Home > Update Information

Minor updates to this site are constantly being made.  Photographs and page content are being reviewed and improved where appropriate.  Listed here are the more significant updates.

You may also be interested in the updates to the associated sites: Vintage British Calculators and Bell Punch Company and the ANITA calculators.

 

1st November 2024

• Added extra information to the article about the Goudime Astronavigation Calculator prototype.

6th February 2024

• Added Privileg to the Calculator Companies section.

9th December 2023

• Added a new calculator article "Purchasing an HP-35 Calculator in 1972".

17th October 2023

• Added a link to the 'Vintage Calculators Collectors United!' Facebook group on the Calculator Discussion Groups page.

12th September 2023

• Added photographs and explanation of the featured calculator Casio AL-8S being "Year 2000 Compliant".

26th January 2023

• Added Olivetti Elettrosumma 22 '10-key add-lister' to the Featured Mechanical Calculators section.

19th November 2022

• Added Sony SOBAX 400W to the Featured Desktop Calculator section and Sony to the Calculator Manufacturers section.

12th September 2022

• Added Heathkit OCW-1401 'Aircraft Navigation Computer' to the page on Navigation Calculators.

5th March 2022

• Added Suntory electronic calculator combined with soroban (abacus) to the Featured Hand-held Calculator section.

21st January 2022

• Added article about the Goudime Astronavigation Calculator - A Prototype Navigation Calculator from 1975 based on the the Intel 8080 Microprocessor.

16th October 2021

• Added news item Exhibition of early electronic calculators at the Higher Polytechnic School of Huesca, belonging to the University of Zaragoza (Spain), to open in November 2021.

1st October 2021

• Added new article 'Calculators for the Blind' with news items about early electronic calculators with Braille and audio outputs.

22nd September 2021

• Added news item about the death of Clive Sinclair.

21st August 2021

• Added new page on the Corvus Corporation calculator company and its parent Mostek Corporation.

22nd July 2021

• Added new article 'Audio Recording of 1967 Sales Talk for Marchant Adding Machines'.  A sales talk from 1967 urging the salesmen of SCM (Smith-Corona Marchant) to sell more Marchant adding machines.

29th April 2021

• Added the Card HP-35 Marketing Item to the HP-35 page.

20th January 2021

• Added the auction of the Texas Instruments 'Cal-Tech' prototype hand-held calculator to the Latest Vintage Calculator News page.

16th January 2021

• Added the operating manual for the Twin Marchant.

7th December 2020

• Added the article Calculator Inventory Tags.

21st November 2020

• Added Burroughs C3155 and Burroughs C3260 to the Sharp QT-8D page in the Featured Desktop Calculators section.

5th October 2020

• Added Olympia CD 102 and Olympia CD 202 to the Olympia CD 100 page in the Featured Portable Calculators section.

23rd September 2020

• Added Data Devices Brock 880/1 to the Featured Desktop Calculator section.

20th August 2020

• Added Olivetti Quanta 20 and Olivetti Summa Prima 20 to the Featured Mechanical Calculator section.

14th August 2020

• Added "Sumlock on Fatigue: Advice to Sumlock Operators" pdf document.

26th July 2020

• Merged the Bowler Countess page with the Resulta page to form a new Wheel Calculators page in the 'Featured Mechanical Calculators' section, and added addipresto.

25th July 2020

• Added Royal IC-130 to the 'Featured Electronic Calculators' section.

13th June 2020

• Added Olympia CD 100 to the 'Featured Portable Electronic Calculators' section.

11th June 2020

• Improved and added more photographs to the Calculator Displays page, especially the VFD section.

15th May 2020

• Added new page Links: Calculator Manuals with sources for calculator operating and service manuals.

1st May 2020

• Added information and photographs about the 'COS' technology in the Sharp EL-805 early LCD calculator.

19th April 2020

• Added ABRAXAS calculator, with battery module which connects directly to the AC supply, to the 'Monte Carlo & similar models' page of the 'Featured Hand-held Calculators' section.

February - April 2020

• Added many new entries to the Vintage Calculator Photo Library & Calculator Book Addendum section - these are indicated by the date alongside them.

6th March 2020

• Added Texas Instruments Little Professor mathematical learning aid/game to the Featured Hand-held Electronic Calculator section.

26th February 2020

• Added Hewlett-Packard HP-41CX to the Featured Hand-held Electronic Calculator section.

30th January 2020

• Added information about the early Rockwell PPS-4 microprocessor system used in the Rockwell 920 desktop calculator.

19th December 2019

• Added more information and photographs to the article "RCA Calculators (or are they space helmets ?)".

25th October 2019

• Added CHECK-A-BET Multi betting shop calculator to the Featured Desktop Electronic Calculator section.

22nd October 2019

• Added alco Mickey Math to the Featured Hand-held Electronic Calculator section.

21st September 2019

• Added Casio pocket-LC and Casio pocket-LC II to the Featured Hand-held Electronic Calculator section.

16th September 2019

• Added Sears C1 to the Featured Desktop Electronic Calculator section and the Solitron SR30 to the "One Hit Wonders" article.

