Calculator Culture
Calculator Culture
  • 80
  • 962 141
SwissMicros DM32 Review
This is a review of the SwissMicros DM32, a modern RPN scientific calculator based on the HP-32SII.
The DM32 can be purchased from SwissMicro's site www.swissmicros.com/product/model-dm32
Sections of this video:
00:00 - Intro
02:29 - Hardware
05:25 - Internals
07:18 - Basic Usage
10:21 - Bases, Fractions and Complex Numbers
13:43 - Multi-state
15:18 - Equations
17:01 - Programming
18:07 - Pricing
19:37 - Summary
For more calculator videos check out my channel czcams.com/users/CalculatorCulture
zhlédnutí: 18 881

Video

C47 Calculator Review
zhlédnutí 6KPřed 28 dny
This is a review of C47, a community-developed RPN calculator that runs on the SwissMicros DM42 hardware platform. The website for the C47 project is located at 47calc.com Sections of this video: 0:00 - Intro 1:34 - Project History 3:14 - User Interface 5:16 - Basic Usage 6:26 - Data Types 12:57 - Equations, Statistics and Modelling 17:10 - Programming 18:03 - Customisation and Load/Save State ...
HP 48GX Graphing Calculator from 1993
zhlédnutí 6KPřed 3 měsíci
This video is about the much beloved HP 48GX graphing calculator from 1993. Sections of this video: 0:00 - Intro 2:22 - Hardware 6:19 - User Interface 8:30 - Advanced Functions 12:37 - Speed and Extensions 13:41 - Summary Retrotronik make RAM cards for the 48 series available here retrotronik.com/products/ For more calculator videos, check out my channel czcams.com/users/CalculatorCulture
Casio CM-100 Computer Math Calculator from 1986
zhlédnutí 1,5KPřed 5 měsíci
This video is about the Casio CM-100 programmer's calculator from 1986. Sections of this video: 0:00 - Intro 2:02 - Physical Hardware 3:19 - Internals 3:33 - Comp Mode 4:29 - Base Modes 8:15 - Summary For more calculator videos, check out my channel czcams.com/users/CalculatorCulture
PX-15C, PX-16C & PX-41C Calculator Kits Review
zhlédnutí 3,7KPřed 6 měsíci
This video is about the PX series of calculator emulators. The PX devices come as build-your-own kits, or pre-built, and emulate classic HP calculators, such as the Voyager series and 41C. In this video, I talk about the PX-15C and PX-41C, and the experience of putting together the PX-16C from a component kit. For more information about the project, check out: - Project Homepage - paxer.net/voy...
Sharp EL-9000 Graphing Calculator from 1986
zhlédnutí 2,2KPřed 7 měsíci
This video is about Sharp's first graphing calculator, the EL-9000 (EL-5200), that supported the AER programming language. Sections of this video: 0:00 - Intro 2:23 - Physical Design 5:24 - Internals 5:53 - Basic Usage 8:03 - Graphing 9:26 - Programming 13:06 - Summary For more calculator videos, check out my channel czcams.com/users/CalculatorCulture
HP 15C Collector's Edition Review
zhlédnutí 14KPřed 9 měsíci
This video is a review of the HP 15C Collector's Edition, a 2023 reissue of the classic HP 15C RPN scientific calculator. Sections of this video: 0:00 - Intro 1:50 - Unboxing 3:21 - Physical Design 6:25 - Performance Comparison 8:30 - Memory Comparison 10:19 - Test Menu and Hidden Modes 11:16 - 15.2 Mode 12:17 - 16C Mode 13:29 - Summary You can check out the 15C Collector's Edition Owner's Hand...
HP 48SX Calculator from 1990
zhlédnutí 8KPřed 10 měsíci
This video is about the innovative HP 48SX graphing calculator from 1990. The SX pioneered some new features such as textbook-like equation editing, a matrix editor and deep support for units. Sections of this video: 0:00 - Intro 2:27 - Physical Design 7:26 - Internals 9:31 - Basic Usage 13:25 - New features 19:55 - Programming 23:10 - Summary In the video, I mention a few links that I would ad...
Casio fx-702p from 1981 - Casio's first pocket computer
zhlédnutí 5KPřed rokem
This video is about the Casio fx-702p pocket computer from 1981, Casio's first pocket computer. Sections of this video: 0:00 - Intro 0:56 - Physical Design 2:16 - Internals 3:06 - Basic Usage 4:17 - Programming 6:11- Summary For more calculator videos check out my channel czcams.com/users/CalculatorCulture
TI-58C Scientific Calculator from 1978
zhlédnutí 4,6KPřed rokem
