CHAPTER ELEVEN

HISTORICAL DEVELOPMENT OF COMPUTERS

11.3 . ELECTRO-MECHANICAL COMPUTERS

Electro-mechanical counting devices are those devices that use electronic parts and mechanical parts to perform their activities. These counting devices evolved between the mechanical counting devices and electronic devices. Some of the electro-mechanical devices are:

11.3.1. Zuse z3
11.3.2. Mark 1

11.3.1. Zuse z3

Z3 was an electromechanical computer designed by a German, Konrad  Zuse in 1941. It was the first programmable, automatic computing machine.

Features
Some of the features of Zuse z3 are:

  1. Size- bedroom wardrobe
  2. Internal components'-
  3. Input device.
  4. Output device.
  5. Storage- stores data on punched cards.

11.4.2. Mark 1
 Mark I was an electro-mechanical computer designed and built in 1944 by Howard H. Aiken of the IBM. It was used for computations by the U.S. Navy Bureau of Ships.

Features

  1. Size- size of a normal room
  2. Internal components- wire, switches, relays, rotating shafts, clutches etc
  3. Input device
  4. Output device-
  5. Storage- Data and information are stored on punched cards/papers.

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