8th May 2019

• Added Canon Palmtronic LE-80M to the Canon Palmtronic LE-10 page.

10th April 2019

• Added Gérald Saudan's book about the H.W. Egli company of Switzerland and its development of The Millionaire and MADAS mechanical calculators.

5th April 2019

• Added The Millionaire to the Featured Mechanical Calculators section.

9th March 2019

• Calculator News page: Added announcement of the death of Jerry Merryman (who was was a member of the team at Texas Instruments that developed the 'Cal-Tech', the prototype hand-held calculator).

4th March 2019

• The British Calculators section has been moved to its own website, http://www.vintagebritishcalculators.info/index.html, so links will now direct to this site where appropriate.

27th January 2019

• Added two versions of the Decimo Vatman, the Decimo Super Vatman and Decimo Super Vatman II to the Decimo page and ANITA 8031 to the Fi-Cord page of the British Calculators section.

14th January 2019

• Added information about the development of the RFT minirex calculators from East German to the Featured Hand-held Calculators section.

10th November 2018

• Faber-Castell TR1 added to the Featured Hand-held Calculators section.

17th October 2018

• Advance 161R added to the British Calculators section.

21st August 2018

• Hewlett-Packard HP 9100A added to the Featured Desktop Calculators section.

6th November 2017

• Abatron 808 and Advance 80 added to the British Calculators section.

16th September 2017

• Added SCM Marchant I calculator to the Featured Hand-held Calculators section.

15th August 2017

• Added Original Odhner LUSID £sd pinwheel calculator to the Non-Decimal Calculators section.

4th August 2017

• Added Astro Addiator to the Non-Decimal Calculators section.

8th July 2017

• Added photographs of circuit boards of the Sinclair Executive and updated that page in the Featured Hand-held Electronic Calculators section.

23rd April 2017

• Added two more versions of the Sinclair Executive to the page in the Featured Hand-held Electronic Calculators section.

27th February 2017

• Added the Accurate 100 electronic desktop calculator to the TEAL TL-2M page of the Featured Desktop Electronic Calculators section.

8th February 2017

• Added Ruby calculators section to the Advance Electronics page in the British Calculators section.

27th January 2017

• Added Marchant Figurematic to the Featured Mechanical Calculators section.

23rd January 2017

• Added article "Sterling Currency (£sd) Multiplication on a 12-key Add-Lister".

5th January 2017

• Added the Keon KE-003A to the "One-hit-wonders" page and an article on Keon Calculators from Australia to the Calculator Articles section.

15th December 2016

• Added Advance 162R to the Advance Electronics page in the British Calculator Companies section.

1st December 2016

• Added Imperial and Imperial 90K to the British Calculator Companies section.

22nd November 2016

• Added new section Featured Portable Electronic Calculators with hybrid AC / battery calculators Sanyo ICC-0081, Sanyo ICC-1417, ANITA 1011B LSI.

11th November 2016

• Added a page on the Durham University electronic calculator (a "proof-of-concept" of 1962) to the Featured Desktop Electronic Calculators section.

21st October 2016

• Added information and photographs about the two versions of TEAL PHOTON in the Featured Hand-held Electronic Calculators section.

7th October 2016

• Added page on the Casio CQ-1 calculator-clock to the Featured Hand-held Electronic Calculators section.

1st October 2016

• Added page on the Casio MQ-1 and MQ-2 calculator-clocks to the Featured Hand-held Electronic Calculators section.

23rd September 2016

• Page on the Sinclair Executive in the Featured Hand-held Electronic Calculators section completely rewritten with additional photographs and information.

20th September 2016

• Added Sinclair Scientific to the Featured Hand-held Electronic Calculators section.

29th June 2016

• Added Aristo M64 and Aristo M66S to the Featured Hand-held Electronic Calculators section and Aristo to the Calculator Companies section.

19th March 2016

• Added Daltone to the "One-hit Wonders" article.

15th March 2016

• Added Faber-Castell combined Addiator and slide-rule devices to the Featured Mechanical Calculators section.

22nd February 2016

• Added the IMPERIAL SOLAR-MINI to the Sharp EL-825 page in the Featured Hand-Held Electronic Calculators section.

5th December 2015

• Added the article Build a 'Retro' Calculator to the Calculator Articles section.

14th November 2015

• Added the article Replacing a defective Main Chip of a Novus 4525 Scientist PR to the Calculator Articles section.

29th September 2015

• Added the APH Student Speech+ to the TSI Speech+ page of the Featured Hand-held Calculators section.

19th May 2015

• Added the Casio micro-mini M800 & Casio micro-mini M810 to the Featured Hand-held Calculators section.

12th May 2015

• Added the page "Identifying Calculator Electronic Components" to the Calculator Technology section.

29th April 2015

• Added the page "Links to YouTube Videos" to the Calculator Resources section. Added the Mathatron and Olivetti programma 101 to the Featured Desktop Calculators section.

25th April 2015

• Added the article "The Calculator-on-a-Chip" to the "Calculator Articles" section.