This video is about the TI-58C scientific calculator from 1978, which was part of the 58/59 series. Sections of this video: 0:00 - Intro 2:57 - Physical Design 4:41 - Internals 5:56 - Basic Usage 8:13 - Master Library Module 10:09 - Programming 12:45 - Undocumented HIR Instructions 15:38 - Summary For more calculator videos check out my channel czcams.com/users/CalculatorCulture
Casio fx-991CW Scientific Calculator Review
zhlédnutí 92KPřed rokem
➡️ Get a Casio fx-991CW: is.gd/haxe68 This video is a review of the Casio fx-991CW Scientific calculator, a design update of the popular fx-991EX. Sections of this video: 0:00 - Intro 1:06 - Physical Design 3:16 - Apps and Menu Navigation 5:47 - Format Key 7:45 - Variables and Functions keys 8:59 - Summary For more calculator videos check out my channel czcams.com/users/CalculatorCulture
Casio fx-61F - The best calculator ever made for electronics engineers?
zhlédnutí 8KPřed rokem
➡️ Get a Casio fx-991CW: is.gd/haxe68 This video is about the Casio fx-61F, a unique calculator from 1988 that was designed specifically for electronics and electrical engineers. Sections of this video: 0:00 - Intro 1:26 - Physical Design 5:05 - Internals 5:35 - Complex Calculations 7:40 - Impedance Calculations 12:43 - Impendence Functions for the 42S 14:36 - Formula Library 15:19 - Programmin...
Casio fx-201p Programmable Calculator from 1976
zhlédnutí 4,2KPřed rokem
➡️ Get a Casio fx-991CW: is.gd/haxe68 This video is about the Casio fx-201p, the first Casio programmable calculator available outside of Japan. The version of the N-Queens solution I ran is here: community.casiocalc.org/topic/3902-the-n-queens-problem-on-a-casio-fx-201p-8-queens/ Sections of this video: 0:00 - Intro 1:33 - Physical Design 3:26 - Internals 4:09 - Basic Usage 7:08 - Programming ...
HP 21S Stat/Math Calculator from 1989
zhlédnutí 2,2KPřed rokem
This video is about the HP 21S, a niche statistics and maths calculator from HP's Pioneer series. Sections of this video: 0:00 - Intro 1:22 - Physical Design 3:21 - Basic Usage 4:46 - Probability Distribution Functions 8:23 - Statistics and Welford's Method 10:27 - Built-in Library 11:30 - Summary For those that are interested in knowing more about how to disassemble an HP 20S or HP 21S check o...
HP 46 Desktop Calculator from 1973
zhlédnutí 2,2KPřed rokem
This video is about the HP 46, the desktop companion to the HP 45 pocket calculator. Sections of this video: 0:00 - Intro 1:44 - Physical Design 4:53 - Basic Usage Printer 7:18 - Scientific and Stats Operations 9:14 - Summary For more calculator videos check out my channel czcams.com/users/CalculatorCulture
Sharp EL-5150 Scientific Calculator from 1985
zhlédnutí 2,9KPřed rokem
Sharp EL-5150 Scientific Calculator from 1985
Casio fx-603P Scientific Calculator from 1990
zhlédnutí 4,2KPřed rokem
Casio fx-603P Scientific Calculator from 1990
TI Galaxy 67 Scientific Calculator from 1992
zhlédnutí 3,1KPřed rokem
TI Galaxy 67 Scientific Calculator from 1992
HP 71B - FORTH/Assembler ROM from 1984
zhlédnutí 5KPřed rokem
HP 71B - FORTH/Assembler ROM from 1984
Casio fx-4500P Scientific Calculator from 1989
zhlédnutí 9KPřed rokem
Casio fx-4500P Scientific Calculator from 1989
TI-74 Basicalc Pocket Computer from 1985
zhlédnutí 4,6KPřed rokem
TI-74 Basicalc Pocket Computer from 1985
HP 17BII / 17BII+ Financial Calculator versions - Which is best?
zhlédnutí 7KPřed 2 lety
HP 17BII / 17BII Financial Calculator versions - Which is best?
HP 71B Pocket Computer from 1984
zhlédnutí 9KPřed 2 lety
HP 71B Pocket Computer from 1984
Plus42 Review - An Enhanced HP-42S Calculator Simulator
zhlédnutí 19KPřed 2 lety
Plus42 Review - An Enhanced HP-42S Calculator Simulator
Casio ClassPad II Review
zhlédnutí 24KPřed 2 lety
Casio ClassPad II Review
HP 42S Scientific Calculator from 1988
zhlédnutí 10KPřed 2 lety
HP 42S Scientific Calculator from 1988
Google's ingenious variable-precision Calculator app
zhlédnutí 9KPřed 2 lety
Google's ingenious variable-precision Calculator app
TI-66 Programmable from 1983
zhlédnutí 6KPřed 2 lety
TI-66 Programmable from 1983
Sinclair Cambridge Programmable from 1975
zhlédnutí 3,5KPřed 2 lety
Sinclair Cambridge Programmable from 1975
Casio Z-1GR 16-Bit Pocket Computer from 1997
zhlédnutí 9KPřed 2 lety
Casio Z-1GR 16-Bit Pocket Computer from 1997

