DM42 (SwissMicros) - Solving Various Engineering Problems

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  • Опубліковано 22 гру 2024

КОМЕНТАРІ • 98

  • @west
    @west 3 роки тому +20

    Whoah, I was intrigued to see a DM42 video recommended, I didn't realize I'd get mentioned in it. Nice video!

    • @scottcollins7513
      @scottcollins7513  3 роки тому +7

      Thanks! Yes, I have definitely watched my fair share of your videos. Thanks for leaving a comment and for the good content you have shared on your channel.

  • @seanhunter111
    @seanhunter111 Рік тому +1

    Just got my DM42 and am learning lots of cool little things about it which have just been done very thoughtfully. For example, for your polar/rectangular conversions, as you showed, if you have two real numbers in X and Y and you do convert to polar or rectangular treats them as the two parts of a complex number and then does the conversion as you would expect. If you have a complex number in X (eg you had two real numbers in X and Y and hit "Complex" or got it by taking a negative square root or whatever), and do the conversion to polar or rectangular it will work just on the complex number in X.

    • @scottcollins7513
      @scottcollins7513  Рік тому +1

      There were geniuses at work at hp back in the day -- the hp 28, 48, and 42 are all amazing devices.

  • @johan0234523
    @johan0234523 4 роки тому +13

    Forgot to mention; the idea to preface solver programs with a dot is very clever! I immediately adopted that convention as well.

  • @Scanito
    @Scanito 2 роки тому +1

    Great video/reminder on how to solve different problems with the DM42… Thanks Scott!

    • @scottcollins7513
      @scottcollins7513  2 роки тому

      Appreciate you leaving a comment - glad you found it helpful. Take care, Scanito.

  • @gerardzi7930
    @gerardzi7930 4 роки тому +4

    another great video ! Free42 : An HP-42S Calculator Simulator for Linux, Android, IOS, Windows too

    • @scottcollins7513
      @scottcollins7513  4 роки тому +1

      Thanks for the encouragement. Good point about Free42. That’s actually what I used before deciding to buy the DM42.

    • @Crazytesseract
      @Crazytesseract 2 роки тому

      @@scottcollins7513 DM42 is based on Free42 code. Please thank Mr. Thomas Okken, and he'll be happy.

  • @wisdomandknowledge9361
    @wisdomandknowledge9361 3 роки тому +1

    I recently purchased a DM42 and this video was helpful in learning how to use it - thank you.

    • @scottcollins7513
      @scottcollins7513  3 роки тому

      Glad you found it helpful. Thanks for letting me know. Enjoy your DM42 -- it's a cool little calculator.

  • @harmongrier9167
    @harmongrier9167 4 роки тому

    Great video. Used along with Logan West's. Lost all my old programs due to a inadvertent buttons getting pressed while 42 was in briefcase. (Keep Button Side In lol). This was a great help in getting me up to speed again. Thanks!

    • @scottcollins7513
      @scottcollins7513  4 роки тому

      Glad it was helpful, Harmon. Thanks for letting me know! Cool that you have an original (presumably) 42S.

    • @blackshadowghoster01
      @blackshadowghoster01 3 роки тому +2

      I recommend backing up all files, states, off images etc. and keep a usb cable with you (in your briefcase). I use the DM42 daily at work and can connect to my work laptop without having IT involved.... I owned tons of calculators (graphing and scientific) and the DM42 is like my laptop, it goes wherever I go.

  • @Quantalume
    @Quantalume 3 роки тому +2

    Nice video. Watching this reminded me of one of the idiosyncrasies of the 42S that bothered me. When you are entering a complex number, you enter the magnitude first, then the angle. When you are entering a vector, it's the reverse.

    • @scottcollins7513
      @scottcollins7513  3 роки тому +2

      Thank you for the kind words. YES, I agree that the inconsistency is strange. Was not aware of the vector behavior you are describing, but I have run into the same thing when using CONVERT from rectangular to polar and vice versa.

    • @invictusdomini8624
      @invictusdomini8624 Рік тому +2

      It is because the stack is upside down (bottom-up). If the stack was the other direction (top-down) then the apparent inconsistency goes away.
      There may still feel like an inconsistency, but it's introduced by the COMPLEX function not following previously established input convention.