22nd April 2015

• Added the Canon Pocketronic II to the "Featured Hand-held Calculators" section.

21st April 2015

• Added the TEALTRONIC LE-8 to the "Featured British Calculators" section.

17th April 2015

• Added the Texet 1 to the "Featured Electronic Hand-held Calculators" section and the Texet 1800 to the "Featured British Calculators" section.

16th April 2015

• Added the Toshiba BC-0801B and Addmaster Auditor 8KB to the "Featured Hand-held Electronic Calculators" section.

16th February 2015

• Added the article "The Development of the TSI Speech+ Calculator", the first speaking calculator, to the "Calculator Articles" section.

3rd January 2015

• Added the Fi-Cord Anita 1211, ANITA 8011 & ANITA 8041 to the Fi-Cord page in the British Calculators section.

25th August 2014

• Added the Addo Mod 16 10-key add-lister to the British Calculators section and the Sterling Currency Calculators section.

6th July 2014

• Added the Iain Jones International Phoenix/B to the "One Hit Wonders" page and the Texet Gyro-1 in the British Calculators section.

21st June 2014

• Added the POWERS¹⁰ to the "One Hit Wonders" page.

8th February 2014

• Added the Prinztronic C35 in the British Calculators section.

29th December 2013

• Added basic information about the operating principles of the electronics to the ANITA Mk8 page.

16th November 2013

• Added information about the new Bowmar LLC company to the Bowmar article.

27th July 2013

• Added Shibuya to the British Calculators section.

20th July 2013

• Added Phytron Analysis 14 to the Phytron page in the British Calculators section.

4th May 2013

• Added CB-888 to the Monte Carlo and similar tiny calculators page.

15th December 2012

• Added Elektronika B13-18A to the Featured Hand-held Calculators section.

2nd October 2012

• Added Calcutronic/Abatron 802 to the Abatron page in the British Calculator Companies section.

2nd July 2012

• Added Tealtronic K-80M (type 2) to the Tealtronic page in the British Calculators section.

16th June 2012

• Added NCR 1844 to the Busicom LE-100A page.

11th May 2012

• Added TEC EC-205G to the Sharp EL-825 page.

11th February 2012

• Added Sanyo CX-1 to the Featured Hand-held Electronic Calculators page.

4th February 2012

• Added page "Later Hand-held LCD Calculator Photograph Library".

28th January 2012

• Added Victor 3900 to the Featured Electronic Desktop Calculators page.

2nd January 2012

• Added Unifive Industries data brain II to the One Hit Wonders page, and Binatone CADET to the British Calculators section.

31st December 2011

• Added Binatone MEMORYMASTER, Decimo Handy, House of Fraser 44HF, Imperial 92M, Texet 1500, and Texet Secretary to the British Calculators section.

30th December 2011

• Added Radofin 1720 to the Check, Billfold, and Wallet Calculators page.
• Added Iain Jones International Phoenix 101 to the One Hit Wonders page.

29th December 2011

• Added BOND calculator to the Monte Carlo and Similar Calculators page.
• Added Litronix Checkmate version 2 to the Litronix Checkmate page.
• Added RES MARK IX to the One Hit Wonders page.

26th November 2011

• Added Ultramat SQR-2000 prototype electronic calculator to the Featured Desktop Electronic Calculators section.

16th November 2011

• Added Walther ETR3 to the Featured Hand-held Calculators section.

20th August 2011

• Added new article "SCAT and its Specialist Calculators: How a start-up company formed by a group of friends developed a successful series of advanced specialist calculators".

6th August 2011

• Added new section Hexadecimal & Octal Calculators to the Non-Decimal Calculator section, with the Octdat, Hexadat, and Texas Instruments Programmer.

30th July 2011

• Added the Olivetti Divisumma 18 to the Featured Hand-held Calculators section.
• Added the Sinclair Cambridge Calculator Kit to the Sinclair Cambridge page and the Sinclair Scientfic Calculator Kit to the Sinclair Scientfic page.

27th June 2011

• Added the Sharp EL-8008 to the page about Sharp reflective-LCD calculators.

30th May 2011

• Added the Sharp EL-826 early solar-cell powered calculator.

14th May 2011

• Added more information to the pages about the Sharp EL-8026 and Sharp EL-825 solar-cell powered calculators.

29th December 2010

• Added Prinztronic C20, Prinztronic Numberman M MEMORY, and Prinztronic SC1001M to the British Calculators section.

11th September 2010

• Added information about the Old Calculator Forum to the Calculator Forums page.

31st August 2010

• Added Decimo Super Vatman V.Sc. I to the British Calculators section.

14th August 2010

• Added aml LE-8 "TRAVELLER" to the British Calculators section.

31st July 2010

• Added Gemini 3 to the British Calculators section.

13th July 2010

• Added new article "The Twin Marchant and its place in history" to Collecting Calculators section.

12th June 2010

• Added information about the Twin Marchant to the Notes on Monroe and Marchant Calculators article.

5th June 2010

• Added Gross 681 and Imperial 12HT to the British Calculators section.

