TheCalculatorStore

The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities. Later came the HP-41CV, with 4 times the memory space.

Time module for HP 41c/vc calcs. 

HP50g black used in very good shape.

HP50g Blue used in very good shape, including CD with manual and case

Assembled module for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price for EU customers.

New price: cheaper circuit translating to 10% lower price!

Get professional performance from the ultimate RPN scientific programmable calculator. Switch between RPN1 and algebraic entry-system logic at any time. The HP 35s features a two-line display, and the powerful HP Solve2 application.

Ideal for real estate, finance and business professionals, the HP 17bII+ features a simple keyboard, 250 menu-driven functions, RPN1 and algebraic entry-system logic. Its intelligent menu system allows you to concentrate on the problem, not on the calculator. 

After more than 20 years and 3 versions with different processors, its unsurpassed function set and user friendliness keeps the HP17bII in the to echelon of financial calculators.

Get the answers you need quickly with the easy-to-learn and use HP10bll+ Financial Calculator. Whether you are a student or a practicing professional, the HP 10bll+ makes it easy to solve business, financial, statistical, and math calculations accurately and quickly, at a price that everyone can afford. The design packs plenty of features to make your work less complicated.

Original HP17bII calculator. Excellent state. Original cover, box and manual. Works with both Algebraic and RPN

sold out

HP41CL with the latest version of Systemyde circuit

New version HP-PRIME G2/B1S (2AP18AA) !!  

HP Prime is the first color touch screens in the industry that today’s gadget savvy students can easily interact with.  

We are currently shipping this model all around Europe. This version is approximately twice as fast than the previous version

Two long screw for the lower screw posts of HP41c calculators + two long screws for upper posts.

Two long screw for the lower screw posts of HP41c calculators

Two long screw for the lower screw posts of HP41c calculators - black

Battery holder case for the Woodstock family of calculators, made with 3D printing and springs in stainless steel 304 alloy

Adhesive black silicone feet for HP41c HP41cv HP41cx calculators

Battery holder case for the HP41 family of calculators, made with 3D printing and springs in stainless steel 304 alloy

HP41c back port cover - 3D, new - set of 4.

HP41c side cover.

More powerful and capable than ever, the HP 12c Platinum is up to 6 times faster with 4 times more memory than the original HP 12c. (the current HP 12c in this shop is a new model based in the ARM processor which is 25 times faster than the HP 12c Platinum) However, it takes up to 399 program lines, compared with just 99 of the plain 12c model.

Choose between RPN1 or algebraic entry-system logic, handle up to 80 cash flows and utilize over 130 built-in functions.

Now shipping!!

The newest calculator in the HP graphical stable. Programmed from scratch in native ARM code, and with a 127 x 256 pixels screen with gray levels, it is much faster than previous HP calculators and also than the competition. The solid feel makes it an ideal calculator for school, in particular for those countries that do not allow CAS devices in class.

Piece to repair HP41c series upper screw posts (tested with both fullnut and halfnut versions)

Set of pieces needed to repair successfully the lower posts of HP41C, 41CV and 41CX full nut calculators, including zebra connectors, lower post part, and keyboard support for clothes' pegs to protect the keyboard

1 Piece for repairing HP41c back cases.

This piece is for repair of HP41c back halves, specifically the support of the upper screw heads that is often damaged, and very difficult to repair in a lasting way.

LR44 battery for calculators of Voyager series (HP10c, HP11c, HP12c old, HP15c and HP16c) and Pioneer series (HP10b, HP17bII, HP42s, HP27s)

Zebra Holder to keep the elastomeric zebra connectors in the contacts between main board and processor circuit in the HP41c calculator family, full nut versions.

Piece to repair HP41c full nut series lower screw posts

HP41c back port cover - original and used.

Adhesive circuit for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price.

Repaired back side of HP41c. It can be used in case the original backside has the screw supports broken.

4 pieces for repairing HP41c back cases.

This piece is for repair of HP41c back halves, specifically the support of the upper screw heads that is often damaged, and very difficult to repair in a lasting way.

We offer the flashing of new firmware for the 10bII+, 12c+, 20b and 30b.

These calculators have a port that allows the user to flash a new firmware. For that, a special cable is needed.

Pioneer series battery cover: HP10b, HP14b, HP17bII, HP42s, HP27s,HP22s, HP32sII

This piece is for repair of HP41c full nut calculator, substituting the damaged or corroded zebra connector that links the main board with the processor circuit. New design.

10nF Capacitor to solder close to the screen of HP41c units before serial number 1954A to be able to use different processors (including the CL circuit by Monte Dalrymple) - 50v

Assembled module for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price for EU customers.

This is the FLAT version, when the screw head domes are broken and grinded down - see pictures.

New price: cheaper circuit translating to 10% lower price!