  • @chef1arjunaidi
    @chef1arjunaidi 4 роки тому +5

    Interesting video as usual. Although the DM42 has roots in the HP41 which I had may years ago, I find it difficult to follow the keystrokes. Entering matrix seems quite tedious, the solver is clunky. I guess I have been spoiled by graphing calculators like my current favourite, the HP Prime

    • @scottcollins7513
      @scottcollins7513  4 роки тому +6

      First, thank you for letting me know you found the video interesting.
      Following the keystrokes is made worse bc the DM has a setting for alpha mode that changes things up from the normal HP 42S (e.g. using shift-1 to enter 1). It’s a bit less intuitive, too, than the HP 28 and 48 in terms of when ENTER is required and when not, but that’s a minor quibble. Also, I’m going fast bc the video is already long enough. Wonder if I am striking the right balance?
      I disagree about matrix entry. I think it works well. I actually prefer entering matrix on this calc compared w the HP Prime, but the Prime has the big advantage of showing the contents of the matrix once entered (the DM42 does not).
      100% agree that the solve function is clunky compared w the Prime and 28/48 and the Casio 991EX and TI-36X Pro. It’s fine for entering something you know you’ll use again and again. But, for a quick, one time use it is too keystroke-intensive to want to use.

    • @EEhe-i7t
      @EEhe-i7t 4 місяці тому

      ​​@@scottcollins7513Its old calculator and it had one line display hence it can't do integrals,matrices, equations as elegantly as HP 48g

    • @scottcollins7513
      @scottcollins7513  4 місяці тому

      @@EEhe-i7t I find the hp 28 more intuitive (in part b/c it does less) than the 48, but agree that both are superior to the dm42 in the aspects you listed.

    • @EEhe-i7t
      @EEhe-i7t 4 місяці тому

      @@scottcollins7513HP 42s should have had integral solver like HP 48 and spreadsheet like matrices,but it can't because of its two line display.HP 48g/HP 50g are more suited for complex engineering work,Why dont make a video on HP 50g ?

  • @johan0234523
    @johan0234523 4 роки тому +1

    Very useful, and easy to follow! Thanks!

    • @scottcollins7513
      @scottcollins7513  4 роки тому

      Appreciate the encouraging comment -- good to know there are people out there who like this sort of thing.

  • @Robtmmartine77
    @Robtmmartine77 2 роки тому +1

    Thanks that was awesome, Finally learning how to use mine.

    • @scottcollins7513
      @scottcollins7513  2 роки тому +1

      Appreciate you saying so. Thanks for the encouraging words. The DM42 is superb.

  • @GeoCalifornian
    @GeoCalifornian 3 роки тому +2

    5:56 ...My hp 17bII+ solved the universal gravitation equation instantaneously-and without having to rearrange the equation; hp 17b solver is SO intuitive and easy!
    /hp solve

    • @scottcollins7513
      @scottcollins7513  3 роки тому +1

      DM42 is definitely not efficient in this regard -- my TI-36X PRO and CASIO fx-115ES 2nd ed are both much more intuitive. Thanks for the comment.

    • @GeoCalifornian
      @GeoCalifornian 3 роки тому

      @@scottcollins7513 ----Today, there are only two calcs that I really need, and for very specific reasons: the TI-36X Pro and the venerable hp 17bII+
      ..... The TI-36X Pro, because it saves enormous amounts of scrollable calculation/answer history, far more than Casio scientifics, and especially because no Casio even saves calculation history after power-down.
      ..... The hp 17bII+ because the Solver is out-of-this-world easy, intuitive, and when you key-in an equation, the hp 17 instantly creates elegant soft menus at the bottom of the LCD of all the variables in the equation; so beautiful!
      ..... Furthermore, the hp 17bII+ ensures that any equation you key-in is mathematically valid before you attempt to solve it. So handy! ...I keyed-in the complex Colebrook-White equation for determining the friction factor in a pipe carrying water. Colebrook-White equation is an implicit equation such that it has the friction factor variable "f" on BOTH sides of the equation. But my hp 17bII+ handled it with engineering agility, --this in a compact shirt-pocket sized calculator the way God intended!
      /Silicon Valley Regards

    • @scottcollins7513
      @scottcollins7513  3 роки тому

      @@GeoCalifornian I just made a video today showing the way TI-36X Pro excels in handling past expressions and results, making them easily accessible for subsequent usage AND keeping them when you power off or switch modes (here's a link in case any one is curious: ua-cam.com/video/beUZrvdnPG8/v-deo.html).
      As for the hp 17bII+, I've never used it, but what you are describing and from what I can see in images of the calculator, it sounds very similar to the approach used w/ the hp 28S and 48GX. What's subtle, but great about the approach is that you can make in-between calculations and then save those to the variables as you go. Agree that it is very intuitive.
      Thanks for the Silicon Valley Regards... next time please send some of the weather -- tired of snow/cold in my part of the US!