1st June 2010

• Added Litronix Checkmate and Monroe 10 to the Featured Hand-held Calculators section, Busicom Colex 812-SL to the British Calculators section.

3rd May 2010

• Added Sinclair Executive to the Old Calculator Advertisements page, and Advance Executive 16+2 to the British Calculators section.

24th April 2010

• Added Iain Jones International Mini to the One Hit Wonders page.

13th April 2010

• Added Hapco Porta Mark II to the One Hit Wonders page.
• Added Texet 1200 Student to the British Calculators section.

16th February 2010

• Added page Calculator Keyboard Layouts to the Calculator Technology section of this site.
• Added information about the Busicom HANDY LC LCD calculator.
• Added Gemini 1B to the Gemini page of the British calculators section.

16th January 2010

• Added Museum Calculator Displays page to the Calculator Resources section.

29th December 2009

• Improved and added more photographs to the page "The Pocket Calculator Race", and more emphasis placed on the development of the pocket calculator.

19th October 2009

• Added a page on Binatone calculators and also added the Ajax, Ajax 99, Decimo International (type 2) to the British calculators section.

19th September 2009

• Added the Fi-Cord MF 8 to the British calculators section.

13th July 2009

• Added Commodore N-60 and Tamaya NC-2 to the Navigation Calculators page.

14th June 2009

• Added information about the manufacturer of Regan calculators and recollections of manufacturing and inspecting hand-held calculators at Advance Electronics.

4th May 2009

• Added Hewlett Packard awarded the "IEEE Milestone in Electrical Engineering and Computing" for the HP-35 calculator to the Latest Vintage Calculator News section.

25th April 2009

• Added Busicom 141-PF / NCR 18-36, the first commercial product to incorporate a microprocessor, the Intel 4004, to the Featured Desktop Electronic Calculators section.
• Added "The calculator that spawned the microprocessor - The Busicom 141-PF calculator and the Intel 4004 microprocessor" to the Collecting Calculators articles.

10th April 2009

• Added Sharp PC-1210 Pocket Computer to the Featured Hand-held Calculators section.
• Added Radofin 1515 to the British Calculators section.

7th March 2009

• Added Comptometer Model-J Imperial-weight calculator to the Non-Decimal Calculators section.

26th February 2009

• Improved the early hand-held calculators in the Featured Hand-held Calculators section, added link to the World of Calculators Forum, the successor to the Vintage Calculators Forum, in the Calculator Forums Section.

21st February 2009

• Added Berkey Keystone 350 to the Featured Hand-held Electronic Calculators section.

8th February 2009

• Added Genie 247 and Sporting Life Super Settler to the page about betting-shop calculators in the Featured Desktop Electronic Calculators section.

2nd February 2009

• Added information about the history of Advanced Telecommunications Equipment (ATE) and updated the page about Radofin in the British calculators section.

31st January 2009

• Added aml Distributors Ltd. to the British calculators section.

17th January 2009

• Updated and expanded the Calculator Books section.

29th December 2008

• Added the Memory Devices Memory 808MD to the British calculators section.

9th December 2008

• Added the Texas Instruments "Cal-Tech" prototype to the Hand-held Calculator section.

1st November 2008

• Added ADDO Mod 9 to the British Calculators section.

27th August 2008

• Added information about the National Mueum of Computing at Bletchley Park, England.

8th August 2008

• Added page about Bletchley Park.

26th July 2008

• Added the news that the Museum of Computing, in Swindon, has been made homeless.

19th July 2008

• Added Caltec, Data Devices, and Tealtronic to the British Calculators section.

15th May 2008

• Added link to YouTube videos of old advertisements for calculators.

10th May 2008

• Added Sperry Remington SSR-8 and added Prinztronic M300 to the British Calculators section.

5th May 2008

• Added Casio AL-8S and added Plustron 908 to the British Calculators section.

22nd March 2008

• Added Prinztronic 4 and Prinztronic Scientific SC5001M to the British Calculators section.

17th March 2008

• Added SCAT THE DIMENSION feet & inches electronic calculator.
• Added page on Abatron calculators to the British Calculators section.

16th February 2008

• Added Calate 8, Gemini 1, Prinztronic 1001m and Prinztronic Program to the British Calculators section.

2nd December 2007

• Added Prinztronic SC2001m to the British Calculators section.

6th October 2007

• The enlarged 5th. edition of the "Guide to HP Handheld Calculators and Computers" published added to Vintage Calculator News section.
• Added Imperial 80CS, Imperial 81CS, and Imperial 1030 to the British Calculators section.

22nd September 2007

• Added Sharp EL-8026, the first calculator to use solar cells.
• Added Texet Pocket-8M and Texet Pocket-8MR to the British Calculators section.

15th September 2007

• Added page TI 58 Special Function Calculators.
• Added Sandvik Coromant 842S Cutting Data Calculator.

18th August 2007

• Added Decimo Da Vinci, Prinztronic Mini Scientific, and Radofin 2200 style 2 to the British Calculators section.

11th August 2007

• Added Gemini 2 and Radofin 1640 to the British Calculators section.

