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Information Technology Pioneers

 Retirees and former employees of UNISYS, Lockheed Martin, and their Twin Cities heritage companies.
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  51. 24-bits   52. 30-bits   53. 18-bits   54. 16-bits   55. 32-bits   56. 36-bits   57. Air Force Units   58. Others   59. Comm'l Processors    

1. Introduction to Commercial Computers

UNISYS is proud to claim that we possess the world's longest unbroken series of computers which started when ERA received government permission to market a commercial version of the then  'classified' Atlas computer.  ERA had shipped the Atlas to the National Security Agency predecessor's cryptography department in October of 1950.  It was fully operational in December 1950 - the world's first stored program computer in a customer's facility.

The UNIVAC/UNISYS 1100 series of computers began with the 1101, a number coined by the Atlas installation engineer, Jack Hill, because it was developed under Task 13 - 13 in binary is 1101.  This product line series has evolved to today's 2000 series of UNISYS business computers.  Ron Q. Smith described this history in the attached slide series.
The two computer tree figures below show the four decade relationship of this computer line.  Information about all of these computers is listed in a spread sheet file, click here to read it.

Click scroll down to:

  1. Introduction [left]
  2. Computer Tree, 1950-1963 w/Bit Saver references documents
  3. Early Computer Customer Lists
  4. Computer Tree, 1962-1980
  5. Repertoire Cards
  6. Technical Manuals

Introduction continued:

  The time relationships of the other UNIVAC computers developed in Philadelphia are shown on these trees as are the RCA and Varian computers which were bought out by UNIVAC. The early time relationships of the early defense industry computers which began with ERA are also shown.


Page 59 updated  1/25/2016.

2. Computer Tree, 1950 - 1963

2.1 Early Computer References

The bit-savers web site (http://bitsavers.informatik.uni-stuttgart.de/) has over 32,000 documents. We've copied and linked the documents associated with the early computer systems for research convenience.

UNIVAC File-Computer Programming Card (U-1717).PDF, scanned by Keith Myhre at the Lawshe Memorial Museum


3.0 Early Computer Customer Lists

Our initial customers for these computer lines have been captured in a document by Ron Q. Smith, some of his information came from George Gray.   

The ending point of the first tree (above) and the starting point of the second tree (below) is the 1107 computer shown in this photo at the right. A discussion about the 1108, the multi-processor son of the 1107 is in another attached document


4.0 Computer Tree, 1962 - 1980

5. Repertoire Cards

Many people gave repertoire cards  to the Legacy Committee.  Keith Myhre scanned the cards before they were donated to the Charles Babbage Institute. The commercial computer cards are linked hereunder. There are copies of some of these cards at the Lawshe Memorial Museum. 

6. Technical Manuals

The bit-savers web site (http://bitsavers.informatik.uni-stuttgart.de/) has over 32,000 documents. We've copied and linked the documents associated with the computers in the two genealogy charts above for technology researchers ease of access. Note that the 1101, 1103, and defense computer series documents are linked from the various bit-length pages.

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