ENIAC                             U. S. Army

The Report on the ENIAC consists of five separately bound parts, as follows:

1. ENIAC Operating Manual
2. ENIAC Maintenance Manual
3. Part I, Technical Description of the ENIAC
   Volume I (Chapters I to VI)
4. Part I, Technical Description of the ENIAC
   Volume II (Chapters VII to XI)
5. Part II, Technical Description of the ENIAC.

Included with the Operating Manual and Parts I and II of the Technical Description are all drawings (see Table 0.3 below) which are required for understanding these reports. The Maintenance Manual assumes access to the complete file of ENIAC drawings.

Part I of the Technical Description is intended for those who wish to have a general understanding of how the ENIAC works, without concerning themselves with the details of the circuits; it assumes no knowledge of electronics or circuit theory. Part II is intended for those who require a detailed understanding of the circuits. Its organization, to a great extent, duplicates that of Part I so as to make cross referencing between the two parts easy.

The ENIAC Operating Manual contains a complete set of instructions for operating the ENIAC. It includes very little explanatory material, and hence assumes familiarity with Part I of the Technical Description of the ENIAC. The ENIAC Maintenance Manual includes description of the various test units and procedures for testing, as well as a list of common and probable sources of trouble. It assumes a complete understanding of the circuits of ENIAC, i.e., a knowledge of both Parts I and II of the Technical Description of the ENIAC.

Online Table of Contents

Part I, Technical Description of the ENIAC

• Preface and list of drawings
• Chapter 1 -- Introduction
• Chapter 2 -- Initiating Unit
• Chapter 3 -- Cycling Unit
• Chapter 4 -- Accumulator

Part II, Technical Description of the ENIAC.

More to come...

Acknowledgement and Thanks

This document has been rendered machine readable thanks to the typing efforts of Monique Nguyen, LB&B, <Monique@ARL.MIL> (Preface and Chapter 1) and James R. Jackson, LB&B, <JJackson@arl.army.mil> (Chapters 2, 3, and 4).