representative of the range of transistorised desktop computers available in the 1960’s. ‘Introduction to Analog Computation’ references the TR-20 as typical of its type of small desk top computers built by various manufacturers.

This model was used by the Electrical Engineering Department of the University of Technology Sydney (then the NSW Institute of Technology), to train engineers in the use of analogue comput...


Object No.


Physical Description

The TR-20 is composed of solid state electronic components occupying the area above the slanting control panel. Below the middle pre-patch panel is the monitoring and control area which contains the on/off switch, mode control of the computer, and measuring stationary problem voltages. A hinged cover plate directly below the control panel covers the amplifier balancing potentiometers and the variable diode function generators.

This model of TR-20 is equipped with a pre-patch panel that allows the middle panel to be removed and programs patched into the interface while away from the computer. The pre-patch panel consists of a rigid aluminium frame with individual rows that contain patching blocks identical to the front panels of the components. Contact is achieved between the pre-patch panel and the computing components by means of gold plated contact springs.

This model has spare patch panels and other spare components. There is also three hand drawn diagrams that show how to program a differential equation on this machine.



Designed and manufactured by Electronic Associates Inc., New Jersey, USA in 1965. PACE TR-20 production began in the 1960’s replacing the pace TR10. It was designed as a small desktop model that could be connected to other EAI products to increase computing ability. The PACE TR-20 was based on a building block concept where individual computing components could be connected into more complex systems.


Electronic Associates Inc 1965



The EAI TR-20 is the quintessential example of a transistorised desktop analogue computer of the1960s. An analogue machine does not perform its computations by serial calculation, like a calculator or digital computer. This allowed for faster processing time making analogue computers such as this more effective for solving some problems or simulations than digital computers of the time.

This computer was used by the University of Technology, Sydney, then the NSW Institute of Technology, Electrical Engineering Department from its purchase in 1965 until 1980 to teach problem solving on analogue computers.


NSW Institute of Technology 1965-1980


Credit Line

Gift of the University of Technology, Sydney, 2017

Acquisition Date

31 May 2017

Cite this Object


PACE TR-20 electronic analogue computer 2018, Museum of Applied Arts & Sciences, accessed 18 March 2018, <>


{{cite web |url= |title=PACE TR-20 electronic analogue computer |author=Museum of Applied Arts & Sciences |access-date=18 March 2018 |publisher=Museum of Applied Arts & Sciences, Australia}}

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