4th August 2007

• Added Novus Billfold 91 to the Check, Billfold, and Wallet Calculators page.

28th July 2007

• Added photograph of Casio Mini-Card LC-78G to the Mini-Card LC-78 page.

24th July 2007

• Hewlett Packard launches Retro HP 35s to Commemorate 35th Anniversary of First HP Handheld Calculator added to Vintage Calculator News section.
• Added photographs of MITS 908M, MITS 941M "Metric Converter", and MITS 1212 to MITS 150 page.

16th June 2007

• Added Cybio 004m.

29th May 2007

• Added Kosmos Astro.

27th May 2007

• Added new section Early Hand-held LCD Calculators Photo Library.

14th April 2007

• Added Decimo International to the British Calculators section.

9th April 2007

• Added Addo-X 9364 to the Sharp EL-8 page.
• Added Decimo Super Vatman M to the British Calculators section.
• Added Miracal to the One Hit Wonders article.
• Added Plustronic LE-806 to the British Calculators section.
• Added an Unknown Scientific Model to the Edmund Scientific 1945 & Similar Models page.

31st March 2007

• Added Imperial 94F to the British Calculators section.
• Added Plustron Educational 1 to the British Calculators section.

24th March 2007

• Added General Instrument to the Calculator Companies section.
• Added General Instrument EZ3000 and varities to the Featured Hand-held Calculators section.
• Added RBM Scientific to the One Hit Wonders page.

21st March 2007

• Added Decimo Vatman Spy to the British Calculators section.
• Added Prinztronic Micro II to the British Calculators section.

8th March 2007

• Added Geller (Business Equipment) Ltd., and the Geller Teal LE-8 to the British Calculators section.

24th February 2007

• Added Edmund Scientific 1945.

17th February 2007

• Added Calate Supacal and information about its manufacturer Advanced Telecommunications Equipment Ltd. (ATE) to the British Calculators section.

14th February 2007

• Added more photographs of the first pocket calculator the Busicom handy LE-120A.

29th December 2006

• Added Links to Vintage Technology Sites page.

8th November 2006

• Added the GEM calculator to the Addiators page.

14th October 2006

• Added extra information to the page about Rockwell and its calculators.

2nd September 2006

• Added Quik-Check wrist calculator.

29th May 2006

• Added new article "One Hit Wonders" to the Collecting Calculators section.
• Added Casio fx-10.
• Added Litronix Inc. to the Calculator Companies section.

13th May 2006

• Added Elorg 801 calculator from the U.S.S.R.
• Added Texas Instruments SR-10 electronic "Slide Rule".
• Added Texet Student to the British Calculators section.

7th May 2006

• Added Monte Carlo calculator.
• Added Decimo 2001-e, Decimo Super Vatman SS. I, Decimo Vatman Extra M, Decimo Vatman Extra S, and Decimo Vatman Student added the British Calculators section.
• Added all-black Sinclair Executive Memory.

1st May 2006

• Added Bowmar MX-55 & Hiradastatechnika Hungarian-made version.
• Added Sharp EL-8009, Sharp EL-8009S, Sharp EL-8015, and Sharp EL-8110 to Sharp EL-805 and other early Sharp LCD calculators page.
• Prinztronic 810N added.

17th April 2006

• Century Mark IV and Rockwell Anita 1216 added to Puzzle Corner.
• Page about Ajax calculators added to the British Calculators section.
• Added Radofin 1610, Radofin 1660, Triton 1000, and Triton 1400 to the Radofin page in the British Calculators section.

15th April 2006

• Allianz insurance calculator.
• Commodore C110.
• Slide rule.

8th April 2006

• Added Prinztronic models: c-mos 1, Financial, M500, MC99, Powerman.

27th March 2006

• Panasonic JE-8210U "Electronic Ruler" added.

11th March 2006

• History of Gross Cash Registers Ltd. added.
• Photographs of some of the displays at the Museum of Computing calculator exhibition added.

24th January 2006

• Details of Museum of Computing calculator exhibition added.

30th December 2005

• Decimo Vatman Scientific - added.

28th December 2005

• NCR 18-15 - added.
• Sharp EL-805 - added.

24th December 2005

• Added addional information about the pioneering calculator developments to the page about Sharp Corporation in the Calculator Companies section.

4th December 2005

• Added new section "Latest Vintage Calculator News".
• Added details of the award of IEEE Milestone in Electrical Engineering and Computing to Sharp Corporation.

15th October 2005

• Prinztronic LE-808P - added.
• Taktile 1200 - added.

8th October 2005

• Hanimex Calculator-Recorder - added.

1st October 2005

• Addo-X 9675 - added.

25th September 2005

• Texas Instruments TI-2511 - added.

21st September 2005

• Ramsgate M-11 - added.

13th August 2005

• Casio Mini Card LC-78 - added.
• Decimo Vatman Mini M - added.
• Decimo Vatman V.Sc I - added.

6th August 2005

• Boots 224 Memory and 425 Scientific - added.

26th July 2005

• Further photographs of inside the Anita Mk VII - added.

