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Time-Line computer Archive Ltd is a not for profit company, our aim is to collect, restore and exhibit all types of early computers and electronics.

We hope that our website will give an insight to the development of computing and will help give inspiration to other people to collect rather than throw out historical electronics.

We also would like to make a record of peoples experiences of early Computing and Electronics primarily from Scotland and the North of England but also from Great Britain generally. If you have any Experiences of early computing or Electronics please don't hesitate to contact us.

Analogue Computers

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Donner 3500







Extracts from the Donner 3500 user manual

“The model 3500 is a low-cost, portable , analog computer with very high performance characteristics.

Its ten-amplifier capacity (five integrators and five summers) is sufficient for handling a large

majority and a wide variety of computer applications.

The computer is fully self-contained within a small case and requires only a selection of plugin components

(resistors, capacitors, and patchcords) to be fully operational”.


“Being an analog device, whereby physical quantities are represented by computer voltages, the computer

may be used as an accurate model of an arbitrary physical system, thus saving immeasurable time in

engineering design, construction, and analysis.

System parameters are varied by adjusting the computer potentiometers.”


This particular “Analog computer” was used by “Ford Motor Company”

The Donner 3500 analogue Computer was first introduced in 1959/60.



Heathkit EC-1U