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Home to the world's largest collection of working historic computers.

Follow the development of computing: from the Turing-Welchman Bombe and Colossus of the 1940s through the large systems and mainframes of the 1950s, 60s and 70s, to the rise of personal computing and the rise of mobile computing and the internet.

Recognised as one of England’s top 100 ‘irreplaceable places’, we welcome corporate and group visits, schools and individuals from all over the world.

The National Museum of Computing (TNMOC) is located on the Bletchley Park Estate but is independent of the Bletchley Park Trust.

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Featured video

TNMOC Mate | Accessible learning at TNMOC with Version 1

TNMoC

753 views

2 years ago

DEC at 60 | Oral Histories

Angela Shore | DEC UK 60th Anniversary

Angela Shore | DEC UK 60th Anniversary

308 views

1 year ago

Gerald Marsh | DEC UK 60th Anniversary

Gerald Marsh | DEC UK 60th Anniversary

224 views

1 year ago

Kevin Murrell | DEC UK 60th Anniversary

Kevin Murrell | DEC UK 60th Anniversary

228 views

1 year ago

Richard Briggs | DEC UK 60th Anniversary

Richard Briggs | DEC UK 60th Anniversary

225 views

1 year ago

David Lawrence | DEC UK 60th Anniversary

David Lawrence | DEC UK 60th Anniversary

439 views

1 year ago

David Probert | DEC UK 60th Anniversary

David Probert | DEC UK 60th Anniversary

1,068 views

1 year ago

Ken Salmon | DEC UK 60th Anniversary

Ken Salmon | DEC UK 60th Anniversary

164 views

1 year ago

Pete Lomas | DEC UK 60th Anniversary

Pete Lomas | DEC UK 60th Anniversary

180 views

1 year ago

Seymour Cray at 100 | TNMoC Talks

Seymour Cray at 100 | TNMoC Talks

1,581 views

2 months ago

Dark influence and information warfare | Virtual Talk

Dark influence and information warfare | Virtual Talk

461 views

3 months ago

Programming The WITCH | TNMOC Talks

Programming The WITCH | TNMOC Talks

709 views

5 months ago

Supporters Day 2025 - Large Systems Gallery - update

Supporters Day 2025 - Large Systems Gallery - update

335 views

7 months ago

The computer that ran a nuclear power station | Ferranti Argus 500 | TNMOC Talks

The computer that ran a nuclear power station | Ferranti Argus 500 | TNMOC Talks

1,493 views

7 months ago

Linux Demystified | Virtual Talk

Linux Demystified | Virtual Talk

752 views

1 year ago

Introducing Colossus | Virtual Talk

Introducing Colossus | Virtual Talk

3,701 views

1 year ago

"20 GOTO 10" Retro Computer Facts | TNMOC Talks

"20 GOTO 10" Retro Computer Facts | TNMOC Talks

1,485 views

1 year ago

Personal Recollections of Brigadier John Tiltman | TNMOC Talks

Personal Recollections of Brigadier John Tiltman | TNMOC Talks

829 views

1 year ago

Using Colossus with Russian teleprinter traffic | Virtual Talk

Using Colossus with Russian teleprinter traffic | Virtual Talk

4,804 views

1 year ago

Kino and Kinder: A Family’s Journey in the Shadow of the Holocaust | TNMOC Talks

Kino and Kinder: A Family’s Journey in the Shadow of the Holocaust | TNMOC Talks

225 views

1 year ago

Listening to the Enemy - Mike Griffiths | Talk

Listening to the Enemy - Mike Griffiths | Talk

4,502 views

2 years ago

Colossus at 75 - The Event: Wrens remember Colossus in the run-up to D-Day 1944 Video 2 of 2

Colossus at 75 - The Event: Wrens remember Colossus in the run-up to D-Day 1944 Video 2 of 2

