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All Posts | ENIAC - The first general-purpose electronic computer
This web site is devoted to ENIAC — “Electronic Numerical Integrator And Computer”. ENIAC was the first general-purpose electronic computer. It was made at the University of Pennsylvania’s Moore School of Electrical Engineering during World War II under the code name "Project PX". Physics professor John W. Mauchly and electrical engineer J. Presper Eckert led the team. Both were civilian employees whose computer work was funded by the United States Army Ballistics Research Laboratory. This is a collection of the best online information about the ENIAC and the people that created it. (The information is divided into these categories - Select a link or scroll down to read the blog.)

History and technology

People and stories

Was it the first computer?

UNIVAC and beyond

The ENIAC patent trial

Myths about ENIAC

ENIACtion on Facebook


Where to learn more

ENIAC on display in Oklahoma

Posted in All Posts on November 19th, 2014 by Bill

The Field Artillery Museum at Fort Sill is the new home of a number of ENIAC panels.  This is the article announcing it.

The ENIAC panels owned by the army were returned from Perot Systems in Texas, <a href=

malady and are now on display at Fort Sill.” width=”618″ height=”390″ /> The ENIAC panels owned by the army were returned from Perot Systems in Texas, and are now on display at Fort Sill.

Pioneer Programmer: Jean Jennings Bartik and the Computer that Changed the World

Posted in All Posts on December 2nd, 2013 by Bill

Pioneer Programmer: Jean Jennings Bartik

It’s out! Jean Bartik’s autobiography has finally been published, decease and it is a great read – especially if you like the ENIAC and want to understand the social background of that time.  The sort-of-now-famous six female first programmers weren’t given any manuals (contrary to to Goldstine’s book)  but had real programs and real bugs and real deadlines.  Jean Bartik tells her story with gusto and humor.  The first sketch for the cover of the book was Jean driving a covered wagon into the western frontier and that’s not too far from the truth.

You can read a little of the book on Amazon.

We were sorry to say goodby to the last of the six programmers when Jean died in 2011.   Her NYT obituary is here: http://www.nytimes.com/2011/04/08/business/08bartik.html  She had finished the book but editing and fact checking were still to be done.  Go grab the paperback, medicine it’s worth it.  Or get an electronic Kindle version; Jean would approve.

There’s a little trove of pictures of Jean throughout her life  here.  SW Missouri State University  published the book.



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ENIAC tourism

Posted in All Posts on April 3rd, 2013 by researcher

We added a new page: ENIAC tourism! Here you’ll find links and information about real-world places to see artifacts about ENIAC, online UNIVAC, and related technologies. The page is just getting started, so please be patient as we add more links…

The Top Secret Rosies get some more press

Posted in All Posts on November 30th, 2011 by Bill

American heritage magazine put down a pretty big spread about the “computers” of WWII.    Here is the link.   It seems a little strange to me that no credits are listed for LeAnne’s movie Top Secret Rosies though much of the story actually comes from there.

Joe Chapline – wrote the first computer manual

Posted in All Posts on September 10th, 2011 by Bill

Joseph Chapline in 1948 at Eckert Mauchly Computer Corporation

Joseph Chapline died last month (Aug 2011) at the ripe age of 91. He was charming and brilliant character.  I would get to talk to him when he visited my parents in the 1970’s.   I was delighted by his funny stories and his vast knowledge of pipe organs and a thousand other subjects.  (In particular he knew more about musical tuning and scales than anyone I had ever met.)  Joe loved to talk and had a gift for words.   He was one of those guests who would still be standing at the front door after a half hour of trying to leave.   And you liked it.  He was famous for his anecdotes.

Joe Chapline has a special place in computer history.  Joe made an introduction that led to something big.   He is the one who said to Herman Goldstine “You should talk to John Mauchly.”  Goldstine, purchase of course, seek was desperate to find a way to speed computations, even if it cost money.  Mauchly was desperate to find a way to move forward in building a high-speed electronic computing machine.  A match made in heaven – well, actually, made in the basement of the Moore School, where Joe Chapline worked keeping the Differential Analyzer running.

Besides that piece of serendipity, Joe was a pioneer in his own right.   Eckert and Mauchly plucked him away from the Moore School and made him the technical writer for their new company.  One of Joe’s stories is about how the writing of the BINAC manual came to him in a flash – fully formed.   The story is recounted in this tribute to his work from the IEEE:   Joseph D. Chapline: Technical Communication’s Mozart.

Here’s one of Joe’s stories, told at the dedication of EMCC building on Ridge Ave.