23rd July 2005

• Advance Electronics Ruby 800 - added.

18th July 2005

• Sinclair President Scientific - added.
• Photographs of the circuit boards and display modules of the Canon Canola 130S - added.

30th May 2005

• Canon Canola 130S - added.
• "Light-pipe" numerical display modules - added to Calculator Displays page.

15th May 2005

• Calculator Time-line - improved.

7th May 2005

• Imperial 81SR - added.

3rd May 2005

• Elektronika MK-33 - added.

2nd May 2005

• Announcement in 1961 about an electronic calculator from Electrosolids Corporation reinstated to the site now information is available.

30th April 2005

• Decimo Ready Reckoner - added.
• Plustron 508 and 608 - added.

26th April 2005

• Plustron fleximind, hand held calculator and game - added.

16th April 2005

• Page about Marchant Calculating Machine Company added.

6th April 2005

• SEC Navtronic and Texas Instruments Navigatronic - added.

2nd April 2005

• Hanimex BC 808 - added.

28th March 2005

• Thumbnail images added to the Calculator Photo Library.

24th March 2005

• Royal Digital III - added.

30th December 2004

• Bohsei 3000 and Goodyear G191 - added to "Standard Type 1" page.
• Decimo Handy M - added.
• Decimo Vatman Executive, LED version - added.

19th December 2004

• Readers' Queries section - added to the Puzzle Corner page.

24th November 2004

• Busicom "exec" 80-DA - added to the Busicom page.
• Gross 2031 - added.
• Teal LE-8 President - added to the Teal page.

2nd October 2004

• Casio ST1 - added.

19th September 2004

• An improved Site Search Engine - added.
• Unknown small calculator - added to UIT 85X page.

14th September 2004

• MITS 908M - added.
• Resulta - added.
• S & N / THE SUN adding machine - added.

19th July 2004

• Busicom LE-120A "HANDY-LE" - added.
• Calculator by Unknown Manufacturer - added to "Puzzle Corner".

24th June 2004

• Addmaster Indian currency calculator - added.

15th June 2004

• Busicom LE-80A "handy" - added.
• Facit 1106, Sharp EL-808, Sharp EL-8010 - added.

22nd May 2004

• Advertisement page moved to Photo Library section and more advertisements being added to it.

11th May 2004

• Prinztronic M800 - added.
• Prinztronic P200 - added.

8th May 2004

• House of Fraser 14HF - added.

3rd May 2004

• Phytron 32 - added.

18th April 2004

• Toshiba BC-1623G - added.

13th April 2004

• New major section "Calculator Companies" created.

9th April 2004

• Busicom LE-100A - added.
• Sporting Life Super Settler Mk II - added.
• Photographs of the circuit board of the Sinclair Sovereign added.

29th February 2004

• Busicom 802 - added.

21st February 2004

• Gemini 3 - added.

18th January 2004

• Busicom LE-120S "handy" - added.
• Sharp QT-8B "micro Compet" - added.

10th January 2004

• A brief history of Muldivo added to the Muldivo page.

28th December 2003

• Iain Jones International Addison Mini A - added.

26th December 2003

• Exactus Mini-Add - added.
• Prinztronic 80 - added.
• Prinztronic Countdown - added.
• Sperry Remington 661 - added.
• Teal Photon - added.

16th December 2003

• Rapid Data Rapidman 1208LC - added.

13th December 2003

• Adler Sir - added.
• Hewlett-Packard HP-80 - added.
• Sinclair President - added.

8th November 2003

• Operating manual for the Muldivo Mentor pinwheel calculator - added.

18th October 2003

• Triton 8 - added.
• Triton 1200 - added.

7th October 2003

• Plustron 808 - added.

27th September 2003

• Check Tronic and Corvus CheckMaster - added.
• Decimo Memory Man - added.
• Decimo Vatman Super Spy - added.
• Monroe LN-160X - added.
• Sinclair section improved.

9th August 2003

• Canon LE-10 - added.
• Sanyo ICC-808 - added.

5th August 2003

• Prinztronic MC95 - added.

2nd August 2003

• Sinclair Cambridge type 4 - added.

26th July 2003

• Pulsar calculator watch - added.

22nd July 2003

• NCR 18-16 / Busicom Junior - added close up of the Mostek 6010 "Calculator on a chip".
• Sinclair Oxford Universal - added.
• Summit K16 / Citaco K16 - added.
• Texas Instruments TI-2500 "Datamath" - page rewritten, including comparison of "Datamath" versions.

5th July 2003

• Busicom 100DA - added.
• Busicom 118B - added.

26th May 2003

• Article "Clive Sinclair and the Pocket Calculator" - added.

17th May 2003

• Sinclair Wrist Calculator - added.

6th May 2003

• Burroughs C5205 - added.
• Imperial 99T - added.
• Teal TL-2M - added.

29th April 2003

• Muldivo AE - added.

19th April 2003

• Decimo Vatman V.Sc. II - added.
• Golden Gem adder - added.
• Child's Teaching Speaking Calculator - added.
• Texas Instruments Spirit of '76 - added.

