1978 Algorithms for RPN Calculators Scarce title. Contains an overview, comparisons, and pictures of the HP-25, HP-35, HP-45, HP-65, HP-67, Novus Mathematician, Novus Scientist, Corvus 500, and other RPN calculators, as well as an introduction to RPN, tips on creating efficient algorithms, and sample programs spanning a wide variety of topics. Also included are hints for porting algorithms between various calculators. Apart from a little cover wear, the book is in very good condition. Hardcover, 344 pages. This item ships WORLDWIDE.

HP-41C SERIES 40 MAGNETIC CARDS RARE VINTAGE CALCULATOR ACCESSORY*40 HP magnetic cards are in unused condition.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP-41 TOP POST REPLACEMENT 2 PIECES 3D PRINTED PAIRS*Fix your HP-41 series calculator broken top posts with this easily installed piece.*The old original plastic posts are brittle and very susceptible to breaking and cracking. These durable 3D posts are far superior than the original HP design.*Broken or cracked posts can cause an intermittent display, loose casing halves or a totally dead unit.*Fits HP- 41C HP-41CV HP-41CX. BIN contains 2 sets to repair 2 units. Only the 2 3D printed pieces are included. All other items pictured are for demonstration only.*Pix #3 The 3D printer piece fits perfectly inside the power module to have a secure fit inside the calculator. When repairing 41 series calculators, Ive notice the module glued in sometimes, not necessary with this upgrade.*Pix #4 shows back with one broken post. You can cut set in half and replace the one, but its better to replace both at once to avoid a future problem.*Pix #5 both posts need to be ground down with a Dremel or drill and sanded smooth.*Pix #6 The 3D piece has a right and left side. Be sure to install correctly, bigger space on bottom. Apply a high quality plastic adhesive and clamp. I prefer J-B weld Plastic bonder. Very strong and ready to reassemble in 30 minutes. Make sure the excess adhesive is removed around post piece to ensure a nice flat surface for the power module installation.*Pix #7 and #8 The installaton is complete. You now have a tight fit for reliable calculator conductivity.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

@@ This listing is for Item #6 @@ The battery in my husband’s Hewlett-Packard HP-41C calculator has corroded, damaging the circuit in the battery bay. As a result, the calculator is not operational. I am offering the following items for sale, which were produced in the years 1979-80, making them 44 years old. All items for sale have not been tested. Please review all the photos to check for any imperfections. The pictures depict the actual item(s) you will receive. When making a purchase, kindly refer to the item numbers provided below and review the photos. Combined shipping is available; the buyer will cover the actual cost of USPS ground shipping. For discounted shipping, please request a final invoice. Thank you!Item #1: HP-41C Application PAC Home Management PAC Module 00041-15023Quick Reference Card 00041-90149Addendum Card 00041-90361Manual Book 00041-90126Overlay: StocksOverlay Finance - BalanceOverlay: BudgetOverlay: TravelHome Management PAC Display BoxItem #2: (SOLD) HP-41C Application PAC Games PAC Module 00041-15022 Manual Book (00041-90125)Overlay: SWAROverlay: PINBALLOverlay: SUBHUNTOverlay: CRAPSGames PAC Display BoxItem #3:HP-41C Application PAC Statistics PAC Module 00041-15001 (Statistic 1)Quick Reference Card (00041-90061)Manual Book (00041-90030)PAC Statistics PAC Display BoxItem #4: (SOLD)Hewlett-Packard Barcode Scanner Wand (HP 82153A)The registration CardItem #5: (SOLD)Standard Module (00041-15001)User guide (00041-90188)Item #6:HP-14C Calculator Quad Memory Module (HP 82170A)Item #7: (SOLD)Owner’s handbook and Programming guide 00041-9001Original HP-14C Calculator Display boxItem #8: (SOLD)HP41C /41CV Operating Manual (00041-90328)Item #9:HP-41C Standard Applications Handbook (00041-90018)Item #10: (SOLD)Two pieces of Standard overlay custom Stickers (00041-90272)Item #11: (SOLD)The HP-41C Calculator Quick Reference Guide (00041-90002)Item #12: (SOLD) HP-41C Calculator battery Pack holder Cover (Type N)Item #13:HP-14C Calculator Module Cover (price is for 1 pc, total 4 pieces available)Item #14: set of rubber feet (Original feet from the Calculator)Item #15:HP-14C Calculator Module Wallet (can hold up to 3 modules and starter GuideItem #16: (SOLD)HP-41C Calculator body for Parts Only (Modules are not included)Item #17:HP 41C Software & Accessories part number list (5955-3096 Rev. 9/80)Item #18: HP-67/HP97 Applications and Accessories List (00097-90041 Rev D 4/77)