Komentáře

  • @7alken
    @7alken Před 15 hodinami

    quite nice beast still;

  • @justamar
    @justamar Před dnem

    man i didnt even know i liked calculators like that.

  • @peshealy
    @peshealy Před 2 dny

    I began my career in the early 80's doing IBM assembly language programming. I also worked on a Z80 based check repair machine. I bought a CM-100 when they first came out. I used mine pretty extensively until I moved to higher level languages later on. It still works fine even thought the case cracked long ago and was epoxied.

  • @javaman4584
    @javaman4584 Před 2 dny

    Someone in the comments mentioned the idea of changing the keys. That may be possible, but it may not be necessary. Look at the functions on the keys themselves, ignoring the yellow and blue shifted functions. These are basic functions we would find on most HP calculators. Perhaps if the community could agree on a standard set of keys, that device could become a generic platform for all of the various projects being developed. Swiss Micro could sell the calculator with the basic key set and operating system but without a faceplate or software. The projects would have to provide their custom faceplate, ROM image, and optionally a bezel. Right now the DM42 is being used as a base platform for these projects, but IMO having two shift keys like the DM32 has is a better format. I understand it may be difficult for existing projects to convert their software to run on the new CPU, so it may be some time before any of this could happen.

  • @damianlynch5977
    @damianlynch5977 Před 3 dny

    If you know of any surveying programs for the 42, could you let me know.

  • @david43485
    @david43485 Před 3 dny

    I have a question. Could you help me, please? There is a programm which is wrote on a paper inside your video. My question is about a character in this programm. What is the touch on the fx4000P, to write the fourth caracter at the third line. This is the caracter just before "Goto 4" that I'm searching. I think that it is the touch which is the first column on the left on the fx4000p, and at the fifth line. Is it right, please?

  • @betaorionis2164
    @betaorionis2164 Před 3 dny

    I got mine. The touch of the keys is cheap-ish and nothing comparable to the original. I guess the software is better, but is this really the point?

  • @prakashhirawat5825
    @prakashhirawat5825 Před 4 dny

    i have classwiz cw calculator most useless not worth so difficult to use and not useful in numerical analysis so i hate it if anyone want i will sell it

  • @sepgorut2492
    @sepgorut2492 Před 4 dny

    I had one of those back in the day. I never had any problems with the hardware but never learnt of the HIR functions.

  • @D_shadow-ow6pb
    @D_shadow-ow6pb Před 5 dny

    How to type raise to power

  • @franz2383
    @franz2383 Před 5 dny

    Great video! Do one for the CASIO FX-5200 please.

    • @CalculatorCulture
      @CalculatorCulture Před 5 dny

      They are tricky to find in working condition, but I’ll keep my eye out.

  • @eshelectronic
    @eshelectronic Před 7 dny

    Hello. Can anyone help me with a diagram of the power supply, on an Underwood 280, which should be the same as the Olivetti Divisumma 28. I have collected quite a few old calculators as I have been repairing them since 1973. I would be very happy, if anyone can post a link. I have also sold many Olivetti calculators and typewriters Vh Erik Hansen, Denmark.

  • @setharnold9764
    @setharnold9764 Před 8 dny

    My God this is beautiful. My first HP was an hp48, I never really got into the forerunners, but they were clearly amazing machines built with love. And this is just an amazing homage. The hp48, especially with the metakernel system, would be one heck of an undertaking, but I'd probably have to buy one immediately.