    • @GeoCalifornian
      @GeoCalifornian 3 роки тому

      @@scottcollins7513 ----Scott I will check out your newest TI-36X Pro video!
      .... In the meantime, I witnessed the engineering prowess of my pocket hp 17bII+ by solving the Colebrook-White equation for friction factor in a pipe.
      /hp solve

    • @scottcollins7513
      @scottcollins7513  3 роки тому +1

      @@GeoCalifornian Just looked that equation up. That's a bit of a beast (flashback to fluid mechanics). Cool that the 17bII+ solves it with ease. I may have to give that one a try on the lesser calculators to see if they can handle it.

  • @cylurian
    @cylurian 2 місяці тому

    When I program this on my 42, I get a DUP, do you have your flag 11 off or something else, so it will not appear? thx.

    • @scottcollins7513
      @scottcollins7513  2 місяці тому

      It's been a long while since I made that video so I need a little more info. Are you trying to program QUAD (to find roots of a quadratic)?

  • @stevebjee
    @stevebjee Рік тому

    My HP48GX died earlier this year and I got the SwissMicros DM42 to use as a replacement. The 48GX was awesome.

    • @scottcollins7513
      @scottcollins7513  Рік тому

      The display and simplicity of the DM42 (and the hp 42S) are both advantages, but it is no 48GX. It really depends what you use it for. For me, the DM42 is better. But, I've been thinking I might give my old hp 28S another whirl.

    • @stevebjee
      @stevebjee Рік тому +1

      @@scottcollins7513 My HP 48GX was most useful for matrix operations solving a system of equations, but where it really rocked was phasors for AC circuit analysis

    • @scottcollins7513
      @scottcollins7513  Рік тому +1

      @@stevebjee I understand the matrix operations bit, but have no experience w/ the AC circuit analysis (phasors). 48GX is great w/ matrices and vectors -- better than DM42. If you really miss your 48GX, you might explore either buying a used one (they are quite pricey generally) *or* investigate some of the people who are modifying their DM42 to become a 48 as I understand. There was a Droid48 app for android that worked well -- but you'll miss the awesome keyboard of the 48. One other idea would be to get an old 28S which is like a 48GX "lite" - costs significantly less and better display than 48, but also very old at this point - they are out there, though.

    • @batracio2
      @batracio2 7 місяців тому

      ​@@scottcollins7513o comprar una hp 50G de segunda mano.
      la hp 48GX, es muy buena (yo tengo una), sobre todo el teclado ; pero la hp 50G, está 3 pasos arriba, y lo mejor no te costará nada acostumbrarte a ella.

    • @christophe3d
      @christophe3d 2 місяці тому

      It might interest you to install DB48X on your DM42.

  • @billhennessy5118
    @billhennessy5118 3 роки тому

    I need a Degrees, Minutes & Seconds button this calculator does not seem to have one. Is it in a menu someplace? Can it be called up quickly?

    • @scottcollins7513
      @scottcollins7513  3 роки тому

      Hi, Bill. It does have the function that's easily accessed. Look under "CONVERT" menu. The only weird bit is that, for example, 12 deg 34 min 56 sec is entered as 12.3456.

    • @l353a1
      @l353a1 3 місяці тому

      @@scottcollins7513 Thanks for that. I use those functions quite a bit but I have always found them from CATALOG then FCN.

  • @aab-el9bd
    @aab-el9bd Рік тому

    i cannot update it, and now it is stuck in the bootloader screen, even when I reset and/or remove the battery.

    • @scottcollins7513
      @scottcollins7513  Рік тому

      Reach out to SwissMicros. They are small enough to actually help out customers.

    • @aab-el9bd
      @aab-el9bd Рік тому

      @@scottcollins7513
      they are not answering

  • @julioc4978
    @julioc4978 3 роки тому

    Are they keys stiff or they are comparable to the 48GX? I saw in other videos that the keys were stiff?
    Cheers

    • @scottcollins7513
      @scottcollins7513  3 роки тому

      They feel fine to me and not too stiff. There was a design improvement that happened right around the time mine was purchased - but, I’m not sure if I have the new and improved keyboard (probably) or the original. That said, the keys on my HP48GX and HP28S are somewhat better.

  • @HAL_9000_YT
    @HAL_9000_YT 9 місяців тому

    Hi, it is possible to add grades, minutes and seconds?

    • @scottcollins7513
      @scottcollins7513  9 місяців тому +1

      Your speaking of gradians (e.g. 50 gradians = 45 degrees)? Regardless, I believe you would have to write a program to do that, but it would be relatively simple and you would only have to select that program (function) any time you wanted to do the conversion.

