NDLI: A static magnetic memory system for the ENIAC

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History of mechanical computing machinery

Evolution of automatic computation

Special-purpose digital data-processing computers

The Elecom 100 general purpose computer

The Quadratic Arc Computer

A system for counting and recording electrical impulses in printed decimal form

The logical organization of the new IBM scientific calculator

Some engineering problems requiring automatic computation

Solution of systems of linear inequalities on a digital computer

Computational problems of linear programing

Small problems on large computers

Firing table computations on the Eniac

Small-scale research and automatic computing machinery

Use of computing machinery in applications of information theory

An upper bound on the informational capacity of a synapse

The maze solving computer

A chart method for simplifying truth functions

Standardised printed circuit units for digital computers

Nonlinear switching elements

Optical elements for computers

The selenium rectifier: a non-linear and assymetric resistance element

Construction and use of subroutines for the SEAC

High order matrix computations on the UNIVAC

The solution of boundary value problems by the method of the kernel function

Boundary value problems for multiply connected domains

Digital storage using ferromagnetic materials

Some recent research on ultrasonic propagation in solid media

Static magnetic memory: its applications to computers and controlling systems

A static magnetic memory system for the ENIAC

Magnetic binaries in the logical design of information handling machines

The use subroutines on SWAC

The use of sub-routines in programmes

Progress of the whirlwind computer towards an automatic programming procedure

The education of a computer

Formal logic and switching circuits

Theorem minimization

A method for synthesis of two-valued feedback circuits

Characteristic numbers and their use in the decomposition of switching functions

Rectifiers as elements of switching circuits

The theory of counting techniques

The application of counting techniques

A static magnetic memory system for the ENIAC

Content Provider	ACM Digital Library
Author	Auerbach, Isaac L.
Abstract	A parallel static magnetic memory system was designed to increaseby 100 words the fast access-time memory capacity of the ENIAC. Atpresent the ENIAC has only 20 words of internal memory, in the formof electronic accumulators. This small memory capacity limits thesize of the problem that can be programmed without repeatedreference to the external punched-card memory. The addition of 100words to the memory capacity will not only enhance the ease ofprogramming problems for the ENIAC but will also increase theover-all speed of computation by reducing the number of referencesto the slower access-time magnetic drum memory system.Magnetic memory devices have been under development in a numberof laboratories throughout the country for more than three years.At the Harvard Computation Laboratory magnetic shift registers thatuse rectangular hysteresis-loop magnetic materials have beendeveloped. Their new Mark IV Computer contains 200 words of thesemagnetic shift register memories. The Digital Computer Laboratoryof MIT, and more recently the Research Laboratories of RCA, haveinvestigated static magnetic memory systems of thecoincidence-current type.In November 1951 the Ballistics Research Laboratory of theAberdeen Proving Ground requested the delivery of a static magneticmemory system for the ENIAC. The time schedule implied that thesystem had to be designed from proven techniques, thus eliminatingthe possibility of extensive laboratory development. In addition,the peripheral electronics required for code conversion and controlimposed other conditions on the system that further limited thefreedom of design. One system that had already been demonstrated inour laboratory was well suited to the ENIAC requirements, andalthough not the optimum in magnetic memories, could be appliedimmediately to the problem. This system has the followingdistinctive characteristics:(1) It utlizes one magnetic core with two windings and onegermanium diode per bit of memory.(2) The magnetizing force applied to a core is always ofsufficient magnitude to switch the core, that is, the system is notamplitude-sensitive.(3) Information is stored in and extracted from the matrixmemory in parallel.(4) Read-out is inherently destructive, but the data isimmediately restored to the core matrix by the associatedelectronics.(5) No power is needed to hold information in the cores, andinformation is not lost in case of power failure.(6) It operates at pulse repetition rates from push button to125 kilocycles per second, therefore it can provide an excellentspeed match or buffer between systems.This paper will be presented in three parts:(1) A description of the basic memory matrix and a descriptionof how data is stored and extracted.(2) A review of the experimental results of a four by fourmatrix memory.(3) The system as designed for the ENIAC, and some of itsconstruction features.
Starting Page	213
Ending Page	222
Page Count	10
File Format	PDF
DOI	10.1145/609784.609813
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1952-05-02
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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