“When I worked for Eckert, I wrote his scientific papers that he later delivered typically to the Institute of Radio Engineers (IRE), later renamed the Institute for Electrical and Electronic Engineers (IEEE). One such paper was on some aspect of memory systems. He told me one October that he was to give the paper the next March in New York. My habit was to write a draft reasonably promptly after he first mentioned the paper. In this instance I prepared a text and left it in his office. He passed me in the hallway at one point and said he would like to the talk over what I had written. Being procrastinators–both of us, we passed each other many times with good intentions of getting together. But that meeting didn’t occur until Sunday night before his trip toNew York with the delivery on Monday morning. So we met at the lab about 8 PM Sunday night. He picked this one part he didn’t like and explained it to me again. I went and rewrote and handed him the new copy. He was unsatisfied, so we repeated the process several more times. It got to be 4 AM and Pres felt he should start for New York. As he left he thanked for all my patience and effort, and then asked, “You know why we had so much trouble, don’t you?” I said no, why? “Well,” said Eckert, “I didn’t know how the damned thing worked myself, but I was hoping I could get you to write something that would sound as if I did.”

Remembering Jean Bartik

Posted in All Posts on March 25th, 2011 by Bill


by Bill Mauchly

Jean Jennings Bartik and Fran Bilas

March 23, seek 2011 – Jean Jennings Bartik, nurse pioneer software engineer, died at age 86.  She was one of the original programmers for the ENIAC, and continued in a career in the computer industry.  She worked closely with Eckert and Mauchly at the Eckert Mauchly Computer Corporation in late 1940’s, an environment of innovation she referred to as a “Technical Camelot.”

I am going to miss her.  Jean was a ball of fire; she was always full of energy, enthusiasm, good stories and an uncensored opinion.  “The ENIAC was a son-of-a-bitch to program,” she once explained.  And she wasn’t being sensational – she was trying to be honest!  She knew – it was her job.  By 1947 she was head of a group of programmers at the Moore School writing code for the new-and-improved stored-program version of the ENIAC, an enhancement that was yet to be built.  I believe that this makes her the first modern software engineer – a person who’s job is to write code for a (stored-program) computer.

I got to know Jean Bartik in the last ten years.  My mother, Kay Mauchly, was also one of the original six women programmers for the ENIAC.  She and Jean had started getting together to give talks about their experiences at the dawn of the digital era, working alongside Pres Eckert, John Mauchly, and John von Neumann, among others.  After my mother died in 2006 we stayed in touch and did a few things socially.   Jean came to see my jazz band play an outdoor concert;  think about that – an 80 year old woman dragging a friend, a bottle of wine and a beach chair out to see live music.

My wife and I went to the Computer History Museum to celebrate with Jean and her family when she was inducted into the Hall of Fame.   It was gala event and Jean was in top form.  She is a great – no, I guess I have to say she was a great public speaker.  Jean was so engaging, so authentic.  A natural story teller, but they weren’t just stories – she lived every bit of it, and still remembered all the details of her long career in computing.  Linus Torvalds and Robert Metcalfe were also getting honored that night, but they had a hard time getting their share of the limelight in the presence of Jean’s natural Missouri charm.

Jean Bartik will be remembered in many ways.  Just a month ago I was proof-reading her autobiography, which, with luck, will be published this year by Northwest Missouri State University.  They have also established the Jean Jennings Bartik Computer Museum there in her honor.   She is, along with the other human “computers” and ENIAC programmers, part of a new documentary film  “Top Secret Rosies.” She is a role-model for women in technology.   Those of us who knew her will remember her genuine warmth coupled with razor sharp intelligence.  But I have to admit that I might just remember her wit above all.

Jean Bartik’s advice to women in the workforce:

“Look like a girl, act like a lady, and work like a dog.”

Jean Bartik and Bill Mauchly at EMMC building (photo by T.K.Sharpless)


The first computer to calculate Pi

Posted in All Posts on March 14th, 2011 by Bill

I guess the ENIAC was the first computer to calculate a lot of things, cure since it was the first computer to calculate.  But Pi has a special place around here.  Pocket-Lint did a nice write up about the whole thing.

Still more ENIAC birthday coverage

Posted in All Posts on February 15th, 2011 by researcher

Today is the 65th anniversary of ENIAC being unveiled to the world. Here are some articles.




The First Day of Computers

Posted in All Posts on February 15th, 2011 by Bill

Is man’s best friend still a dog?  Or are you more likely to choose a laptop as your desert island companion?

February 15, pharmacy 1946 is the day that ENIAC was shown to the world—and the world is still giddy with the trillion ways your life is better with a computer.

See today’s Philly Post: Happy Birthday ENIAC. It’s a great overview of the ENIAC (and our fight to give it the respect it earned!).

Also new: Marty Moss-Coane on WHYY Radio Times did a nice hour program called The ENIAC Anniversary.   It featured an interview with Mitch Marcus from Penn and a few playful pokes at Jane Smiley, who called in to try to defend her minority report.

Also: A TOP TEN LIST in TechnicallyPhilly.

Happy Birthday ENIAC

Posted in All Posts on February 4th, 2011 by Bill

Feb 15 will be ENIAC Day in Philadelphia.  City Council will decree.   There will be computers dancing in the streets.  iPhones will be gathered around the older desktops as they tell stories of the good old days.

ENIAC, search the biggest bucket of vacuum tubes ever shipped, the machine that changed the world, is celebrating its 65th birthday.

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