  • @jaycarlson2579
    @jaycarlson2579 3 роки тому

    Any chance of doing this with the DM41X?

    • @scottcollins7513
      @scottcollins7513  3 роки тому

      I do not own that calculator (DM's are nice but they are not cheap!). Perhaps Logan West would be willing to put it together -- his channel is at ua-cam.com/users/loganswest

  • @razeliezerbenmoshe8052
    @razeliezerbenmoshe8052 Рік тому

    Is it a graphing calculator?

    • @scottcollins7513
      @scottcollins7513  Рік тому +1

      It is not. There may be some special programs that allow it to graph, but it is/was not designed as a graphing calculator.

  • @toming1834
    @toming1834 2 роки тому

    Where can I buy it?

    • @scottcollins7513
      @scottcollins7513  2 роки тому

      I bought mine directly from SwissMicros (www.swissmicros.com/). I think that is the only way in US to buy new.

  • @GeoCalifornian
    @GeoCalifornian 4 роки тому +1

    2:33 "Hopefully you can visualize that" ... No I can't, without writing the rearranged equation down on paper... the solver on the HP17BII is more intuitive in this regard.

    • @scottcollins7513
      @scottcollins7513  4 роки тому +2

      Agree -- RPN takes some getting used to, and even then, it's more intuitive to use a solver that allows you to type in the equation exactly as it appears on your paper and then solve for the variable of your choice. Casio fx-991EX and TI-36X Pro are both strong at this.

    • @GeoCalifornian
      @GeoCalifornian 4 роки тому

      @@scottcollins7513 --I am bidding on an HP17BII right now... the Solver function is so functional for engineers, contractors, nurses, et al... I don't know how I missed it all these years...
      ...Take a look at how elegant and intuitive it is:
      (Variables in your equation are shown on the soft menu, and any variable can be solved WITHOUT the need to rearrange the equation; simple and elegant!)
      Just scroll over to the 1 1 : 5 5 minute in the video for the fun to begin...
      ua-cam.com/video/fVO6HoT2pCE/v-deo.html
      /Silicon Valley Regards

    • @scottcollins7513
      @scottcollins7513  4 роки тому

      @@GeoCalifornian Agree that it is a better approach. The HP28S and 48GX have the same general sort of solvers.

  • @carloscm1323
    @carloscm1323 3 роки тому +1

    Nice handwriting too!

    • @jenselstner5527
      @jenselstner5527 Рік тому

      The handwriting tool was a Version 1 reMarkable. The Version 2 has a better casing, rest is the same.

  • @tallswede80
    @tallswede80 2 роки тому

    the 42 is excellent for finding roots. you are supposed to use the solver, which you didn't use.

    • @scottcollins7513
      @scottcollins7513  2 роки тому

      Correct me if I'm misunderstanding you, but the solver is good for finding a single root, but to find the other roots requires knowing where to look for them -- in other words, you have to provide the 42 with a starting point from which to iterate.

    • @tallswede80
      @tallswede80 2 роки тому

      @@scottcollins7513
      Yes, correct. I have not used the other brand you mentioned, but I assume it finds all the roots at the same time? I guess that might be better in a classroom environment.

    • @scottcollins7513
      @scottcollins7513  2 роки тому +1

      @@tallswede80 Yes, as you correctly stated, there are other calculators that will just give the various roots at the same time which is great for a math class.

    • @tallswede80
      @tallswede80 2 роки тому

      @@scottcollins7513
      Then again, classroom environment is artificial, so it is a mistake to design tools that are only to be used inside a classroom. Ultimately the classroom is a means to an end, but teachers these days act like it is an end in itself.

    • @scottcollins7513
      @scottcollins7513  2 роки тому

      @@tallswede80 In defense of teachers, they are told "you will teach to these standards" which removes so much flexibility from the process. 100% agree that teaching is meant to equip, not to be an end in and of itself.

  • @viscourtroy
    @viscourtroy 4 місяці тому

    😫😫 The RPN input is so hard, ... (I am a Casio Sci-Calculators users) I am old and I learn slowly now...

    • @scottcollins7513
      @scottcollins7513  4 місяці тому +1

      Hang in there. You may not end up liking it better in the end, but you definitely need to put in enough time til the approach "clicks" for you. Then you can make a decision on whether or not RPN is for you. Good for you for trying something new! Good for your mind, too.

