The HP41 Corner

New book from The Calculator Store: HP41 Repair: A Beginner's Guide to Repairing your HP41 Calculator. 14.00€ paperback version, 9.99 Kindle version. Only in Amazon

We have been told that the book is not visible in some of the amazon websites worldwide. Here we offer links to all of them:

amazon.com
amazon.co.uk
amazon.de
amazon.fr
amazon.es
Amazon.it

Kindle and paperback versions available now!

The HP41c calculator, produced from 1979 until 1990, was the standard in engineering and sciences during most of its life. Programmable, alphanumeric, with a high contrast LCD screen, and expandable, it was a true computer in your pocket. Here is our web hommage to it.

Its capabilities could be extended by means of ROM modules with additional functions, and with interfaces it could use printers, plotters, mass storage devices, bar code readers, measurement instruments, etc.

Recently, the user community has developed both new software in ROMs (like the Sandmath family) and hardware: a circuit that substitutes the original and throroughly updates the calculator in terms of speed, memory and functions, including all known modules ever developed (the HP41CL from Monte Dalrymple)

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Zebra + Lower post Product no.: zebra+lowerpost Set of zebra + lower post repair piece 26.00 € * Old price 41.00 € In stock (4) Compare	Assembled HP-41c battery bay and expansion ports module Product no.: Flex-PCB Assembled 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. Black Friday: 20% off 44.00 € * Old price 55.00 € In stock can be shipped within 10 days (43) Compare	New Lower Post Repair part Product no.: Lowpostrepair Piece to repair HP41c full nut series lower screw posts 16.00 € * In stock (11) Compare
New Upper Post Repair part Product no.: UpperPostRepair Piece to repair HP41c series upper screw posts (tested with both fullnut and halfnut versions) 16.00 € * In stock (7) Compare	Assembled HP-41c battery bay and expansion ports module Flat Product no.: Flex-PCB AssembledFlat 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. Black Friday: 20% off 44.00 € * Old price 55.00 € In stock Compare	Battery holder 3D Product no.: Battery holder 3D Battery holder case for the HP41 family of calculators, made with 3D printing and springs in stainless steel 304 alloy 28.00 € * Old price 35.00 € In stock (15) Compare
HP41c battery holder spring Product no.: Spring Stainless steel 304 springs for HP41C battery holder 3.00 € * In stock (11) Compare	Sponge for HP41c standard case Product no.: Esponja Sponge for the standard HP41c vinyl case 2.00 € * In stock (3) Compare	Piece for repair of back case of HP41C Product no.: brokenback 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. 17.00 € * In stock (10) Compare
New HP41c side cover Product no.: Side Cover HP41c side cover. Black Friday: 25% off 6.00 € * Old price 8.00 € In stock (15) Compare	New Repair kit for HP-41c battery bay and expansion ports Product no.: Flex-PCB 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. Black Friday: 25% off 19.50 € * Old price 26.00 € In stock (36) Compare	HP41 overlays Product no.: HP41cOverlay In stock (4) Compare
New Zebra connector for HP41C repair Product no.: Zebra PCB 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. Black Friday: 20% off 12.80 € * Old price 16.00 € In stock (9) Compare	lower post long screw - inox Product no.: lowerscrew Two long screw for the lower screw posts of HP41c calculators 1.00 € / 2 piece(s) * In stock (1) Compare	New Set of 4 screw for HP41 - inox Product no.: Screwset Two long screw for the lower screw posts of HP41c calculators + two long screws for upper posts. 3.00 € / 4 piece(s) * In stock (4) Compare
lower post long screw - black pair Product no.: lowerscrewblack Two long screw for the lower screw posts of HP41c calculators - black 4.00 € / 2 piece(s) * In stock Compare	Spacer set for repairing old HP41c Product no.: SpacerSet Set of 8 pairs of spacers for nut-screwed full-nut HP41c calculators. Substitutes the nuts that are screwed on the lower posts to secure the circuit, 10.00 € * In stock (2) Compare	New HP41c Lower Post Repair Kit Product no.: Lower Post Repair Kit 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 40.00 € * Old price 70.00 € In stock (4) Compare
New HP41c Port cover - 3D Product no.: Port cover 3D HP41c back port cover - 3D, new - set of 4. Black Friday: 20% off 19.20 € / 4 piece(s) * Old price 24.00 € In stock (3) Compare	Repaired HP41c back side Product no.: HP41Cback Repaired back side of HP41c. It can be used in case the original backside has the screw supports broken. 40.00 € * (1) Compare	4 x Piece for repair of back case of HP41C Product no.: brokenback4 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. 50.00 € * Old price 72.00 € In stock (2) Compare
Thermal Paper for HP Printer - single roll Product no.: HP-82175 Thermal Paper for HP calculator printers: (HP 82240a & b, HP-92 & HP-97, 82143a & HP-IL printer) single roll 5.00 € * In stock (2) Compare	Memory module for HP41c - USED Product no.: HP Memory Memory for HP41c calculators (64 registers) 15.00 € * Compare	Quad Memory module for HP41c - USED Product no.: HP Quad Memory Quad Memory for HP41c calculators (256 registers) 30.00 € * Compare
Full-nut processor Full-nut processor - please select C or CV type, or installation in your machine 15.00 € * In stock (5) Compare	Keyboard support for repairs Product no.: keyboard support Piece required for the lower post repair of HP41c calculators. 25.00 € * In stock (1) Compare	Navigation Pac for HP41c - USED Product no.: HP Navigation Pac Navigation Pac for HP41c calculators 60.00 € * Compare
Math Module Product no.: MathPac Math Module for HP41c 40.00 € * In stock Compare	Financial Pac for HP41c - USED Product no.: HP Financial Pac Financial Pac for HP41c calculators 45.00 € * Compare	Stat 1 module Product no.: Stat 45.00 € * In stock Compare
Stat Module Product no.: Stat module Stat Module 45.00 € * In stock Compare	Feet for HP41c HP41cv HP41cx calculators - set of 4 Product no.: feet41c Adhesive black silicone feet for HP41c HP41cv HP41cx calculators 4.00 € / 4 piece(s) * In stock (12) Compare	10nF capacitor Product no.: 10nFcap 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 0.75 € * In stock Compare
Card reader repair Product no.: card reader repair Card reader repair 60.00 € * (3) Compare	Surveying I module - USED Product no.: Surveying module USED HP Surveying module - tested with manual 40.00 € * In stock (1) Compare	Machine Design Module Product no.: Machine Design Machine design Pac for HP41c calculators 60.00 € * Compare
Home Management Module Product no.: Home management Home Management Pac for HP41c calculators 50.00 € * In stock Compare	Real Estate Module Product no.: Real Estate Module Real Estate Module for HP41c calculators 50.00 € * In stock Compare	Standard Pac para HP41c/cv/cx - USED Product no.: Standard Pac2 Standard pac with manual 50.00 € * Old price 70.00 € Compare
Card reader side-locks Product no.: cardreader sidelocks 3D printed HP82104A card reader side-locks - set of left and right locks 25.00 € / 2 piece(s) * In stock (1) Compare	Games Module Product no.: Games Module Games Module for HP41c calculators 50.00 € * Compare