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Welcome to the Old Calculator Forum for discussion of mechanical and early electronic calculators, especially those of the time of rapid technical development before 1980.

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Generalissimo Rahman, Thomas Kirchhof3

Nov 17

New Resulta B7!

Thanks for the information! I'm excited to try it out! On Friday, November 17, 2023 at 5:48:31 AM

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New Resulta B7!

Thanks for the information! I'm excited to try it out! On Friday, November 17, 2023 at 5:48:31 AM

Nov 17

Dennis Tuckerman, osa...@gmail.com2

Nov 15

TI SR-56 Calculator

Question asked on another forum, replies: “it's likely been damaged by plugging the AC adapter in

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TI SR-56 Calculator

Question asked on another forum, replies: “it's likely been damaged by plugging the AC adapter in

Nov 15

La Greenall, … osa...@gmail.com119

Nov 14

Re: [oldcalculatorforum] Singer 1207 calculator (circa 1975) question

I am applying the voltage to the battery inputs. It's the calculator circuitry. I have a broken

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Re: [oldcalculatorforum] Singer 1207 calculator (circa 1975) question

I am applying the voltage to the battery inputs. It's the calculator circuitry. I have a broken

Nov 14

jefo...@gmail.com, La Greenall3

Oct 30

Compucorp 326 Scientist -- repair info needed

Dear Lawrence, Many sincere thanks for your quick and extensive reply. This is very much appreciated.

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Compucorp 326 Scientist -- repair info needed

Dear Lawrence, Many sincere thanks for your quick and extensive reply. This is very much appreciated.

Oct 30

M. S., … La Greenall7

Oct 4

Friden S10 gears

Hi Lawrence, Thank a lot for the tips and links. Very useful and interesting information indeed! My

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Friden S10 gears

Hi Lawrence, Thank a lot for the tips and links. Very useful and interesting information indeed! My

Oct 4

Sep 26

Sharp PC -1246S - switch from DEG to RAD

I have found it out. It is necessary to type "RADIAN" <ENTER>. :-) Vaclav On Tuesday,

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Sharp PC -1246S - switch from DEG to RAD

I have found it out. It is necessary to type "RADIAN" <ENTER>. :-) Vaclav On Tuesday,

Sep 26

J Hall, … La Greenall10

Sep 24

Singer 1207 pocket calculator question (model circa 1975)

Thanks so much -- all of this is extremely helpful. I have to say, I'm a complete novice

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Singer 1207 pocket calculator question (model circa 1975)

Thanks so much -- all of this is extremely helpful. I have to say, I'm a complete novice

Sep 24

Damien B, John Scriven5

Sep 11

Brunsviga 13 ZK frozen stuck carriage

After a lot of WD-40 spraying, brushing the rails with acetone, and not-gentle-anymore hammering, the

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Brunsviga 13 ZK frozen stuck carriage

After a lot of WD-40 spraying, brushing the rails with acetone, and not-gentle-anymore hammering, the

Sep 11

Sarah Ward, … La Ymir Gryffindor3

Aug 9

Looking to get rid of my dads old HP calculators

Your first step needs to be to research the models. Google them and also search for them on eBay to

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Looking to get rid of my dads old HP calculators

Your first step needs to be to research the models. Google them and also search for them on eBay to

Aug 9

Tanguy, Paulos, Richard G3

Aug 9

Request about a specific calculator switch...

Hi Rick, Thanks for responding so quickly. They do indeed look very similar, but they are different (

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Request about a specific calculator switch...

Hi Rick, Thanks for responding so quickly. They do indeed look very similar, but they are different (

Aug 9

Aug 5

WANTED: Friden RBT (or RSC, RSQ, RSR)

(Photo courtesy of a Twitter user) Hello everyone! I'm a Friden enthusiast, researcher and

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WANTED: Friden RBT (or RSC, RSQ, RSR)

(Photo courtesy of a Twitter user) Hello everyone! I'm a Friden enthusiast, researcher and

Aug 5

artro...@gmail.com, … Laszlo Kery4

Jul 24

Pinwheel Gimme Natalis & Co Braunschweig repair

"move it somehow" does not mean "brute force" for me. Just 1N (one Newton) force

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Pinwheel Gimme Natalis & Co Braunschweig repair

"move it somehow" does not mean "brute force" for me. Just 1N (one Newton) force

Jul 24

Douglas Miller, osa...@gmail.com3

Jul 3

HP-45 looking for a good home

Hi Owen, Did you get my reply to your private message? Maybe check your spam folder. It looks like

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HP-45 looking for a good home

Hi Owen, Did you get my reply to your private message? Maybe check your spam folder. It looks like

Jul 3

James McCosh, Martin VE3OAT6

Jul 2

Hi, James, Were you able to find a power cord for your Anita 1021 calculator? Is it the same as I

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Hi, James, Were you able to find a power cord for your Anita 1021 calculator? Is it the same as I

Jul 2

Christophe Mery, … Arthur Rosen6

Jul 1

mercedes euklid 7 et 8

I don't recall however if I had them, it would have gone with the machine. Did you try Googling

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mercedes euklid 7 et 8

I don't recall however if I had them, it would have gone with the machine. Did you try Googling

Jul 1

Jun 30

Rivendell Cinetron calculator/counter

Does anyone have any information about this device which incorporates a Sinclair Oxford 100

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Rivendell Cinetron calculator/counter

Does anyone have any information about this device which incorporates a Sinclair Oxford 100

Jun 30

Louis Angelucci

May 20

I have a number of TI calculators different models all working. I also have a number of TI-55

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I have a number of TI calculators different models all working. I also have a number of TI-55

May 20

Michael Earnhardt, … calcucris8

May 8

1800s Strange Mystery Device- Possible Early Mechanical Calculator?