12th April 2003

• Minolta Minolcom - added.

28th March 2003

• Operating a "Comptometer" - added.
• Casio AL-10 - added.
• Sanyo ICC-0081 "Mini Calculator" - added.
• Strand Memory - added.

17th March 2003

• Imperial 91K - added.
• Prinztronic 400 - added.
• Prinztronic 8000 - added.
• Prinztronic Director MC 1000 - added.

8th March 2003

• Calculator Photo library - reorganised and expanded.

25th February 2003

• Announcement of Electrosolids Corp. transistorised desk calculator - added - now removed.
• Philips Prototype Transistorised Electronic Calculators - added.

8th February 2003

• Casio AL-1000 - added.
• Calculator Memory Technologies section - added.

29th January 2003

• Details of memorizer units to convert Sharp Compet 22 to programmable - added.
• Additional information added to The Calculator Business section.

18th January 2003

• Anita calculators moved to the associated site "Bell Punch Company and the Anita Calculators".

14th December 2002

• Rockwell 20R - added.
• Plus Imperial-weight calculator - added.

19th November 2002

• House of Fraser 18F - added.
• House of Fraser 30F - added.

16th November 2002

• Frequently Asked Questions - Section "Estimating the Age of a Calculator" expanded and renamed.

12th November 2002

• Site Search-Engine - added. Note, browser must support javascript. It takes a little time to load the index file, but after that searches are fast. - This version removed 18th. Sept. 2004.
• Desktop Electronic Photographic Library started.
• Royal IC-130 - added.

26th October 2002

• Advance 162P - added.
• Guy's Britannic - added.

15th October 2002

• Busicom Colex 122B - added.
• Plustronic 636 - added.

9th October 2002

• Photographs of Anita 1010 - added.
• The Video Games & Home Computers History Award for October 2002 - added to Home page, and the Video Games and Home Computers site at the Dot Eaters and Number Crunchers Museum added to the links page.

28th September 2002

• Comptometer 993m - added.

16th September 2002

• Ragen Microelectronic Calculator - added.

14th September 2002

• Major update to the Calculator Book addendum.

25th August 2002

• Rockwell/Anita 1211 - added.

12th August 2002

• Operating a Pinwheel Calculator - added to the "Collecting Calculators" section.

10th August 2002

• Prinztronic Micro - added.
• RFT minirex 75 - added.
• Sanyo IC-1122 - added.
• UIT 85X - added.

3rd August 2002

• Sharp PC-1211 (Tandy TRS80 PC-1) pocket computer - added.

20th July 2002

• Bandatronic invoicing system - added.
• Decimo Ltd. - extra information about the company added.

25th June 2002

• Anita: the world's first electronic desktop calculator - A brief history of the complex Bell Punch company and its calculators - article added.
• Busicom of Japan and Broughtons of Bristol - Pioneering calculator company and the company which carries on the name - article added.
• Anita Mk8 - extra photographs added.
• Brunsviga 10 - added.
• Sharp EL-120 - added.

8th June 2002

• Anita Mk8 - extra photographs added.
• IME 26 - added.
• IME 84rc - added.
• Hewlett-Packard HP-65 - added.
• Mullard low-cost electronic calculator - added.
• Rockwell-Anita 811 SL - added.

13th April 2002

• Third Sinclair Cambridge type - added.

1st April 2002

• Section 6) "Collecting Calculators" - transferred to this site.
• Sharp QT-8D - added.

25th February 2002

• Addfeet Junior - added.
• Facit 1111 - added.
• Feet & Inches Addometer - added.
• PLUS 509/T/828599 - added.

26th January 2002

• Atlas-Rand 240 - added.
• Berkey/Omega 100 - added.
• Keystone 88 - added.
• Sinclair The Sporting Life SETTLER - added.
• Book "Antique Office Machines: 600 Years of Calculating Devices" - added to Calculator Resources section.

5th January 2002

• Boots 424 Scientific - added.
• Canon Multi 8 - added.
• Casio AL-8 - added.
• Commodore C108 - added.
• Commodore S61 - added.
• Decimo Vatman Memory - added.
• Decimo Vatman Mini - added.
• Decimo Vatman Mini II - added.
• dsc CAL-0041 - added.
• Geeta 3000 - added.
• Imperial Companion - added.
• Kingson Four-Rule Calculator - added.
• King Sonic - added.
• Kosmos I - added.
• Meir 880 - added.
• Mustang 3000 - added.
• Okhai 8P - added.
• Prinztronic 99P - added.
• Prinztronic Micro 8 - added.
• Prinztronic SC1500M - added.
• Prinztronic X15 - added.
• Radio Shack EC-220 - added.
• RJP 880 - added.
• Rockwell 9TR - added.
• Royal Digital 5-M - added.
• Royal Digital 5-T - added.
• Texas Instruments TI-30 - added.
• Texet 800M - added.

24th September 2001

• Addometer - added.
• Adler Lady - added.
• Sumlock Imperial Weight Calculator - added.
• Calcu-pen - added.
• Elektronika C3-15 - added.
• Elektronika MK57A - added.
• Elektronika MK61 - added.
• Imperial 1010 - added.