PPC ROM WITH MANUAL/POCKET GUIDE*HP-41 PPC ROM and accessories are in excellent condition and work perfectly.*Includes everything shown.*Fits HP- 41C HP-41CV HP-41CX.*Module will be delivered in an antistatic envelope.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

Huge LOT HP-41C Calculator Magnetic Memory Cards, Manuals, Overlays, Booklets, Memory module blank, etc. Includes:5 Memory card booklets mostly filled with preprogrammed cards plus a bag of blank cards... probably over 200 memory cards total.9 calculator overlaysmemory module blank insertvarious quick reference guides, addendum sheets, product lists for the HP-41C and HP-41CV82104A Card Reader Owners ManualPlease carefully view all pictures for condition. Calculator and card reader not included. includes only what is shown in the pictures.

AUTO START AND DUPLICATION MODULE*HP AUTO START AND DUPLICATION module is in excellent condition and works perfectly!*Includes a used HP mini data cassette.*Fits HP- 41C HP-41CV HP-41CX.*Module will be delivered in an antistatic envelope.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP GAMES MODULE 14012 *HP Game module is in excellent condition and works perfectly.*Module will be delivered in an antistatic envelope.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP PLOTTER MODULE *HP PLOTTER module is in excellent condition and works perfectly!*Includes overlay.*Fits HP- 41C HP-41CV HP-41CX.*Module will be delivered in an antistatic envelope.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP TIME MODULE 82182A*HP TIME module is in excellent condition and works perfectly!*Includes Quick Reference Guide.*Fits HP- 41C and HP-41CV.*Module will be delivered in an antistatic envelope.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

BLANKNUT OPTION 001 USER/PRGM KEYS COVERLast one in stock*Original HP Blanknut user/prgm keys cover is in excellent condition and works perfectly.*Calculator shown to properly display the OEM cover and is not included.*This cover piece is almost always missing from this rare calculator.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP-41C HP-41CV Operating Manual User Guide Hewlett Packard Rev B May 1981. Very good condition

Experience the convenience of the Hewlett-Packard Barcode Scanner Wand HP 82153A, a vintage accessory specially designed for the HP-41C, 41CV and 41-CX calculator models. Its compatibility with the said models gives you the opportunity to enjoy a seamless and accurate scanning experience. This wand is made by the trusted brand HP and is perfect for vintage electronics collectors. The wand is not only functional but also visually appealing, with its sleek and durable design that can withstand the test of time. Its ability to scan barcodes with precision allows for quick and easy data entry, making it an essential tool for any professional or personal use. Get your hands on the Hewlett-Packard Barcode Scanner Wand now and take your scanning experience to the next level.

This was obtained at a local estate...It appears to be in good shape but I have no way to test it so I offer it as-is..It may work perfectly..Please see the attached photo(s) and e-mail me with any questions prior to bidding...Winning bidder to add $8.00 for shipping an insurance inside the Continental USA...Payment is expected within 3-days.. PLEASE NOTE....WE SHIP ON TUESDAYS AND FRIDAYS!!!

VINTAGEHEWLETT PACKARDHP-41CCALCULATOR BOX & MANUALS INCLUDES: BOX OPERATING MANUALA GUIDE FOR THE EXPERIENCED USER STANDARD APPLICATIONS MANUAL OWNERS HANDBOOK AND PROGRAMMING GUIDE QUICK REFERENCE GUIDE HP-41C SOFTWARE & ACCESSORIES BROCHURE HP-41C SYSTEM SERVICE CARD CALCULATOR CATALOG AND BUYING GUIDEREQUEST CARD IMPORTANT HP-41C INFORMATION CARD HP-41C OWNERS NEWSLETTER: KEY NOTES CARD USERS LIBRARY SUBSCRIPTION FORM WHAT YOU SEE IS WHAT YOU GET

For sale - HP 41C Calculator in excellent operating and physical condition. This is a rare early edition Tall Key model with very low usage. All keys have excellent Tactile Feedback and the display is crisp with no void segments. The card reader has not been tested however it had little usage. This package includes:HP 41C calculatorCard Reader HP 82104ASoft extended caseManuals: Owners Handbook & Programming Guide, Owners Handbook (HP41CV) Guide, Standard Applications, Math PacNew Duracell batteries (installed August 2023)I have been cleaning out my technology cabinets and found this. I actually forgot I had it as I had sold my HP 41CV kit sometime ago. The reason this unit is so clean and has such low hours is that I purchased it after graduating in 1983 with my engineering degree. When I started a full time (within 3 months) my company presented me with an HP 41CV kit. It has been basically unused since then. Buy with confidence, please check my feedback! Please contact me with any questions.