1,595 views

6 years ago

Colossus at 75 - Colossus at D-Day 1944 Video 1 of 2

Colossus at 75 - Colossus at D-Day 1944 Video 1 of 2

1,989 views

6 years ago

Colossus at 75, ITV Anglia News 29 May 2019

Colossus at 75, ITV Anglia News 29 May 2019

3,843 views

6 years ago

Lorenz, Colossus and the Dream of a Universal Machine for Cryptanalysis

Lorenz, Colossus and the Dream of a Universal Machine for Cryptanalysis

36,357 views

9 years ago

Colossus at 70

71,039 views

11 years ago

The Colossus Rebuild in action

The Colossus Rebuild in action

61,314 views

12 years ago

Uncovering Colossus - Prof Brian Randell

Uncovering Colossus - Prof Brian Randell

113,883 views

12 years ago

Ask The Experts | Detailing Colossus

Ask The Experts | Detailing Colossus

5,309 views

5 years ago

EDSAC - November 2020 COVID-19 update

EDSAC - November 2020 COVID-19 update

2,579 views

5 years ago

EDSAC delay line storage - early computer memory

EDSAC delay line storage - early computer memory

9,945 views

5 years ago

Making everything count - EDSAC reconstruction update, January 2018

Making everything count - EDSAC reconstruction update, January 2018

3,734 views

7 years ago

EDSAC - Reflecting on a Vision

EDSAC - Reflecting on a Vision

5,561 views

8 years ago

EDSAC team meeting discussion, Spring 2017

EDSAC team meeting discussion, Spring 2017

3,527 views

8 years ago

EDSAC Update: a Team Meeting - the 'coffin', March 2017

EDSAC Update: a Team Meeting - the 'coffin', March 2017

763 views

8 years ago

Sourcing components for the EDSAC reconstruction

Sourcing components for the EDSAC reconstruction

871 views

8 years ago

Joining the Dots - Progress with EDSAC December 2015

Joining the Dots - Progress with EDSAC December 2015

1,376 views

10 years ago

EDSAC Veterans

1,264 views

9 years ago

What store for the EDSAC reconstruction?

What store for the EDSAC reconstruction?

1,197 views

12 years ago

EDSAC project meeting at Cambridge University, October 2013

EDSAC project meeting at Cambridge University, October 2013

1,011 views

12 years ago

Getting ready to begin reconstruction of EDSAC at TNMOC

Getting ready to begin reconstruction of EDSAC at TNMOC

1,085 views

11 years ago

Harwell Dekatron / WITCH

The story of the WITCH, the world's oldest working digital computer

The story of the WITCH, the world's oldest working digital computer

10,929 views

9 years ago

The reboot of the Harwell Dekatron / WITCH computer, the world's oldest working computer

The reboot of the Harwell Dekatron / WITCH computer, the world's oldest working computer