31st July 2001

• Casio Mini - replaces the Casio Mini CM-602.

28th July 2001

• Anita 831 - added.
• Imperial 81M - added.
• Imperial 90S - added.
• Imperial Office Master Electric - added.
• Texet 880 Executive - added.
• Texet Scientific 2001 - added.

14th July 2001

• Lloyd's Accumatic 100 - added.

8th July 2001

• Addometer - added.
• Summit Ko9V - added.
• Victor 85 "Tallymate" - added.

23rd June 2001

• Sinclair Cambridge type 2 - added.
• Sumlock Comptometer 993s - added.
• "The Calculator Business" - section started.

16th May 2001

• Casio AS-C - added.
• Olympia CD200 - added.
• Calculator Electronics section expanded.
• Information required on Integrated Circuit Manufacturers added.

1st May 2001

• IME 84 - journal announcement added.

28th April 2001

• Elka 101 - added.
• Rockwell Anita 201 - added.

21st April 2001

• Advance Executive - added.
• Prinztronic MC85 - added.
• Prinztronic P800 - added.
• Ricoh RICOHMAC 1200 - added.
• Sinclair Oxford 150 - added.
• U.S. and GB. patent dates added to Estimating a Calculator's Age.

31st March 2001

• Advance/Wireless World kit calculator - added.
• apf Mark V - added.
• Royal Five GT - added.

26th March 2001

• Imperial 860 - added.

12th March 2001

• Heathkit IC-2009 - added.
• Imperial 1020 - added.
• Imperial Special - added

17th February 2001

• Original Odhner - added.

1st January 2001

• Compuchron calculator watch - added.
• Speech+ - added.
• Calculator Technology pages added.
• Estimating a calculator's age pages added.

28th November 2000

• Anita section - updated.
• Anita 1000 - added.
• Anita 1010 - added.
• Anita 1011P - added.
• Anita 1021 - added.
• Anita 1211P - added.
• Anita 1233D - added.
• Anita 1233P - added.

25th November 2000

• Anita section - updated.
• Anita Mk 9 - added.
• Anita Mk 10 - added.
• Anita Mk 11 - added.
• Anita Mk 12 - added.
• Links to Soviet calculator sites added.

11th November 2000

• IME 84 - added.

28th October 2000

• "British Calculators" section improved.

21st October 2000

• Many small information updates and enhancements.

10th October 2000

• Novus 650 "Mathbox" - added.

26th September 2000

• Anita 1011 - Photographs and information added.

28th August 2000

• Texas Instruments TI 58 & USMC Harrier/AV8-A calculator added.

27th August 2000

• Hitachi KK521 added.
• Otis King Model L added.
• Tamaya NC-77 added.

26th August 2000

• Casio Mini added.
• Olympia CD 81 / Panasonic JE-855U added.
• Sharp EL-825 added.
• Sinclair Executive Memory added.
• Section on Texet starting to be added.

20th August 2000

• Busicom models starting to be added.
• Imperial and Royal models starting to be added.
• Brother PRO-CAL 408 added.
• Unicom 102 added.

9th August 2000

• Curta I added.
• Rapidman 800 added.
• Links to calculator forums added.

5th August 2000

• Hand-held Calculator section added, Mechanical Calculators re-arranged for clarity.

30th July 2000

• Home page and Electronic Desk Calculators re-arranged for clarity.

25th July 2000

• Transfer to new site www.vintagecalculators.com.

19th July 2000

• Memory Devices ESR-817 added.
• House of Fraser 24HF added.
• Prinztronic MC66 added.
• Prinztronic SR88M added.
• Prinztronic XJS added.
• Pye P-630 added.

15th July 2000

• British Calculators page and company details re-arranged for clarity.

8th July 2000

• NCR 18-16 (re-badged Busicom Junior) added. First use of "calculator on a chip".
• More information added to the Sumlock Anita history, and to the Anita model list.
• A history of Broughtons of Bristol and Busicom Business Machines added.

3rd June 2000

• Sinclair Radionic added.
• Links added to Ernie Jorgenson's and Christofer Nöring's sites.
• Correction to the incorrect link from the Home page to the first Sterling currency page which has crept in at some time.

13th May 2000

• Brunsviga Adsum 94T added.
• Imperial Office Master added.
• Plus (Bell Punch/Sumlock) 506/D/815.357 added.
• Sinclair Enterprise added.

29th Apr. 2000

• Pye P-650 added.

8th Apr. 2000

• Sinclair Sovereign added.

26th Mar. 2000

• Anita Mk VII added.
• Index added.
• Calculator Time-line added.

11th Mar. 2000

• Anita 811 added.
• Sinclair Cambridge added.
• Radio Shack EC-4001 added
• Close-up of Sterling Comptometer keyboard added.
• Photograph of Anita Mk VIII added.
• Links page added.
• Many minor changes.

21st Jan. 2000

• Initial posting.

Vintage Calculators

Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.