    • @Quidisi
      @Quidisi 2 місяці тому

      I'm old now too, but I was fortunate to have been introduced to RPN in junior high school (13 years old) and today I can seamlessly switch between RPN, or non-RPN calculators.
      There is something about RPN entry that makes me happy. It's strange, but it brings a bit of joy.
      You should consider it a nice challenge - keep the old brain firing on all cylinders by forcing it to learn a new thing :)
      Good luck to you.

    • @scottcollins7513
      @scottcollins7513  2 місяці тому

      @@Quidisi Agree w/ the "brings a bit of joy". There is something to it, b/c I think that is a shared sentiment among a lot of RPN users. There is a text editor called VIM and it has the same sort of magic when compared w/ a standard text editor (like notepad), though both have their places and use cases.

    • @Quidisi
      @Quidisi 2 місяці тому

      @@scottcollins7513 I'll have to check out VIM. I use Mac at home, but Windows at work, and at work I use NotePad++
      The other thing I use and love on both Mac and Windows, is Obsidian. For serious notes, it's awesome.

  • @robertdick954
    @robertdick954 Рік тому

    Why don't you mention that it cannot communicate with a computer because the USB port is defective on the calculator!

    • @scottcollins7513
      @scottcollins7513  Рік тому

      Mine works. I have both exported and imported programs via USB.

  • @leo.girardi
    @leo.girardi Рік тому

    In what way would a 48 "blow this away"?

    • @scottcollins7513
      @scottcollins7513  Рік тому +2

      First, know that I really like the DM42 and appreciate its overall simplicity (and superb display).
      Some things the 48 offers that the 42 does not:
      - Infinite stack
      - Full-blown directory structure (you can organize all your programs by topic, etc.)
      - Solver - super powerful and easy to use - can embed/nest formulas within formulas
      - Units and Unit Conversions (as complex as you want, it can handle them)
      - Vectors that you can work directly with - 42 can do similar ops, but the 48 is simpler

    • @leo.girardi
      @leo.girardi Рік тому +1

      @@scottcollins7513 Thx for the follow up.

    • @EEhe-i7t
      @EEhe-i7t 4 місяці тому

      @@scottcollins7513 DM 42 is great for number crunching,but clumsier for doing integrals,matrices etc

    • @scottcollins7513
      @scottcollins7513  4 місяці тому

      @@EEhe-i7t Agreed. Also, the solver is clumsier than hp28/hp48.

    • @EEhe-i7t
      @EEhe-i7t 4 місяці тому

      Yes

  • @johnl2727
    @johnl2727 Рік тому +1

    The 27S solver is sooooooo much faster and easier than the 42.

    • @scottcollins7513
      @scottcollins7513  Рік тому +1

      I loved the hp 28s solver, too. Definitely better than the 42s.

  • @gvi341984
    @gvi341984 Рік тому

    I hate this calculator because why would you put pi as a second option

    • @scottcollins7513
      @scottcollins7513  Рік тому +4

      Probably b/c its designers regard pi as highly irrational.

    • @gvi341984
      @gvi341984 Рік тому

      @@scottcollins7513 Casio has the same issue as well and some HP models. For a frequently used button the second shift is an insult

    • @scottcollins7513
      @scottcollins7513  Рік тому

      @@gvi341984 It does seem like there is always some design decision that makes us scratch our heads. I have never minded pi being shifted function, but I would if I did a lot of work w/ it (one cool thing about the 42 is that you can write little programs -- to compute the area of a circle for example). Even the TI-30X Pro Mathprint has factorial as a primary key, but square root as a shifted function. But, the layout of the keyboard is very logical. I'm sure there is a lot of debate going on when these devices are getting designed. And, it is one of those things where you are never going to make everyone happy.

    • @gvi341984
      @gvi341984 Рік тому +1

      @@scottcollins7513 Shift function doesn't make sense for root and pi since they are used so often.

    • @odarge
      @odarge Рік тому

      @@gvi341984 this is your feeling. Many people will find this design really equilibrated. I do ;-) (I do own Prime , 48GX, 28s, even a Casio 991EX oops!) I really like this DM42 even if it's not perfect)

  • @bonjournito
    @bonjournito 2 місяці тому

    400 CAD??!!! Really??!!! What are they thinking?!!😂

    • @scottcollins7513
      @scottcollins7513  2 місяці тому

      @@bonjournito It is definitely expensive - a luxury item. In real dollars, it is probably similar to what it sold for new in the early 1990s. Not sure bc I could not find original MSRP. But, when compared to other modern programmable calculators it is pricey. Also, the currency exchange rate will also cause fluctuations in price.