78,525 views

13 years ago

Harwell Dekatron / WITCH Reboot tnmoc.org

Harwell Dekatron / WITCH Reboot tnmoc.org

1,075,908 views

13 years ago

Atomic computing comes to Wolverhampton | TNMOC Talk

Atomic computing comes to Wolverhampton | TNMOC Talk

2,190 views

4 years ago

Ferranti Argus 500 - restoration and demonstration | 1960's computer

Ferranti Argus 500 - restoration and demonstration | 1960's computer

6,413 views

3 years ago

DEC PDP-11/70 - NPL Scrapbook - restoration and machine tour | 1970's computer

DEC PDP-11/70 - NPL Scrapbook - restoration and machine tour | 1970's computer

17,877 views

3 years ago

Teletype ASR-33 Restoration

Teletype ASR-33 Restoration

2,386 views

3 years ago

Inside Acorn: the story behind the BBC Micro

1. Best of seven: why Acorn built the BBC Micro | BBC Micro at 40

1. Best of seven: why Acorn built the BBC Micro | BBC Micro at 40

2,733 views

4 years ago

2. A week to remember: race to the BBC Micro prototype | BBC Micro at 40

2. A week to remember: race to the BBC Micro prototype | BBC Micro at 40

1,605 views

4 years ago

3. From teething problems to rattling Apple | The BBC Micro at 40

3. From teething problems to rattling Apple | The BBC Micro at 40

1,474 views

4 years ago

4. Basic and ARM: engineering expertise inside the BBC Micro | BBC Micro at 40

4. Basic and ARM: engineering expertise inside the BBC Micro | BBC Micro at 40

5,474 views

4 years ago

5 . Impact and legacy of the BBC Micro | BBC Micro at 40

5 . Impact and legacy of the BBC Micro | BBC Micro at 40

1,482 views

4 years ago

Generation Beeb: growing up with the BBC Micro

BBC Micro at 40 - Vince Clarke

BBC Micro at 40 - Vince Clarke

4,334 views

4 years ago

BBC Micro at 40 - Charles Moir

BBC Micro at 40 - Charles Moir

815 views

4 years ago

BBC Micro at 40 - Alex Gollner

BBC Micro at 40 - Alex Gollner

811 views

4 years ago

BBC Micro at 40 - Eben Upton

BBC Micro at 40 - Eben Upton

629 views

4 years ago

BBC Micro at 40 - Jeremy Ruston

BBC Micro at 40 - Jeremy Ruston

595 views

4 years ago

BBC Micro at 40 - Alex van Someren

BBC Micro at 40 - Alex van Someren

561 views

4 years ago

BBC Micro at 40 - Conrad Wolfram

BBC Micro at 40 - Conrad Wolfram

464 views

4 years ago

BBC Micro at 40 - Laura Gilchrist

BBC Micro at 40 - Laura Gilchrist

406 views

4 years ago

BBC Micro at 40 - Amy Worrall

BBC Micro at 40 - Amy Worrall

325 views

4 years ago

BBC Micro at 40 - Peter Thomas

BBC Micro at 40 - Peter Thomas

261 views

4 years ago

BBC Micro at 40 - Tanya Fish

BBC Micro at 40 - Tanya Fish

228 views

4 years ago

Language Makers

Tony Hoare | Building the future with Algol 60

Tony Hoare | Building the future with Algol 60

4,088 views

5 years ago

Power, responsibility - and transforming the web | The JavaScript story | Part 2

Power, responsibility - and transforming the web | The JavaScript story | Part 2

274 views

5 years ago

Power, responsibility - and transforming the web | The JavaScript story | Part 1

Power, responsibility - and transforming the web | The JavaScript story | Part 1

383 views

5 years ago

Building the unexpected: C++, Pt 2 | Twitter Q&A

Building the unexpected: C++, Pt 2 | Twitter Q&A

457 views

5 years ago

Building the unexpected: C++, Pt 1

Building the unexpected: C++, Pt 1

995 views

5 years ago

James Gosling: idealism, the Internet and Java, Pt 2 | Twitter Q&A

James Gosling: idealism, the Internet and Java, Pt 2 | Twitter Q&A

602 views

5 years ago

James Gosling: idealism, the Internet and Java, Pt I

James Gosling: idealism, the Internet and Java, Pt I

2,871 views

5 years ago

Ask The Experts

Ask the Experts | How to build a national museum of computer history

Ask the Experts | How to build a national museum of computer history

965 views

4 years ago

Ask The Experts | Will Flossie ever run again?

Ask The Experts | Will Flossie ever run again?

1,527 views

5 years ago

Ask The Experts | Detailing Colossus

Ask The Experts | Detailing Colossus

5,309 views

5 years ago

Ask The Experts | Will CSIRAC ever run again?

Ask The Experts | Will CSIRAC ever run again?

1,346 views

5 years ago

Ask The Experts | Relics of computing history - Booth and binary

Ask The Experts | Relics of computing history - Booth and binary

522 views

5 years ago

Ask the Experts | How many codebreaking machines were built?

Ask the Experts | How many codebreaking machines were built?

830 views

5 years ago

Ask The Experts | Colossus block diagram

Ask The Experts | Colossus block diagram

761 views

5 years ago

Ask the Experts | The Impact of Churchill's Post-war Colossus Strategy

Ask the Experts | The Impact of Churchill's Post-war Colossus Strategy

608 views

5 years ago

Ask the Experts | Turing and the Sinclair Spectrum

Ask the Experts | Turing and the Sinclair Spectrum

1,130 views

5 years ago

Ask the Experts | Why choose the NeXTcube to develop the WWW?

Ask the Experts | Why choose the NeXTcube to develop the WWW?

968 views

5 years ago

Ask the Experts | Why did the British lose to the Americans in the home computer market?

Ask the Experts | Why did the British lose to the Americans in the home computer market?

934 views

5 years ago

Ask the Experts | The role of the valve in computers

Ask the Experts | The role of the valve in computers

873 views

5 years ago

Fascinating Facts

Fascinating Fact | Colossus

Fascinating Fact | Colossus

1,112 views

5 years ago

Fascinating Fact | EDSAC | How many bits?

Fascinating Fact | EDSAC | How many bits?

576 views

5 years ago