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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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May 11

Free Mechanical Calculators - you pick up in Bay Area

Hi gang, I have about a dozen mechanical calculators -- 5 Fridens (STW and related electric machines)

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Free Mechanical Calculators - you pick up in Bay Area

Hi gang, I have about a dozen mechanical calculators -- 5 Fridens (STW and related electric machines)

May 11

artro...@gmail.com, Nigel T2

May 11

Rapid Calculator

I am not very familiar with Rapid Calculators, however, here are a few sources of information that

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Rapid Calculator

I am not very familiar with Rapid Calculators, however, here are a few sources of information that

May 11

jefo...@gmail.com, … men...@gmail.com6

May 11

Compucorp 326 Scientist -- repair info needed

Hi, As you have found, there is a service manual available with quite a lot of information. These

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Compucorp 326 Scientist -- repair info needed

Hi, As you have found, there is a service manual available with quite a lot of information. These

May 11

Simon Crouch, … Bruce Flamm7

May 10

Lots of Anita Calculators

Hello Simon I've been trying to reach you with my AOL account but have not been successful so I

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Lots of Anita Calculators

Hello Simon I've been trying to reach you with my AOL account but have not been successful so I

May 10

DandyDon “Xerox6085”

Apr 13

Manuals For Compucorp 485/LItton-Monroe 1830

Does anyone have scanned or otherwise user, programming or service documentation for the Compucorp

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Manuals For Compucorp 485/LItton-Monroe 1830

Does anyone have scanned or otherwise user, programming or service documentation for the Compucorp

Apr 13

Fuad Hirmas, … Nigel T4

Apr 12

Old Rema Model 1 Calculator

Dear Bart, thank you so much for your help. I will check all of them and try to learn as much as I

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Old Rema Model 1 Calculator

Dear Bart, thank you so much for your help. I will check all of them and try to learn as much as I

Apr 12

Paul W uk, … Pieter La Grange4

Apr 10

Schematics or service manuals needed

Hi Paul Do you still have your Facit 1125? I acquired one in 2022 and it also needs repairs. I also

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Schematics or service manuals needed

Hi Paul Do you still have your Facit 1125? I acquired one in 2022 and it also needs repairs. I also

Apr 10

Gabriel Baum, … osa...@gmail.com4

Apr 6

How big is your collection? I'm always open to donations :-) On Friday 5 April 2024 at 12:58:40

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How big is your collection? I'm always open to donations :-) On Friday 5 April 2024 at 12:58:40

Apr 6

Gabriel Baum, … Arthur Rosen4

Apr 5

Michael, I am not a collector of rare/vintage calculators. Instead, I was a collector of antique

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Michael, I am not a collector of rare/vintage calculators. Instead, I was a collector of antique

Apr 5

Mar 18

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

Standard AA nickel-cadmium batteries. Modern LiIon would probably work but why take the chance? On

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

Standard AA nickel-cadmium batteries. Modern LiIon would probably work but why take the chance? On

Mar 18

Mar 17

TI SR-10 battery

Hi, I've just purchased a very nice SR-10 like the one I bought in high school. :) The seller

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TI SR-10 battery

Hi, I've just purchased a very nice SR-10 like the one I bought in high school. :) The seller

Mar 17

Thomas Plummer, osa...@gmail.com20

Feb 28

Original TI30 circa 1977 key bounce problem

Well done. You have good observation and troubleshooting skill. Thomas C Plummer Whaling and

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Original TI30 circa 1977 key bounce problem

Well done. You have good observation and troubleshooting skill. Thomas C Plummer Whaling and

Feb 28

Louis Angelucci

Feb 22

ti vintage calculators

I have been a collector of vintage calculators for some time. It has been a fascination of mine to

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ti vintage calculators

I have been a collector of vintage calculators for some time. It has been a fascination of mine to

Feb 22

René Henry, machine a calculer5

Feb 18

do you have informations about this appliance : GAB-KA by Zephyr C° ?

Merci pour le tuyau et mes salutation à madame :-) Le dim. 18 févr. 2024 à 18:45, 'machine a

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do you have informations about this appliance : GAB-KA by Zephyr C° ?

Merci pour le tuyau et mes salutation à madame :-) Le dim. 18 févr. 2024 à 18:45, 'machine a

Feb 18

Jan 26

TI-30X Pro MultiView: white inlet card available ?

Hello, is there anyone who can sell me this "short cuts" card that is placed in the back

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TI-30X Pro MultiView: white inlet card available ?

Hello, is there anyone who can sell me this "short cuts" card that is placed in the back

Jan 26

Don Miffitt, … hossnerbiz6

Jan 16

Has anyone seen this Bowmar calculator before. I cannot find on the web about it. It may be a prototype that never went into production. There are no labels on the back.

Hi Steve, That makes sense. Thanks for your help. Best Regards, Don On Tue, Jan 16, 2024 at 1:15 PM

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Has anyone seen this Bowmar calculator before. I cannot find on the web about it. It may be a prototype that never went into production. There are no labels on the back.

Hi Steve, That makes sense. Thanks for your help. Best Regards, Don On Tue, Jan 16, 2024 at 1:15 PM

Jan 16

Mike Kauzlarich, hossnerbiz2

Jan 7

Haverhill Multator 4, NIB needs a home

Mike - I'm interested and I sent you an email. Thanks! Steve

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Haverhill Multator 4, NIB needs a home

Mike - I'm interested and I sent you an email. Thanks! Steve

Jan 7

Jan 7

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

I'd be interested in this machine, but email sent to “the...@comcast.com” bounces with a “User

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

I'd be interested in this machine, but email sent to “the...@comcast.com” bounces with a “User

Jan 7

christophe mery

12/18/23

HP33s et 2 HP35

Bonjour L'un d'entre vous serait-il intéressé par l'une de ces deux machines Merci

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HP33s et 2 HP35

Bonjour L'un d'entre vous serait-il intéressé par l'une de ces deux machines Merci

12/18/23

Generalissimo Rahman, Thomas Kirchhof3

11/17/23

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

11/17/23

Dennis Tuckerman, osa...@gmail.com2

11/15/23

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

11/15/23

La Greenall, … osa...@gmail.com119

11/14/23

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

11/14/23

M. S., … La Greenall7

10/4/23

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

10/4/23

9/26/23

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,

9/26/23

J Hall, … La Greenall10

9/24/23

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

9/24/23

Damien B, John Scriven5

9/11/23

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

9/11/23

Sarah Ward, … La Ymir Gryffindor3

8/9/23

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

8/9/23

Tanguy, Paulos, Richard G3

8/9/23

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 (

8/9/23

8/5/23

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

8/5/23

artro...@gmail.com, … Laszlo Kery4

7/24/23

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

7/24/23

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