Hello Cris! I have posted some additional photos to this thread. You mention how it appears this

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1800s Strange Mystery Device- Possible Early Mechanical Calculator?

Hello Cris! I have posted some additional photos to this thread. You mention how it appears this

May 8

Apr 26

Hexadecimal addiator wanted

I am keen to buy a hex addiator. I believe Hexco and IBM both made one many years ago. Like a normal

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Hexadecimal addiator wanted

I am keen to buy a hex addiator. I believe Hexco and IBM both made one many years ago. Like a normal

Apr 26

Manfred, Friedrich3

Apr 24

Walther Duplex 332

Hello Friedrich Thank you for your information. I have already found these documents. The operation

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Walther Duplex 332

Hello Friedrich Thank you for your information. I have already found these documents. The operation

Apr 24

Dale King, Ed Spittles3

Apr 23

Tiger Accumulator Help

Thank you. Unfortunately, I can't find a mark on either of the gears in the Tiger. On Sunday,

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Tiger Accumulator Help

Thank you. Unfortunately, I can't find a mark on either of the gears in the Tiger. On Sunday,

Apr 23

Darren Lo, machineacalculer3

Mar 25

Wanted: detent springs for a TIM Unitas

For reference, these are the broken parts. The detail shown is the upper rear of the lower carriage

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Wanted: detent springs for a TIM Unitas

For reference, these are the broken parts. The detail shown is the upper rear of the lower carriage

Mar 25

Mar 20

Commodore SR 350 handheld scientific calculator

Does anyone know where I can get more information on this model? Year made, value? Bruce

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Commodore SR 350 handheld scientific calculator

Does anyone know where I can get more information on this model? Year made, value? Bruce

Mar 20

RJC239177, … Matthew Mawson4

Mar 8

Value 1970's Casio desktop calculator

Hi Ryan I managed to pick up one of these machines cheap off Facebook market place mid last year for

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Value 1970's Casio desktop calculator

Hi Ryan I managed to pick up one of these machines cheap off Facebook market place mid last year for

Mar 8

David Ramsey, Mott Rex3

Feb 28

Re: [oldcalculatorforum] Digest for oldcalculatorforum@googlegroups.com - 1 update in 1 topic

Made my own four cell Ni Cad soldered them and reconnected to the board and now works like a charm!

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Re: [oldcalculatorforum] Digest for oldcalculatorforum@googlegroups.com - 1 update in 1 topic

Made my own four cell Ni Cad soldered them and reconnected to the board and now works like a charm!

Feb 28

Had Robinson, … Keith Kennaugh5

Feb 27

Replacement gears

Have you tried 3d printing? You may need resin bath rather than FDM. On Sun, 26 Feb 2023 at 20:36,

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Replacement gears

Have you tried 3d printing? You may need resin bath rather than FDM. On Sun, 26 Feb 2023 at 20:36,

Feb 27

Leonard Butcher, … Mott Rex9

Feb 26

12 digit LED displays required for Commodore calculators

Hi you can't buy new, I unclip bubble and make a boarder/wall and pour in a duplicating gel. Once

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12 digit LED displays required for Commodore calculators

Hi you can't buy new, I unclip bubble and make a boarder/wall and pour in a duplicating gel. Once

Feb 26

Alan Bailey, Timothy R Grainger2

Feb 26

Anyone know about old Texas Instruments Calculators?

http://www.vintagecalculators.com/html/texas_instruments_2500.html#TI2500-2 This has lots of info..

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Anyone know about old Texas Instruments Calculators?

http://www.vintagecalculators.com/html/texas_instruments_2500.html#TI2500-2 This has lots of info..

Feb 26

Timothy R Grainger

Feb 23

Texas datamat II not working

Hi first time poster, as in title my recently acquired datamat TI 2500 isn't firing up. I know

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Texas datamat II not working

Hi first time poster, as in title my recently acquired datamat TI 2500 isn't firing up. I know

Feb 23

mg, … machineacalculer18

Feb 8

Mechanical calculator repair manuals uploaded to archive.org

Bonjour Tu dois pouvoir trouver des informations sur mon site www.machineacalculer.fr Onglet "

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Mechanical calculator repair manuals uploaded to archive.org

Bonjour Tu dois pouvoir trouver des informations sur mon site www.machineacalculer.fr Onglet "

Feb 8

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