  • @remainsmemories626
    @remainsmemories626 Před 8 dny

    By the looks of it: those are not e-ink, but Sharp memory LCD displays

  • @MrFish1968
    @MrFish1968 Před 8 dny

    Wow, 220 quid for a calculator!

  • @Cornel1001
    @Cornel1001 Před 8 dny

    I have fx19 , and is confusing in some points. Fx39 beeing the way !

  • @tuppyglossop222
    @tuppyglossop222 Před 9 dny

    I still use my HP32 on most days. I got it to replace my student HP33E sometime in the mid 90s. And I managed to get my employer to pay for it! I must say that I never really used it to the fullest as I did all of my heavy calculations using spreadsheets. I’m retired now, so there is no way I could justify buying one of these, but I would if I could…

  • @arxaaron
    @arxaaron Před 9 dny

    Great to find this channel and SwissMicros. Nice to see HP RPN living on. Great geek tech never dies, it just gets Re-tro-vitalized! 🙂

  • @keithrezendes6913
    @keithrezendes6913 Před 9 dny

    Had the HP 16c

  • @weekenddistractions

    This is great! The 32sii was my favorite calculator. I had two of them. The dog destroyed one of them, and I had several keys eventually stop working on the other. I'm definitely going to check this out

  • @CZpersi
    @CZpersi Před 9 dny

    I wonder, why not use e-ink screen in such calculators?

  • @docsnider8926
    @docsnider8926 Před 9 dny

    I do my calculations with a hp11c since decades. But this looks promising, maybe i switch?

  • @arysouza729
    @arysouza729 Před 9 dny

    bom dia, estacalculadora está a venda/ quantocusta?

  • @abdullah27743
    @abdullah27743 Před 9 dny

    But present time 991 ex original calculator has become very rare to find.

  • @arturovillalpando289
    @arturovillalpando289 Před 10 dny

    Hi everyone, I’ve just got a CASIO 7000G calculator in mint condition from eBay with original box, the two manuals, soft carry bag and the Calc itself with fresh bats for $29 dollars. Long time sought after by me in that precise condition.

  • @davidswantek2295
    @davidswantek2295 Před 10 dny

    I love my old HP48GX that I bought while in engineering school, so now I have Droid48 running on my Phone and it is free. Sorry no sale.

  • @LazerDon271
    @LazerDon271 Před 10 dny

    Can it play Doom? Otherwise I'm not interested.

  • @iAPX432
    @iAPX432 Před 10 dny

    Swiss Micros should be proposing an hardware upgraded version of it's base: rechargeable battery (through USB-C), better screen (larger, color, etc.), more internal storage, ... And then add "personalities" through keyboard bezels and firmware, to be able to go from a 41CX to a 67 or anything else under the sun with the same format. Maybe be able to have different personalities loaded, and be able to switch, each one with its own dataset.

    • @gmaxwell
      @gmaxwell Před 4 dny

      The particular (memory lcd) screen is a big part of why the dm42 is a great device.

  • @auronthas
    @auronthas Před 11 dny

    Thanks for the review. Just wonder why the log and 10^x not the same key like other standard HP calculators?

  • @christopherguy1217
    @christopherguy1217 Před 11 dny

    I love the 15C. I bought the 15C Limited Edition and that thing bricked itself. My old 15C still works.

  • @gettheflockoutofhere
    @gettheflockoutofhere Před 12 dny

    My guess is you would still recommend the DM42, given it is more capable and can become a C47, or maybe not. The states are interesting and more functionality is immediately accessible. Thoughts?

  • @dscott1524
    @dscott1524 Před 12 dny

    The problem with RPN calculators, and the main reason I switched to a TI-89 years ago, is the lack of calculation history. The calculator displays the result but forgets how it got there. You can't go back and revisit your calculation "That doesn't make sense, What did I put in?" To deal with this in an inexpensive package, I recommend the Sharp EL W516. I bought a HP35 back in 1972, It was wonderful and I continued with the HP65. 67, and the HP41. I loved my RPNers but now RPN is obsolete, I had to move on. I can't recommend this DM32. Time to move on. Sigh. Cheers.

    • @CalculatorCulture
      @CalculatorCulture Před 12 dny

      You are probably not going to like the rest of my channel 🤣

  • @pmue437
    @pmue437 Před 12 dny

    12C is a Companion for 20+ years. I like Sales calculation and Depreciation which is very quick.