HP-41 TOP POST REPLACEMENT 2 PIECES 3D PRINTED PAIRS*Fix your HP-41 series calculator broken top posts with this easily installed piece.*The old original plastic posts are brittle and very susceptible to breaking and cracking. These durable 3D posts are far superior than the original HP design.*Broken or cracked posts can cause an intermittent display, loose casing halves or a totally dead unit.*Fits HP- 41C HP-41CV HP-41CX. BIN contains 2 sets to repair 2 units. Only the 2 3D printed pieces are included. All other items pictured are for demonstration only.*Pix #3 The 3D printer piece fits perfectly inside the power module to have a secure fit inside the calculator. When repairing 41 series calculators, Ive notice the module glued in sometimes, not necessary with this upgrade.*Pix #4 shows back with one broken post. You can cut set in half and replace the one, but its better to replace both at once to avoid a future problem.*Pix #5 both posts need to be ground down with a Dremel or drill and sanded smooth.*Pix #6 The 3D piece has a right and left side. Be sure to install correctly, bigger space on bottom. Apply a high quality plastic adhesive and clamp. I prefer J-B weld Plastic bonder. Very strong and ready to reassemble in 30 minutes. Make sure the excess adhesive is removed around post piece to ensure a nice flat surface for the power module installation.*Pix #7 and #8 The installaton is complete. You now have a tight fit for reliable calculator conductivity.*All items from Vintage Calculators Inc come from a smoke free environment.*100% satisfaction guaranteed or prompt refund including original shipping.*Check our feedback comments from our Domestic and International clients.*We combine shipping and have quality items delivered worldwide.

HP-41C/41CV Operating Manual, A Guide For The Experienced User, May 1981.

HP-41C / 41CV Quick Reference Guide, 1/1981 Printing. See photos for condition. Some minor staining.

Welcome to The Narrative Underground, Thank You for visiting our Store! Condition Policy: We take extreme care to honestly state the condition of each item we sell. We follow ebays condition rating system, so please read their description of the condition provided and if you are ever in question about the condition, our photos are always of the item you will be receiving. As a family run business we handle every individual item ourselves, mistakes can and do happen, so please contact us first and we can resolve any issues you may have.Shipping Policy: Shipments go out Monday - Friday, we do not ship on Saturday or Sundays. As long as payment is received early enough it will likely ship out the same business day.Return Policy: We have a 60 Day Seller Return policy, so if you did not think your purchase was all it was supposed to be within 60 Days, please contact us!About Us: The Narrative Underground is a small business ran by a Mother/Daughter team. We are passionate about the written word, growing knowledge and the art of the book itself; artwork, dustjackets, leather-bounds, old age, everything that makes a handheld book special. Littering our eBay Store with Quality, Unique and Valuable items Every Day is our goal. Please peruse our shop and thank you for stopping by!

ENTER: Reverse Polish Notation Made Easy Scarce title. An in-depth guide to the operation and programming of RPN calculators. Overall, the book is in very good condition. Softcover. Copyright 1984. This item ships WORLDWIDE.

ENTER: Reverse Polish Notation Made Easy Scarce title. An in-depth guide to the operation and programming of RPN calculators. Overall, the book is in very good condition. Softcover. Copyright 1984. This item ships WORLDWIDE.

Printer has been refurbished, tested and guaranteed to work. Includes manual, new roll of paper and AC charger. You will need a battery to operate this. I can provide a new battery for an additional $50. Item is listed without battery in case buyer has working batteries. NOTE: if you’re comparing this listing to others, most of these printers will not advance the paper anymore without refurbishment. Please use the pictures as your final determination on condition and not solely rely on my language. I do my best to describe the items I sell as accurately as possible. If you want an additional picture, please ask and I will be happy to add it. Terms of Sale General If you would like to have the shipment delay for whatever reason, please notify me ahead of time. Please read the auction description completely to be certain this item fits your buying needs as this item is offered for final sale. I stand behind the accuracy of my description 100%. Please feel free to ask any questions that might aid you in your buying decision prior to bidding as I consider all sales as final. All of my items are acquired from other parties. I cannot tell if they have been owned by pet owners or smokers. International Buyers Shipping method offered:eBays Global Shipping Program is the default offering. With this program I ship the item to eBays central distribution warehouse and you pay eBay to and deliver it to the final destination. At this time, eBay does not allow items to be combined with this method. If you would like to combine shipping with other items or get a direct shipment quote, please contact me. I will only ship to countries that have delivery confirmation (various methods). Exceptions may be made for low value items. ReturnsI want you to be completely satisfied with your purchase. Please contact me if you have any concerns. Please refer to eBay listing for return policy on item.

ENTER: Reverse Polish Notation Made Easy Scarce title. An in-depth guide to the operation and programming of RPN calculators. Overall, the book is in very good condition. Softcover. Copyright 1984. This item ships WORLDWIDE.