  • @RobertoCarlos-tn1iq
    @RobertoCarlos-tn1iq Před 13 dny

    can you check what answer you get for the cube root of -8?

  • @mokopa
    @mokopa Před 13 dny

    20:20 Yes, I can't agree more! The 35s was a missed opportunity and thankfully Swiss Micros was there to pick up that dropped ball, and run with it

  • @PabloArduz
    @PabloArduz Před 13 dny

    250€ for nothing more than a mid-rsnge cientific calc???.....there are power for more, the OG HP33s is a better option than a good construction option

  • @rideon41
    @rideon41 Před 13 dny

    Thanks for the video, great as always! Excited for the C47 as it is developed further. It has great potential, but I have to say, right now the general display update speed needs to be worked on. This is running on DM42, it should be much faster, and it detracts from the experience. Definitely looking forward to your video on DB48X!

  • @user-yk1cw8im4h
    @user-yk1cw8im4h Před 13 dny

    That pcb is like one from a hobbyist project

    • @CalculatorCulture
      @CalculatorCulture Před 13 dny

      Someone told me there are boutique synth makers who also do artwork on their pcbs.

  • @theedspage
    @theedspage Před 14 dny

    My favorite features of the DM32 are the state files and the four line display.

  • @samuelarduino
    @samuelarduino Před 14 dny

    TOPNOTCH QUALITY! RPN should be the standard( put in the numbers first and then tell the C what to do with them) in schools, better understanding and a 30% timesaver on keystrokes / please do not say this is the last of the great calculators i guess this can very well be a new trend. maybe the company should make some apps available for kids so to play with numbers and get the idea.......

  • @ultrametric9317
    @ultrametric9317 Před 14 dny

    Can you turn off the silly picture?

    • @CalculatorCulture
      @CalculatorCulture Před 14 dny

      Yes there is a configurable folder of images the DM32 cycles through when it is turned off.

  • @alexandredeoliveirapenna198

    Hp32s is my calculator since 1987 when i start my electronic technician course, and and after that on my electrical engineering, with exception of 2 disciplines that i loan an hp48. Im glad that swissmicro make the evolution of this calculator, for me it is the best calculator hp made. Of course the dm32 batteries will not stand for years as hp32, but i see that rechargeable battery is a good replacement for that feature. Overall the new DM32 is the best calculator if you use the hp32 and always struggled on putting more programs on his 390 bytes of memory. Regarding the price, in 1986 it is around 70.00 (around 200.00 today) , a small batch product with much more functionality the price is ok.

  • @frankfirst6863
    @frankfirst6863 Před 14 dny

    I keep clearing my throat when listening to you speak 😮

  • @DownHillgamer
    @DownHillgamer Před 14 dny

    Got an original from my grandpa. Gotta get new batteries today

  • @john_hind
    @john_hind Před 14 dny

    More capable hardware with less capable software! Swiss Micros do like to make it difficult to decide which version to buy! I really wish they would give some attention to making a multi-personality keypad. With minor design tweaks and a commitment to supply, it ought not to be that difficult. Make the key-tops exchangeable, add some overlay retention features and supply overlays and key-sets so the DM32 hardware can be converted to run DM41X or DM42 firmware comfortably. Enable third parties to make conversion kits for their own firmware such as Christophe's DB48X.

    • @N.A._McBee
      @N.A._McBee Před 14 dny

      Couldn't agree more!

    • @CalculatorCulture
      @CalculatorCulture Před 13 dny

      It is an interesting idea. When we buy a DM32 we are paying for the underlying hardware (both the platform and product specific hardware like the keys) and the software (both DMCP and the DM32 firmware). It’s possible to imagine alternative models where those are unbundled in different ways. Whether unbundling would be good commercially for SM is a matter of debate though. Probably better to discuss on the SM forums.

    • @john_hind
      @john_hind Před 13 dny

      @@CalculatorCulture I suppose it depends on the balance between how many people would buy more than one model and how many (like me) buy none because we keep going to the web site and being unable to make a decision! But maybe I'm weird: I have the same problem with Apple and they seem to be doing well enough without me! With me 'fear of choosing wrong' is a more powerful motivator than 'fear of missing out'! I have a feeling though it would be more profitable to sell calculator and conversion kits separately even if they insisted on a large markup on the conversion kits to cover software costs. Conversion kits could comprise keycaps, overlay and a printed manual.

    • @markusfischhaber8178
      @markusfischhaber8178 Před 13 dny

      The calculator is big disappointment. Very capable hardware but the restrictions applied are a letdown for me. Needs alternative firmware

    • @N.A._McBee
      @N.A._McBee Před 12 dny

      @@markusfischhaber8178 What do you mean by "the restrictions applied"?

  • @meccano-oz
    @meccano-oz Před 14 dny

    The 32sii is one of my favourites.

  • @threadripper979
    @threadripper979 Před 14 dny

    Let us know when they're going to make a DM48 - just one more row of keys and some programming that is already being developed by Christophe de Dinechin.

    • @CalculatorCulture
      @CalculatorCulture Před 13 dny

      Yeah there is no doubt a DM48 would be popular.

    • @valuemastery
      @valuemastery Před 13 dny

      That would be the one I'm definitely waiting for! Already having the DM42 and 41.

    • @DarcyParker22
      @DarcyParker22 Před 12 dny

      I would buy a DM48 right away without a second thought. My HP48GX from the mid 90s has some bad keys... and I miss it. I have an emulator on my phone... it works, it is faster than the original, but I miss using holding my HP48GX and using my thumbs to tap out calculations. It is my most favourite HP calculator. I have some other swiss micro calculators... but I am more in love with the HP48gx. I hope they put it on their road map. I imagine there are many working engineers like me who can afford it and would buy a swiss micro hp48.

    • @MartijnvanBuul
      @MartijnvanBuul Před 6 dny

      ​@@DarcyParker22 same here. My hp48 is failing, and the hp50 and hp prime i got to replace it just don't do it for me. The rpn mode on the prime seems an afterthought and doesn't do all that well. I could probably learn to live with the 50, but after having used a 48 for so long...

  • @JohnUsp
    @JohnUsp Před 14 dny

    Maybe installing DB48X would be better than the stock program.

    • @CalculatorCulture
      @CalculatorCulture Před 14 dny

      For those that like RPL yes you can load DB48X on it.

    • @valuemastery
      @valuemastery Před 13 dny

      @@CalculatorCultureGreat to know! Is that possible on other SwissMicros Devices as well?

    • @JohnUsp
      @JohnUsp Před 13 dny

      @@valuemastery DM42

  • @estebanvillalobos2303

    $280 is insane for this

    • @lowellmccormick6991
      @lowellmccormick6991 Před 13 dny

      I paid $200 for an HP32SII 10 years ago and $200 again 4 years ago after the previous 32SII was stolen. Even though I'm close to retirement I'm considering buying the Dm32. Just because.

    • @valuemastery
      @valuemastery Před 13 dny

      @@lowellmccormick6991For this reason, I still have another brand new, unopened DM32Sii here, just in case. Bought two of them when they were still made by HP.

    • @riendenboer6772
      @riendenboer6772 Před 13 dny

      Just figure out how many products you have to sell to actually make some money.. a totally different situation compared to the time every student or engineer needed one. It is a very decent price!

    • @enginerdy
      @enginerdy Před 10 dny

      Not at all. Go try to buy a professional pocket calculator now. You absolutely can’t.. the whole market is centered around SAT and other test restrictions or edu requirements. If you need a pocket calculator and a phone isn’t cutting it the DMs are great.

    • @javaman4584
      @javaman4584 Před 2 dny

      I paid $360 for an HP-45 in 1974. Fifty years later I still have it and it works like new. Have a look at some of the videos about the F77 keyboard based on the IBM model F and what it took to make it happen. Manufacturing is difficult and expensive, especially in small volumes.

  • @InssiAjaton
    @InssiAjaton Před 15 dny

    My first “calculators” were a pair of slide rulers, one 6” for pocket use, the other one 12” for desk use. Next I added a mechanical (Brunsviga), when I needed 10-digit addition and subtraction, which slide rules did not do. After that, I saw in HP Journal the article about HP 35 pocket calculator and ordered one. Took about 3 months to receive it, but boy - how marvelous it was! When the HP 67 was launched, I got that and donated the 35 to the company receptionist/secretary. Then, I think I got the more pocket friendly HP 11C. At some point I had to handle some binary, octal and hex numbers and added HP 16C. But two calculators in my pockets was not a good long term solution, so i next changed to HP 42S, which I still use to do my tax returns… However, I now have a 15C emulator on my iPad mini, my cell phone, my PC and my MacBook Pro. And, after the 67 card feeder rubber roll went all mushy, I got a 67 emulator for my MacBook Pro. Long live RPN!